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Index: D

• configuration command
• • sendmail, 5.3.2. Macros
  • sendmail, 7.1. Overview
  • sendmail, 31.3. Configuration File Definitions
• flag : sendmail, 30.8. Alphabetized F= Flags
• flag
• • sendmail, 14.2.2. The Date: Header
  • sendmail, 30.8. Alphabetized F= Flags
• line (host status file) : sendmail, B.1. Status file lines
• line (qf file) : sendmail, 23.9. The qf File Internals
• $d macro : sendmail, 31.10. Alphabetized Reference
• option : (see DeliveryMode (d) option)
• option : (see AutoRebuildAliases (D) option)
• rule-testing command : sendmail, 38.2.1. Define a Macro with .D
• -d switch (makemap) : sendmail, 33.2.1.1. -d allow duplicate keys
• -d switch (sendmail)
• • sendmail, 4.3. Debugging (-d)
  • sendmail, 36.7. Alphabetized Reference
  • sendmail, 37.1. The Syntax of -d
  • complete list of switches : sendmail, 37.5. Reference in Numerical Order
  • -d0.1 switch
  • • sendmail, 7.3.1. The hostname
    • sendmail, 11.6. Handling user@thishost
    • sendmail, 37.5. Reference in Numerical Order
  • -d0.15 switch
  • • sendmail, 6.3.3. Testing the New Delivery Agent Definitions
    • sendmail, 37.5. Reference in Numerical Order
  • -d0.4 switch
  • • sendmail, 31.7.1. Macros and the System Identity
    • sendmail, 37.5. Reference in Numerical Order
  • -d21.12 switch
  • • sendmail, 10.5. Details of Rule Flow
    • sendmail, 37.5. Reference in Numerical Order
  • -d35.9 switch
  • • sendmail, 7.3. Predefined Macros
    • sendmail, 37.5. Reference in Numerical Order
  • -d37.1 switch
  • • sendmail, 13.3. Testing the Options
    • sendmail, 37.5. Reference in Numerical Order
  • with rule testing : sendmail, 38.7. Add Debugging for Detail
• D= equate : sendmail, 30.4. The Equates
• DAC (Discretionary Access Controls) : Practical UNIX & Internet Security, 4.1.3. Groups and Group Identifiers (GIDs)
• daemon
• • TCP/IP Network Administration, 3.2. The Host Table
  • TCP/IP Network Administration, 5.4. The Internet Daemon
  • options for : sendmail, 34.8. Alphabetized Reference
  • preventing from running : sendmail, 15.5. Prevent the Daemon from Running
  • privacy of : sendmail, 34.8. Alphabetized Reference
  • signals : sendmail, 26.3. Signaling the Daemon
  • tools for : Building Internet Firewalls, B.5. Daemons
  • user
  • • Practical UNIX & Internet Security, 4.1. Users and Groups
    • sendmail, 14.6. Trusted User
    • TCP/IP Network Administration, 5.4. The Internet Daemon
• daemon mode
• • sendmail, 3.4. Role as a Daemon
  • sendmail, 4.1.1. Daemon Mode (-bd)
  • sendmail, 36.7. Alphabetized Reference
• DaemonPortOptions (O) option : sendmail, 34.8. Alphabetized Reference
• damage, liability for : Practical UNIX & Internet Security, 26.4.6. Liability for Damage
• "dangerous write permissions" warning : sendmail, 22.5.1. Dangerous Write Permissions
• dash (hyphen)
• • in machine conversation : sendmail, 4.2. Verbose (-v)
  • non-equivalent host : TCP/IP Network Administration, 12.2.5. Secure the r Commands
• DAT (Digital Audio Tape) : Practical UNIX & Internet Security, 7.1.4. Guarding Against Media Failure
• data : Building Internet Firewalls, 1.1.1. Your Data
• • assigning owners to : Practical UNIX & Internet Security, 2.4.4.1. Assign an owner
  • availability of : Practical UNIX & Internet Security, 2.1. Planning Your Security Needs
  • communication equipment (DCE) : Practical UNIX & Internet Security, 14.3. The RS-232 Serial Protocol
  • communications model : TCP/IP Network Administration, 1.2. A Data Communications Model
  • communications protocols : (see TCP/IP services)
  • compression, not provided in SLIP : TCP/IP Network Administration, 6.2.1. The Serial Protocols
  • confidential
  • • Practical UNIX & Internet Security, 2.1. Planning Your Security Needs
    • Practical UNIX & Internet Security, 2.5.2. Confidential Information
  • disclosure of : Practical UNIX & Internet Security, 11.2. Damage
  • DNS
  • • Building Internet Firewalls, 8.10.3. DNS Data
    • Building Internet Firewalls, 8.10.4.2. Mismatched data between the hostname
  • espionage
  • • Building Internet Firewalls, 1.2.2.4. Spies (Industrial and
    • Practical UNIX & Internet Security, 11.3. Authors
  • giving away with NIS : Practical UNIX & Internet Security, 19.4.5. Unintended Disclosure of Site Information with NIS
  • identifying assets : Practical UNIX & Internet Security, 2.2.1.1. Identifying assets
  • protecting from sniffers : Building Internet Firewalls, 10.1.2. Packet Sniffing
  • spoofing : Practical UNIX & Internet Security, 16.3. IP Security
  • terminal equipment (DTE) : Practical UNIX & Internet Security, 14.3. The RS-232 Serial Protocol
  • theft of : (see information, theft and espionage)
  • transferring
  • • Building Internet Firewalls, 6. Packet Filtering
    • (see email; files, transferring)
    • allowing/disallowing : Building Internet Firewalls, 6.1. Why Packet Filtering?
    • via TCP : Building Internet Firewalls, 6.3.3.1. TCP
  • user-specified, and proxying : Building Internet Firewalls, 7.4.4. User-Specified Data
• Data Carrier Detect (DCD) : Practical UNIX & Internet Security, 14.3. The RS-232 Serial Protocol
• DATA command, in SMTP : TCP/IP Network Administration, 3.4.1. Simple Mail Transfer Protocol
• Data Defense Network (DDN) : Practical UNIX & Internet Security, F.3.4.20. MILNET
• Data Encryption Standard : (see DES)
• DATA keyword : sendmail, 4.2. Verbose (-v)
• Data Link Layer
• • TCP/IP Network Administration, 1.2. A Data Communications Model
  • TCP/IP Network Administration, 5.3.1.2. Pseudo-device
  • TCP/IP Network Administration, 6.1.1. Determining the Interface Name
  • in PPP : TCP/IP Network Administration, 6.2.1. The Serial Protocols
• Data Set Ready (DSR) : Practical UNIX & Internet Security, 14.3. The RS-232 Serial Protocol
• Data Terminal Ready (DTR)
• • Practical UNIX & Internet Security, 14.3. The RS-232 Serial Protocol
  • TCP/IP Network Administration, A.2. The PPP Daemon
• data terminology : TCP/IP Network Administration, 1.3. TCP/IP Protocol Architecture
• data-driven attacks : Building Internet Firewalls, 8.1. Electronic Mail
• database files : Practical UNIX & Internet Security, 1.2. What Is an Operating System?
• database macros : sendmail, 33. Database Macros
• databases : (see networks and networking, databases, network)
• • classes for : sendmail, 33.8. Alphabetized Reference
  • external (keyed)
  • • sendmail, 5.3.11. Keyed Databases
    • sendmail, 20.3. Alphabetized V8.8 Subroutines
  • K command types : sendmail, 33.3.2. The class
  • library support : sendmail, 18.4.1. DBMDEF=
  • m4 and : sendmail, 33.6. Database Maps and m4
  • /map rule-testing command : sendmail, 38.5.3. Look up a Database Item with /map
  • sendmail : TCP/IP Network Administration, 10.6.2.1. Transforming with a database
  • User Database
  • • sendmail, 33.5. The User Database
    • sendmail, 33.8. Alphabetized Reference
    • sendmail, 34.8. Alphabetized Reference
• datagrams
• • Building Internet Firewalls, C.5.1.1. The datagram
  • TCP/IP Network Administration, 1.3. TCP/IP Protocol Architecture
  • TCP/IP Network Administration, 1.5.1.1. The datagram
  • TCP/IP Network Administration, 1.7. Application Layer
  • (see also IP datagrams)
  • (see also User Datagram Protocol)
  • connectionless delivery of : TCP/IP Network Administration, 1.6. Transport Layer
  • converting source address of : TCP/IP Network Administration, 4.2.1. Obtaining an IP Address
  • forwarding : TCP/IP Network Administration, 5.3.1.1. Options
  • fragmented
  • • Building Internet Firewalls, C.5.1.3. Fragmenting datagrams
    • TCP/IP Network Administration, 1.5.1.3. Fragmenting datagrams
    • TCP/IP Network Administration, 5.2. Linux Kernel Configuration
  • headers
  • • TCP/IP Network Administration, 2.7.1. Protocol Numbers
    • TCP/IP Network Administration, 2.7.2. Port Numbers
  • marking end of : TCP/IP Network Administration, 6.2.1. The Serial Protocols
  • routing : TCP/IP Network Administration, 1.5.1.2. Routing datagrams
  • silently discarding : TCP/IP Network Administration, 11.8. Protocol Case Study
• date : (see time and date)
• date command
• • Practical UNIX & Internet Security, 8.1.3. Accounts That Run a Single Command
  • Practical UNIX & Internet Security, 24.5.1. Never Trust Anything Except Hardcopy
• "Date:" header line
• • sendmail, 1.5. The Header
  • sendmail, 14.2.2. The Date: Header
  • sendmail, 30.8. Alphabetized F= Flags
  • sendmail, 35.10. Alphabetized Reference
• day-zero backups : Practical UNIX & Internet Security, 7.1.3. Types of Backups
• db library package
• • sendmail, 2.4.1. Eliminate or Keep db Support?
  • sendmail, 18.8. Alphabetized Reference
  • sendmail, C.1. Overview
  • compiling and installing : sendmail, C.3. Compile and Install
• dbm database : sendmail, 33.8. Alphabetized Reference
• • alias file and
  • • sendmail, 22.6.1. The Alias Database Files
    • sendmail, 24.5. The Aliases Database
• dbx debugger : Practical UNIX & Internet Security, C.4. The kill Command
• DCC (Direct Client Connections) : Building Internet Firewalls, 8.9.2. Internet Relay Chat
• DCD (Data Carrier Detect) modem control line : TCP/IP Network Administration, A.2. The PPP Daemon
• DCE (data communication equipment) : Practical UNIX & Internet Security, 14.3. The RS-232 Serial Protocol
• DCE (Distributed Computing Environment)
• • Practical UNIX & Internet Security, 3.2.2. The /etc/passwd File
  • Practical UNIX & Internet Security, 8.7.3. Code Books
  • Practical UNIX & Internet Security, 16.2.6.2. Other naming services
  • Practical UNIX & Internet Security, 19.2. Sun's Remote Procedure Call (RPC)
  • Practical UNIX & Internet Security, 19.7.1. DCE
• dd command
• • Practical UNIX & Internet Security, 6.6.1.2. Ways of improving the security of crypt
  • Practical UNIX & Internet Security, 7.4.1. Simple Local Copies
• DDN (Data Defense Network)
• • Building Internet Firewalls, C.10. Internet Routing Architecture
  • Practical UNIX & Internet Security, F.3.4.20. MILNET
  • TCP/IP Network Administration, 12.1.2.2. Use mailing lists to distribute information
  • Protocol tutorial : TCP/IP Network Administration, 1.3. TCP/IP Protocol Architecture
• deadlock : Practical UNIX & Internet Security, 23.2. Tips on Avoiding Security-related Bugs
• debug command
• • Practical UNIX & Internet Security, 17.3.4.2. Using sendmail to receive email
  • sendmail, 22.3.1. SMTP debug
• debug_dumpstate rule set : sendmail, 26.3.3.3. -- ruleset debug_dumpstate returns stat ..., pv: --
• debugfs command : Practical UNIX & Internet Security, 25.2.2.8. Tree-structure attacks
• debugging
• • Building Internet Firewalls, 6.1.2.1. Current filtering tools are not perfect
  • sendmail, 4.3. Debugging (-d)
  • sendmail, 6.3.3. Testing the New Delivery Agent Definitions
  • sendmail, 37.2. Debugging Behavior
  • TCP/IP Network Administration, 8.2.1. The Resolver Configuration File
  • TCP/IP Network Administration, C.1.1. Signal Processing
  • (see also bugs)
  • (see also -d switch (sendmail))
  • (see also testing)
  • (see also troubleshooting)
  • operating system : Building Internet Firewalls, 5.8.1.2. Fix all known system bugs
  • with rule testing : sendmail, 38.7. Add Debugging for Detail
  • SMTPDEBUG macro
  • • sendmail, 18.8. Alphabetized Reference
    • sendmail, 22.3.1. SMTP debug
• debugging mode : sendmail, 36.7. Alphabetized Reference
• DEC (Digital Equipment Corporation) : Practical UNIX & Internet Security, F.3.4.9. DEC (Digital Equipment Corporation)
• decentralizing management : TCP/IP Network Administration, 2.3. Subnets
• declaring
• • classes
  • • sendmail, 12.1.1. Declaring a Class
    • sendmail, 32.1. Class Configuration Commands
  • delivery agents : sendmail, 19.3.2. MAILER()
  • macros
  • • sendmail, 7.2. Defining Macros
    • sendmail, 31.2. Command-Line Definitions
  • sites for SITECONFIG : sendmail, 19.6. Alphabetized m4 Macros
  • trusted users : (see configuration command)
• DECnet network
• • Practical UNIX & Internet Security, 16.4.3. DECnet
  • sendmail, 3.3.3. Other Protocols
  • $C macro : sendmail, 31.10. Alphabetized Reference
• DECNET-RELAY macro (m4) : sendmail, 19.6. Alphabetized m4 Macros
• decode alias
• • Practical UNIX & Internet Security, 17.3.4.2. Using sendmail to receive email
  • sendmail, 22.6. The Aliases File
• decryption
• • TCP/IP Network Administration, 12.6. Encryption
  • (see encryption)
• dedicated connections
• • TCP/IP Network Administration, 6.3.1. The PPP Daemon
  • TCP/IP Network Administration, 6.4. Installing SLIP
• dedicated proxy servers : Building Internet Firewalls, 7.3.2. Generic Versus Dedicated Proxies
• defamation : Practical UNIX & Internet Security, 26.4.7. Harassment, Threatening Communication, and Defamation
• default
• • accounts : Practical UNIX & Internet Security, 8.1.2. Default Accounts
  • canonicalization : sendmail, 28.6.6.2. Default in canonicalization: $:
  • character set : sendmail, 30.4. The Equates
  • content-type character set : sendmail, 34.8. Alphabetized Reference
  • database key : sendmail, 33.4.1. Specify a Default with $:
  • delivery agent : sendmail, 34.8. Alphabetized Reference
  • delivery mode : sendmail, 13.2.3. The Default Delivery Mode
  • deny : Practical UNIX & Internet Security, 21.1.1. Default Permit vs. Default Deny
  • domain
  • • Practical UNIX & Internet Security, 16.2.3. Hostnames
    • TCP/IP Network Administration, 3.3.3. Domain Names
    • TCP/IP Network Administration, 8.2.1. The Resolver Configuration File
    • how used : TCP/IP Network Administration, 3.3.3. Domain Names
  • file permissions : sendmail, 13.2.4. The Default File Permissions
  • gateway
  • • TCP/IP Network Administration, 2.5. The Routing Table
    • TCP/IP Network Administration, 4.3. Planning Routing
    • address : TCP/IP Network Administration, 4. Getting Started
  • hostname : sendmail, 33.5.3. A :default Outgoing Hostname
  • logging level : sendmail, 13.2.6. The Default Logging Level
  • macro definitions : sendmail, 7.3. Predefined Macros
  • mask : TCP/IP Network Administration, 2.2.2. Classless IP Addresses
  • passwords : TCP/IP Network Administration, 12.2. User Authentication
  • permit : Practical UNIX & Internet Security, 21.1.1. Default Permit vs. Default Deny
  • route
  • • TCP/IP Network Administration, 2.2.2.1. Final notes on IP addresses
    • TCP/IP Network Administration, 2.5. The Routing Table
    • TCP/IP Network Administration, 7.3. Building a Static Routing Table
    • defining : TCP/IP Network Administration, 7.4.1.1. Running RIP with routed
  • sender's address format : sendmail, 31.10. Alphabetized Reference
  • User Database location : sendmail, 18.8. Alphabetized Reference
  • user identity
  • • sendmail, 13.2.5. The Default User Identities
    • sendmail, 22.8.3.1. The DefaultUser option
    • sendmail, 34.8. Alphabetized Reference
  • values : TCP/IP Network Administration, 3.6.1. Dynamic Host Configuration Protocol
• default deny stance
• • Building Internet Firewalls, 3.5.1. Default Deny Stance: That Which Is Not
  • Building Internet Firewalls, 6.2.3. Default Permit Versus Default Deny
• default permit stance
• • Building Internet Firewalls, 3.5.2. Default Permit Stance: That Which Is
  • Building Internet Firewalls, 6.2.3. Default Permit Versus Default Deny
• DefaultCharSet option : sendmail, 34.8. Alphabetized Reference
• defaultdomain file : TCP/IP Network Administration, 9.3. Network Information Service
• defaultroute option : TCP/IP Network Administration, 6.3.1. The PPP Daemon
• DefaultUser (u,g) option
• • sendmail, 13.2.5. The Default User Identities
  • sendmail, 22.8.3.1. The DefaultUser option
  • sendmail, 34.8. Alphabetized Reference
• Defense Communications Agency (DCA) : TCP/IP Network Administration, 1.1. TCP/IP and the Internet
• Defense Data Network (DDN) : Building Internet Firewalls, C.10. Internet Routing Architecture
• defense in depth
• • Building Internet Firewalls, 3.2. Defense in Depth
  • Building Internet Firewalls, 9.2.3.2. Defense in depth
• define() : sendmail, 20.3. Alphabetized V8.8 Subroutines
• define macro (in sendmail)
• • TCP/IP Network Administration, E.3. m4 sendmail Macros
  • TCP/IP Network Administration, E.3.1. define
• define statements (m4)
• • sendmail, 19.1. The m4 Preprocessor
  • sendmail, 19.4.1. Options
• defining
• • headers : (see configuration command)
  • macros
  • • sendmail, 20.3. Alphabetized V8.8 Subroutines
    • sendmail, 34.8. Alphabetized Reference
    • sendmail, 36.7. Alphabetized Reference
    • sendmail, 38.2.1. Define a Macro with .D
• definition statements (in gated) : TCP/IP Network Administration, B.7. Definition Statements
• delay= equate (syslog output) : sendmail, 26.1.3.2. delay= total time to deliver
• delay, transaction : sendmail, 26.1.3.13. xdelay= transaction
• delays, inserting
• • TCP/IP Network Administration, 6.3.2. Dial-Up PPP
  • TCP/IP Network Administration, 6.4.4. Troubleshooting Serial Connections
• DELETE key : Practical UNIX & Internet Security, 3.4. Changing Your Password
• deleting
• • destructive attack via : Practical UNIX & Internet Security, 25.1. Destructive Attacks
  • files : Practical UNIX & Internet Security, 5.4. Using Directory Permissions
  • header lines : sendmail, 20.3. Alphabetized V8.8 Subroutines
• delimiters
• • database key column : sendmail, 33.3.4.12. -z specify the column delimiter (V8.7 and above)
  • tokens
  • • sendmail, 31.10. Alphabetized Reference
    • sendmail, 34.8. Alphabetized Reference
• "Delivered-To:" header line : sendmail, 35.10. Alphabetized Reference
• delivermail program : sendmail, History
• delivery
• • sendmail, 19.6. Alphabetized m4 Macros
  • (see also users)
  • alias, forms of : sendmail, 24.2. Forms of Alias Delivery
  • failure count : sendmail, 23.9. The qf File Internals
  • via FAX machine : sendmail, 3.3.3. Other Protocols
  • to files : (see appending to files)
  • local
  • • sendmail, 3.2. Role in Local Delivery
    • sendmail, 29.6.3. Delivering to Local Recipient
    • sendmail, 30.8. Alphabetized F= Flags
    • (see local)
  • looking up addresses with DNS : sendmail, 21.2.3. Look Up Addresses for Delivery
  • to mailbox : sendmail, 3.2.1. Delivery to a Mailbox
  • to multiple recipients : sendmail, 30.8. Alphabetized F= Flags
  • path of : (see "Received:" header line)
  • precedence : (see priority, message)
  • to programs
  • • sendmail, 3.2.2. Delivery Through a Program
    • sendmail, 24.2.3. Delivery via Programs
    • sendmail, 25.7.4. Piping Through Programs
    • sendmail, 30.8. Alphabetized F= Flags
  • relays : (see relays)
  • single threaded : sendmail, 34.8. Alphabetized Reference
  • total time for : sendmail, 26.1.3.2. delay= total time to deliver
• delivery agents (MTAs)
• • Building Internet Firewalls, 8.1. Electronic Mail
  • sendmail, 1.1. MUA Versus MTA
  • sendmail, 5.3.1. Mail Delivery Agents
  • sendmail, 6.2. Define a Mail Delivery Agent
  • sendmail, 30. Delivery Agents
  • (see also configuration command)
  • $# operator and
  • • sendmail, 9.2.1. The Delivery Agent ($#)
    • sendmail, 28.6.5. Specify a Delivery Agent: $#
  • advantages to sendmail : sendmail, 18.1. To Use or Not to Use
  • choosing
  • • sendmail, 9. Rule Set 0
    • sendmail, 9.5. Things to Try
  • declaring : sendmail, 19.3.2. MAILER()
  • default : sendmail, 34.8. Alphabetized Reference
  • equates for : sendmail, 30.4. The Equates
  • for errors : sendmail, 9.4. The error Delivery Agent
  • expensive
  • • sendmail, 23.6.1. Periodically with -q
    • sendmail, 30.8. Alphabetized F= Flags
    • sendmail, 34.8. Alphabetized Reference
  • flags
  • • sendmail, 6.3. The local Delivery Agent
    • sendmail, 6.4. Add the Missing Parts to Mhub
    • sendmail, 14.2. Headers Versus Delivery Agent Flags
    • sendmail, 30.8. Alphabetized F= Flags
    • sendmail, 35.4. ?flags? in Header Definitions
  • ignoring MX records : sendmail, 21.3.5. What? They Ignore MX Records?
  • local
  • • sendmail, 6.3. The local Delivery Agent
    • sendmail, 19.6. Alphabetized m4 Macros
  • logging : sendmail, 26.1.3.4. mailer= the delivery agent used
  • printing list of : sendmail, 38.4.2. Show Delivery Agents with =M
  • as recipients : sendmail, 30.8. Alphabetized F= Flags
  • scripts via : sendmail, 24.3. Write a Delivery Agent Script
  • statistics : (see statistics)
  • symbolic name : sendmail, 30.2. The Symbolic Name
  • testing : sendmail, 38.5.6. Try a Delivery Agent with /try
  • UUCP : sendmail, 19.4.6. UUCP
• delivery mode : sendmail, 13.2.3. The Default Delivery Mode
• delivery program : sendmail, 25.7.5.1. The deliver program
• Delivery Status Notification : (see DSN)
• DeliveryMode (d) option
• • sendmail, 13.2.3. The Default Delivery Mode
  • sendmail, 23.6.1. Periodically with -q
  • sendmail, 34.8. Alphabetized Reference
• Demilitarized Zone (DMZ) : Building Internet Firewalls, 4.1. Some Firewall Definitions
• demo accounts : Practical UNIX & Internet Security, 8.1.2. Default Accounts
• demultiplexing : TCP/IP Network Administration, 2.7. Protocols, Ports, and Sockets
• denial of service
• • Building Internet Firewalls, 1.2.1.2. Denial of Service
  • Practical UNIX & Internet Security, 1.5. Role of this tutorial
  • Practical UNIX & Internet Security, 17.1.3. The /etc/inetd Program
  • Practical UNIX & Internet Security, 17.3.21.5. Denial of service attacks under X
  • Practical UNIX & Internet Security, 25. Denial of Service Attacks and Solutions
  • Practical UNIX & Internet Security, 25.3. Network Denial of Service Attacks
  • Practical UNIX & Internet Security, 25.3.4. Clogging
  • TCP/IP Network Administration, 12.1.1. Assessing the Threat
  • accidental
  • • Building Internet Firewalls, 1.2.3. Stupidity and Accidents
    • Practical UNIX & Internet Security, 25.2.5. Soft Process Limits: Preventing Accidental Denial
  • automatic lockout : Practical UNIX & Internet Security, 3.3. Entering Your Password
  • checklist for : Practical UNIX & Internet Security, A.1.1.24. Chapter 25: Denial of Service Attacks and Solutions
  • destructive attacks : Practical UNIX & Internet Security, 25.1. Destructive Attacks
  • disk attacks
  • • Practical UNIX & Internet Security, 25.2.2. Disk Attacks
    • Practical UNIX & Internet Security, 25.2.2.8. Tree-structure attacks
  • inodes : Practical UNIX & Internet Security, 25.2.2.3. Inode problems
  • internal inetd services : Practical UNIX & Internet Security, 17.1.3. The /etc/inetd Program
  • on networks
  • • Practical UNIX & Internet Security, 25.3. Network Denial of Service Attacks
    • Practical UNIX & Internet Security, 25.3.4. Clogging
  • overload attacks
  • • Practical UNIX & Internet Security, 25.2. Overload Attacks
    • Practical UNIX & Internet Security, 25.2.5. Soft Process Limits: Preventing Accidental Denial
  • via syslog : Practical UNIX & Internet Security, 10.5.1. The syslog.conf Configuration File
  • system overload attacks : Practical UNIX & Internet Security, 25.2.1.2. System overload attacks
  • X Window System : Practical UNIX & Internet Security, 17.3.21.5. Denial of service attacks under X
• departure of employees : Practical UNIX & Internet Security, 13.2.6. Departure
• depository directories, FTP : Practical UNIX & Internet Security, 17.3.2.6. Setting up anonymous FTP with the standard UNIX FTP
• dequote database
• • sendmail, 33.8. Alphabetized Reference
  • TCP/IP Network Administration, 10.7.1. Modifying Local Information
• DES (Data Encryption Standard)
• • Practical UNIX & Internet Security, 6.4.1. Summary of Private Key Systems
  • Practical UNIX & Internet Security, 6.4.4. DES
  • Practical UNIX & Internet Security, 6.4.5.2. Triple DES
  • Practical UNIX & Internet Security, 6.6.2. des: The Data Encryption Standard
  • Practical UNIX & Internet Security, 7.4.4. Encrypting Your Backups
  • Practical UNIX & Internet Security, 8.6.1. The crypt()
  • (see also authentication)
  • authentication (NIS+) : Practical UNIX & Internet Security, 19.5.4. Using NIS+
  • improving security of
  • • Practical UNIX & Internet Security, 6.4.5. Improving the Security of DES
    • Practical UNIX & Internet Security, 6.4.5.2. Triple DES
• designated router : TCP/IP Network Administration, 7.4.3. Open Shortest Path First
• designing firewalls : Building Internet Firewalls, 1.4.3. Buying Versus Building
• destination
• • TCP/IP Network Administration, 1.7. Application Layer
  • (see also unreachable destinations, detecting)
  • fields : TCP/IP Network Administration, 2.5. The Routing Table
  • host : TCP/IP Network Administration, 2.5. The Routing Table
• Destination Address
• • TCP/IP Network Administration, 1.5.1.1. The datagram
  • TCP/IP Network Administration, 2.2. The IP Address
• Destination Port number
• • TCP/IP Network Administration, 1.6.1. User Datagram Protocol
  • TCP/IP Network Administration, 1.6.2. Transmission Control Protocol
• destination unreachable codes : (see ICMP)
• Destination Unreachable Message : TCP/IP Network Administration, 1.5.2. Internet Control Message Protocol
• destroying media : Practical UNIX & Internet Security, 12.3.2.3. Sanitize your media before disposal
• destructive attacks : Practical UNIX & Internet Security, 25.1. Destructive Attacks
• detached signatures : Practical UNIX & Internet Security, 6.6.3.6. PGP detached signatures
• detail data, DSN delivery : sendmail, 30.5.2.1. The $@ dsn part
• detectors
• • cable tampering : Practical UNIX & Internet Security, 12.3.1.1. Wiretapping
  • carbon-monoxide : Practical UNIX & Internet Security, 12.2.1.2. Smoke
  • humidity : Practical UNIX & Internet Security, 12.2.1.11. Humidity
  • logging alarm systems : Practical UNIX & Internet Security, 10.7.1.1. Exception and activity reports
  • smoke : Practical UNIX & Internet Security, 12.2.1.2. Smoke
  • temperature alarms : Practical UNIX & Internet Security, 12.2.1.6. Temperature extremes
  • water sensors : Practical UNIX & Internet Security, 12.2.1.12. Water
• Deutsches Forschungsnetz : Practical UNIX & Internet Security, F.3.4.14. Germany: DFN-WiNet Internet sites
• /dev directory
• • Practical UNIX & Internet Security, 14.5.1. Hooking Up a Modem to Your Computer
  • TCP/IP Network Administration, 6.4.4. Troubleshooting Serial Connections
  • /dev/audio device : Practical UNIX & Internet Security, 23.8. Picking a Random Seed
  • /dev/console device : Practical UNIX & Internet Security, 5.6. Device Files
  • /dev/kmem device
  • • Practical UNIX & Internet Security, 5.6. Device Files
    • Practical UNIX & Internet Security, 11.1.2. Back Doors and Trap Doors
    • sendmail, 18.8. Alphabetized Reference
  • /dev/null device
  • • Practical UNIX & Internet Security, 5.6. Device Files
    • sendmail, 5.2. The Minimal File
  • /dev/random device : Practical UNIX & Internet Security, 23.7.4. Other random number generators
  • /dev/swap device : Practical UNIX & Internet Security, 5.5.1. SUID, SGID, and Sticky Bits
  • /dev/urandom device : Practical UNIX & Internet Security, 23.7.4. Other random number generators
• device statement : TCP/IP Network Administration, 5.3.1.3. Devices
• devices : Practical UNIX & Internet Security, 5.6. Device Files
• • managing with SNMP : Practical UNIX & Internet Security, 17.3.15. Simple Network Management Protocol (SNMP) (UDP Ports
  • modem control : Practical UNIX & Internet Security, 14.5.2. Setting Up the UNIX Device
  • numbers for : sendmail, 23.9. The qf File Internals
• Devices file : Practical UNIX & Internet Security, 14.5.1. Hooking Up a Modem to Your Computer
• df -i command : Practical UNIX & Internet Security, 25.2.2.3. Inode problems
• df files
• • sendmail, 3.1.2. The Queue Directory
  • sendmail, 23.2.2. The Data (Message Body) File: df
  • sendmail, 23.9. The qf File Internals
  • inode and device information : sendmail, 23.9. The qf File Internals
• dfstab file
• • TCP/IP Network Administration, 9.1.2.1. The share command
  • TCP/IP Network Administration, 9.1.5.1. NFS print services
• dgram sockets : TCP/IP Network Administration, 5.4. The Internet Daemon
• DHCP (Dynamic Host Configuration Protocol)
• • TCP/IP Network Administration, Preface
  • TCP/IP Network Administration, 3.6.1. Dynamic Host Configuration Protocol
  • interoperability and : TCP/IP Network Administration, 3.6.1. Dynamic Host Configuration Protocol
  • backwards-compatible : TCP/IP Network Administration, 9.5. DHCP
  • based on Bootstrap Protocol (BOOTP) : TCP/IP Network Administration, 9.4.2. BOOTP extensions
  • benefits of : TCP/IP Network Administration, 9.5. DHCP
  • daemon (dhcpd) : TCP/IP Network Administration, 9.5.1. dhcpd.conf
  • • command : TCP/IP Network Administration, D.2. The dhcpd Command
    • compiling : TCP/IP Network Administration, D.1. Compiling dhcpd
    • configuring : TCP/IP Network Administration, D.3. The dhcpd.conf Configuration File
    • tools reference : TCP/IP Network Administration, D. A dhcpd Reference
    • using latest versions of : TCP/IP Network Administration, D. A dhcpd Reference
  • dhcpd.conf file : TCP/IP Network Administration, 9.5.1. dhcpd.conf
  • dhcpd.pid file : TCP/IP Network Administration, D.2. The dhcpd Command
  • options available with : TCP/IP Network Administration, D.3.3. DHCP Options
  • • commonly used : TCP/IP Network Administration, D.3.3.1. Commonly used options
    • others : TCP/IP Network Administration, D.3.3.2. Other options
• diagnostic tools : TCP/IP Network Administration, 11.2. Diagnostic Tools
• diagramming the system : Building Internet Firewalls, 13.5.2. Labeling and Diagraming Your System
• dial-up connections : TCP/IP Network Administration, 6.3.1. The PPP Daemon
• dial-up IP (dip)
• • TCP/IP Network Administration, 6.3.2. Dial-Up PPP
  • TCP/IP Network Administration, 6.4.2. Dial-Up IP
  • script file : TCP/IP Network Administration, A.1.1. The dip Script File
  • • for SLIP : TCP/IP Network Administration, 6.4.2. Dial-Up IP
    • sample : TCP/IP Network Administration, A.1.1.1. A sample dip script
    • special variables, listed : TCP/IP Network Administration, A.1.1. The dip Script File
  • tools reference : TCP/IP Network Administration, A.1. Dial-Up IP
• dial-up PPP : TCP/IP Network Administration, 6.3.2. Dial-Up PPP
• DialDelay option : sendmail, 34.8. Alphabetized Reference
• dictionary attacks
• • Building Internet Firewalls, 10.3.1. One-Time Passwords
  • Practical UNIX & Internet Security, 8.6.1. The crypt()
  • TCP/IP Network Administration, 12.2. User Authentication
• Diffie-Hellman key exchange system
• • Practical UNIX & Internet Security, 6.4.2. Summary of Public Key Systems
  • Practical UNIX & Internet Security, 18.6. Dependence on Third Parties
  • Practical UNIX & Internet Security, 19.3. Secure RPC (AUTH_DES)
  • breaking key : Practical UNIX & Internet Security, 19.3.4. Limitations of Secure RPC
  • exponential key exchange : Practical UNIX & Internet Security, 19.3.1. Secure RPC Authentication
• dig
• • TCP/IP Network Administration, 11.2. Diagnostic Tools
  • TCP/IP Network Administration, 11.3. Testing Basic Connectivity
  • TCP/IP Network Administration, 11.6.4. dig: An Alternative to nslookup
• digest multipart subtype : TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions
• Digital Audio Tape (DAT) : Practical UNIX & Internet Security, 7.1.4. Guarding Against Media Failure
• digital computers : Practical UNIX & Internet Security, 6.1.2. Cryptography and Digital Computers
• Digital Equipment Corporation (DEC) : Practical UNIX & Internet Security, F.3.4.9. DEC (Digital Equipment Corporation)
• Digital Signature Algorithm : (see DSA)
• digital signatures
• • Practical UNIX & Internet Security, 6.4. Common Cryptographic Algorithms
  • Practical UNIX & Internet Security, 6.5. Message Digests and Digital Signatures
  • Practical UNIX & Internet Security, 6.5.5.2. Message authentication codes
  • Practical UNIX & Internet Security, 9.2.3. Checksums and Signatures
  • TCP/IP Network Administration, 12.6. Encryption
  • checksums
  • • Building Internet Firewalls, 5.8.5.3. About checksums for auditing
    • Practical UNIX & Internet Security, 6.5.5.1. Checksums
    • Practical UNIX & Internet Security, 9.2.3. Checksums and Signatures
    • TCP/IP Network Administration, 1.6.2. Transmission Control Protocol
    • TCP/IP Network Administration, 11.8. Protocol Case Study
    • keeping secure : Building Internet Firewalls, 13.5.3. Keeping Secured Checksums
    • recalculating
    • • TCP/IP Network Administration, 4.2.1. Obtaining an IP Address
      • TCP/IP Network Administration, 5.3.1.1. Options
    • using Tripwire for : Building Internet Firewalls, 5.8.5.1. Auditing packages
  • detached signatures : Practical UNIX & Internet Security, 6.6.3.6. PGP detached signatures
  • with PGP : Practical UNIX & Internet Security, 6.6.3.4. Adding a digital signature to an announcement
• Digital UNIX
• • Practical UNIX & Internet Security, 1.3. History of UNIX
  • (see also Ultrix)
• Dijkstra Shortest Path First (SPF) algorithm : TCP/IP Network Administration, 7.4.3. Open Shortest Path First
• dip (dial-up IP)
• • TCP/IP Network Administration, 6.3.2. Dial-Up PPP
  • TCP/IP Network Administration, 6.4.2. Dial-Up IP
  • script file : TCP/IP Network Administration, A.1.1. The dip Script File
  • • for SLIP : TCP/IP Network Administration, 6.4.2. Dial-Up IP
    • sample : TCP/IP Network Administration, A.1.1.1. A sample dip script
  • tools reference : TCP/IP Network Administration, A.1. Dial-Up IP
• diphosts file : TCP/IP Network Administration, 6.4.3. SLIP Server Configuration
• diplogin command : TCP/IP Network Administration, 6.4.3. SLIP Server Configuration
• Direct Client Connections (DCC) : Building Internet Firewalls, 8.9.2. Internet Relay Chat
• direct delivery : TCP/IP Network Administration, 3.4.1. Simple Mail Transfer Protocol
• directive statements (in gated) : TCP/IP Network Administration, B.3. Directive Statements
• directives, Makefile : sendmail, 18.4. Tuning Makefile
• directories
• • Practical UNIX & Internet Security, 5.1.1. Directories
  • Practical UNIX & Internet Security, 5.1.3. Current Directory and Paths
  • ancestor : Practical UNIX & Internet Security, 9.2.2.2. Ancestor directories
  • backing up by : Practical UNIX & Internet Security, 7.1.3. Types of Backups
  • CDFs (context-dependent files) : Practical UNIX & Internet Security, 24.4.1.7. Hidden files and directories
  • cf : sendmail, 16.1. The cf/cf Directory
  • checklist for : Practical UNIX & Internet Security, A.1.1.4. Chapter 5: The UNIX Filesystem
  • dot, dot-dot, and / : Practical UNIX & Internet Security, 5.1.1. Directories
  • FTP depositories : Practical UNIX & Internet Security, 17.3.2.6. Setting up anonymous FTP with the standard UNIX FTP
  • immutable : Practical UNIX & Internet Security, 9.1.1. Immutable and Append-Only Files
  • listing automatically (Web) : Practical UNIX & Internet Security, 18.2.2.2. Additional configuration issues
  • mounted
  • • Practical UNIX & Internet Security, 5.5.5. Turning Off SUID and SGID in Mounted Filesystems
    • Practical UNIX & Internet Security, 19.3.2.5. Mounting a secure filesystem
  • nested : Practical UNIX & Internet Security, 25.2.2.8. Tree-structure attacks
  • NFS : (see NFS)
  • permissions : Practical UNIX & Internet Security, 5.4. Using Directory Permissions
  • queue : (see queue directory)
  • read-only : Practical UNIX & Internet Security, 9.1.2. Read-only Filesystems
  • recipient's home : sendmail, 31.10. Alphabetized Reference
  • requirement for mounting : TCP/IP Network Administration, 9.1.3. Mounting Remote Filesystems
  • restricted
  • • Practical UNIX & Internet Security, 8.1.5. Restricted Filesystem
    • Practical UNIX & Internet Security, 8.1.5.2. Checking new software
  • root : (see root directory)
  • for safe file writes : sendmail, 34.8. Alphabetized Reference
  • SGI and sticky bits on : Practical UNIX & Internet Security, 5.5.6. SGID and Sticky Bits on Directories
  • Web server structure of
  • • Practical UNIX & Internet Security, 18.2.2. Understand Your Server's Directory Structure
    • Practical UNIX & Internet Security, 18.2.2.2. Additional configuration issues
  • world-writable : Practical UNIX & Internet Security, 11.6.1.1. World-writable user files and directories
• directory statement : TCP/IP Network Administration, 8.3.1.2. Primary and secondary server configurations
• <Directory> blocks
• • Practical UNIX & Internet Security, 18.3.1. The access.conf and .htaccess Files
  • Practical UNIX & Internet Security, 18.3.2. Commands Within the <Directory>
  • Practical UNIX & Internet Security, 18.3.2.1. Examples
• disabling Internet services : Building Internet Firewalls, 5.8.2. Disabling Nonrequired Services
• disabling routing : (see routers and routing, disabling)
• disasters and disaster recovery
• • Practical UNIX & Internet Security, 12.2.6.4. Minimizing downtime
  • sendmail, 21.5. Prepare for Disaster
  • TCP/IP Network Administration, 11.10. Summary
  • TCP/IP Network Administration, 12.1.1. Assessing the Threat
  • TCP/IP Network Administration, 12.1.3. Writing a Security Policy
  • TCP/IP Network Administration, 12.8. Words to the Wise
• disclosure of information, threat of : TCP/IP Network Administration, 12.1.1. Assessing the Threat
• disconnecting after incident : Building Internet Firewalls, 13.1.2. Disconnect or Shut Down, as
• disconnecting machine : Building Internet Firewalls, 13.4.3. Planning for Disconnecting or
• disk attacks
• • Practical UNIX & Internet Security, 25.2.2. Disk Attacks
  • Practical UNIX & Internet Security, 25.2.2.8. Tree-structure attacks
• disk quotas : Practical UNIX & Internet Security, 25.2.2.5. Using quotas
• disk space : (see memory; resources)
• diskettes : (see backups; media)
• disks, needs for : Building Internet Firewalls, 5.3.3. What Hardware Configuration?
• dismissed employees : Practical UNIX & Internet Security, 13.2.6. Departure
• dismounting directories, by booting : TCP/IP Network Administration, 9.1.3.1. The mount command
• disposing of materials : Practical UNIX & Internet Security, 12.3.3. Other Media
• Distfile : TCP/IP Network Administration, 9.6.1. rdist
• distributed
• • architecture : TCP/IP Network Administration, 7.5.1. Exterior Gateway Protocol
  • control : TCP/IP Network Administration, 12.1.2. Distributed Control
  • servers, managing : TCP/IP Network Administration, 9.6. Managing Distributed Servers
• Distributed Computing Environment : (see DCE)
• Distributed File System (DFS) : TCP/IP Network Administration, 3.7.1. File Sharing
• distributing public keys : TCP/IP Network Administration, 12.6. Encryption
• diversity of defense systems : Building Internet Firewalls, 3.7. Diversity of Defense
• divert command (m4)
• • sendmail, 19.1.4. m4 diversions
  • sendmail, 19.6. Alphabetized m4 Macros
• dividing problem into manageable pieces : TCP/IP Network Administration, 11.1.1. Troubleshooting Hints
• DMBDEF variable : TCP/IP Network Administration, E.4.4. The sendmail K Command
• DMBDEF= directive : sendmail, 18.4.1. DBMDEF=
• dmesg command : TCP/IP Network Administration, 6.1.1. Determining the Interface Name
• DMZ (Demilitarized Zone) : Building Internet Firewalls, 4.1. Some Firewall Definitions
• dnl command (m4) : sendmail, 19.1.2. m4 and dnl
• DNS (Domain Name Service)
• • Building Internet Firewalls, 2.9. Name Service
  • Building Internet Firewalls, 5.6. Selecting Services Provided by the
  • Practical UNIX & Internet Security, 16.2.6. Name Service
  • Practical UNIX & Internet Security, 16.2.6.2. Other naming services
  • Practical UNIX & Internet Security, 17.3.6. Domain Name System (DNS) (TCP and UDP Port 53)
  • Practical UNIX & Internet Security, 17.3.6.2. DNS nameserver attacks
  • sendmail, 17.2.1. Is the Host Local?
  • sendmail, 21.1. Overview
  • TCP/IP Network Administration, 1.7. Application Layer
  • TCP/IP Network Administration, 3.1. Names and Addresses
  • TCP/IP Network Administration, 3.3. Domain Name Service
  • (see also name service)
  • benefits of
  • • TCP/IP Network Administration, 3.3. Domain Name Service
    • TCP/IP Network Administration, 3.3.4. BIND, resolver, and named
  • bestmx_is_local feature : sendmail, 19.6. Alphabetized m4 Macros
  • configuring : Building Internet Firewalls, 8.10. Domain Name System
  • • in screened host architecture : Building Internet Firewalls, 9.2.1.6. DNS
    • in screened subnet architecture : Building Internet Firewalls, 9.1.1.6. DNS
    • without hiding information : Building Internet Firewalls, 8.10.6. Setting up DNS Without Hiding
  • data : Building Internet Firewalls, 8.10.3. DNS Data
  • disasters : sendmail, 21.5. Prepare for Disaster
  • eliminating support for : sendmail, 2.4.2. Eliminate DNS Support
  • error numbers : sendmail, B.1. Status file lines
  • fake server : Building Internet Firewalls, 8.10.5.1. Set up a `fake'
  • hiding information with : Building Internet Firewalls, 8.10.5. Setting Up DNS to Hide
  • MX records
  • • Building Internet Firewalls, 8.10.5.1. Set up a `fake'
    • Practical UNIX & Internet Security, 17.3.6. Domain Name System (DNS) (TCP and UDP Port 53)
    • sendmail, 15.3. MX Records
    • sendmail, 18.8. Alphabetized Reference
    • sendmail, 21.3. Set Up MX Records
    • sendmail, 34.8. Alphabetized Reference
    • sendmail, 38.5.2. Look Up MX Records with /mx
    • TCP/IP Network Administration, 8.3.2. Standard Resource Records
    • TCP/IP Network Administration, 8.3.6. The named.hosts File
    • TCP/IP Network Administration, 8.4. Using nslookup
    • TCP/IP Network Administration, 10.7.1. Modifying Local Information
    • TCP/IP Network Administration, C.3.1.4. Mail exchanger record
    • 0 flag : sendmail, 30.8. Alphabetized F= Flags
    • bestmx database class : sendmail, 33.8. Alphabetized Reference
    • bestmx_is_local feature : sendmail, 19.6. Alphabetized m4 Macros
    • fallback MX host : sendmail, 34.8. Alphabetized Reference
    • ignored by delivery agents : sendmail, 21.3.5. What? They Ignore MX Records?
    • looking up for addresses : sendmail, 21.2.3. Look Up Addresses for Delivery
    • offsite hosts : sendmail, 21.5.1. Offsite MX Hosts
    • with wildcards : sendmail, 21.3.4. Wildcard MX Records
  • nameserver attacks : Practical UNIX & Internet Security, 17.3.6.2. DNS nameserver attacks
  • omitting support : sendmail, 19.6. Alphabetized m4 Macros
  • querying : TCP/IP Network Administration, 10.7.1. Modifying Local Information
  • resource on : sendmail, Other Books, Other Problems
  • revealing information to attackers : Building Internet Firewalls, 8.10.4.3. Revealing too much information to
  • rogue servers : Practical UNIX & Internet Security, 16.3.2. Security and Nameservice
  • security and : Practical UNIX & Internet Security, 16.3.2. Security and Nameservice
  • server for internal hosts : Building Internet Firewalls, 8.10.5.2. Set up a real DNS
  • starting : TCP/IP Network Administration, 5.4. The Internet Daemon
  • tuning lookups : sendmail, 34.8. Alphabetized Reference
  • zone transfers
  • • Practical UNIX & Internet Security, 17.3.6. Domain Name System (DNS) (TCP and UDP Port 53)
    • Practical UNIX & Internet Security, 17.3.6.1. DNS zone transfers
• docs/warnings file : TCP/IP Network Administration, 12.4.3.1. COPS
• documentation
• • Practical UNIX & Internet Security, 2.5. The Problem with Security Through Obscurity
  • Practical UNIX & Internet Security, 23.2. Tips on Avoiding Security-related Bugs
  • historical, of problems : TCP/IP Network Administration, 11.1.1. Troubleshooting Hints
  • incidents : Building Internet Firewalls, 13.1.7. Document the Incident
  • plan for : Building Internet Firewalls, 13.4.7. Planning for Documentation
  • sendmail
  • • sendmail, Additional Sources of Information
    • sendmail, 2.2. Read the Documents
  • system after incident
  • • Building Internet Firewalls, 13.1.5. Snapshot the System
    • Building Internet Firewalls, 13.4.5. Planning for Snapshots
  • using : TCP/IP Network Administration, 4.6. Informing the Users
• dollar sign ($)
• • $ line (qf file) : sendmail, 23.9. The qf File Internals
  • $ rule-testing command : sendmail, 38.3.1. Dump a Defined Macro with $
  • in macro names : sendmail, 31.5. Macro Expansion: $ and $&
  • wildcard operators
  • • sendmail, 8.7. Wildcard Operators
    • (see also wildcard operators)
  • $1, $2, ... : (see positional operators)
  • $&
  • • sendmail, 28.6.4. Rewrite Through Another Rule Set: $>set
    • sendmail, 31.5.3. Use Value as Is with $&
  • $> : sendmail, 28.6.4. Rewrite Through Another Rule Set: $>set
  • $* : sendmail, 10.2.1. The LHS
  • $@
  • • sendmail, 9.2.2. The Host ($@)
    • sendmail, 9.3. Testing Rule Set 0
    • sendmail, 11.4.1. Rewrite the Lone Username
    • sendmail, 17.1.1.3. Handle null address
    • sendmail, 28.6.3. Rewrite-and-Return Prefix: $@
    • sendmail, 30.5.2.1. The $@ dsn part
    • sendmail, 33.4.2. Specify Numbered Substitution with $@
  • $[ and $]
  • • sendmail, 19.6. Alphabetized m4 Macros
    • sendmail, 21.2.4. The $[ and $] Operators
    • sendmail, 28.6.6. Canonicalize Hostname: $[ and $]
    • sendmail, 33.4.3. $[ and $]: A Special Case
  • $:
  • • sendmail, 9.2.3. The User ($:)
    • sendmail, 9.3. Testing Rule Set 0
    • sendmail, 28.6.2. Rewrite Once Prefix: $:
    • sendmail, 29.6.1. Further Processing: $:user
    • sendmail, 30.5.3. The $: Part
    • sendmail, 33.4.1. Specify a Default with $:
    • sendmail, 33.4. Use Maps with $( and $) in Rules
  • $.
  • • sendmail, 14.1.3. Testing So Far
    • sendmail, 31.6. Macro Conditionals: $?, $|, and $.
  • $=
  • • sendmail, 12.1. The Class Command
    • sendmail, 32.2.1. Matching Any in a Class: $=
    • sendmail, 38.3.2. Dump a Class Macro with $=
  • $#
  • • sendmail, 9.2.1. The Delivery Agent ($#)
    • sendmail, 28.6.5. Specify a Delivery Agent: $#
  • $- : sendmail, 11.4.1. Rewrite the Lone Username
  • $( and $) : sendmail, 33.4. Use Maps with $( and $) in Rules
  • $+ : sendmail, 8.7. Wildcard Operators
  • $?
  • • sendmail, 14.1.3. Testing So Far
    • sendmail, 31.6. Macro Conditionals: $?, $|, and $.
  • $~ : sendmail, 32.2.2. Matching Any Not in a Class: $~
  • $| : sendmail, 31.6. Macro Conditionals: $?, $|, and $.
  • $_ macro
  • • sendmail, 20.2.4. Verify identd Information
    • sendmail, 23.9. The qf File Internals
    • sendmail, 26.1.3.9. relay= the host that sent or accepted the message
    • sendmail, 31.10. Alphabetized Reference
• DOL macro (m4) : sendmail, 19.6. Alphabetized m4 Macros
• DOMAIN() : sendmail, 19.3.3. DOMAIN()
• DOMAIN macro (in sendmail) : TCP/IP Network Administration, E.3. m4 sendmail Macros
• Domain Name Pointer records : (see PTR resource records)
• Domain Name Service : (see DNS)
• domain names
• • Practical UNIX & Internet Security, 16.2.3. Hostnames
  • sendmail, 8.1. A Fictional Network
  • sendmail, 19.6. Alphabetized m4 Macros
  • sendmail, 31.10. Alphabetized Reference
  • TCP/IP Network Administration, 3.3.3. Domain Names
  • TCP/IP Network Administration, 4. Getting Started
  • application form : TCP/IP Network Administration, 4.4.1. Obtaining a Domain Name
  • fully qualified : TCP/IP Network Administration, 3.3.3. Domain Names
  • in NIS : TCP/IP Network Administration, 9.3. Network Information Service
  • obtaining : TCP/IP Network Administration, 4.4.1. Obtaining a Domain Name
  • parameter : TCP/IP Network Administration, 9.4. A BOOTP Server
• DOMAIN source file (in sendmail)
• • TCP/IP Network Administration, E.3.2. FEATURE
  • TCP/IP Network Administration, E.3.4. DOMAIN
  • mail relay defines, listed : TCP/IP Network Administration, E.3.4. DOMAIN
• domain-type addresses : sendmail, 17.1.3. Internet Addresses
• domain/named.root : TCP/IP Network Administration, 11.6.3. Cache corruption
• domainname command
• • Practical UNIX & Internet Security, 19.4.3. NIS Domains
  • TCP/IP Network Administration, 9.3. Network Information Service
• domains
• • Practical UNIX & Internet Security, 19.4.3. NIS Domains
  • TCP/IP Network Administration, 1.7. Application Layer
  • accepting only internal mail : sendmail, 20.2.1. Accept Mail Only From Our Domain
  • adding to recipient address : sendmail, 30.8. Alphabetized F= Flags
  • administration
  • • TCP/IP Network Administration, 3.3.4. BIND, resolver, and named
    • TCP/IP Network Administration, 8.1. BIND: UNIX Name Service
    • contacting : TCP/IP Network Administration, 13.6. The White Pages
  • allocating : (see Network Information Center)
  • always_add_domain feature : sendmail, 19.6. Alphabetized m4 Macros
  • creating : TCP/IP Network Administration, 3.3.2. Creating Domains and Subdomains
  • downloading an entire : TCP/IP Network Administration, 8.4. Using nslookup
  • entry, in resolv.conf : TCP/IP Network Administration, 8.2.1. The Resolver Configuration File
  • FQDN : (see FQDNs)
  • hierarchy
  • • TCP/IP Network Administration, 3.3.1. The Domain Hierarchy
    • TCP/IP Network Administration, 8.1. BIND: UNIX Name Service
  • list of local : sendmail, 32.5. Alphabetized Reference
  • masquerading : sendmail, 19.6. Alphabetized m4 Macros
  • name servers : TCP/IP Network Administration, 4.2.1.1. Assigning host addresses
  • • parameter : TCP/IP Network Administration, 9.4. A BOOTP Server
  • organizational : TCP/IP Network Administration, 3.3.1. The Domain Hierarchy
  • part of hostname : (see $m macro)
  • virtual, mapping to addresses : sendmail, 19.6. Alphabetized m4 Macros
• domaintable database
• • TCP/IP Network Administration, 10.7.1. Modifying Local Information
  • sendmail, 19.6. Alphabetized m4 Macros
• DontExpandCNames option : sendmail, 34.8. Alphabetized Reference
• DontInitGroups option : sendmail, 34.8. Alphabetized Reference
• DontPruneRoutes command : sendmail, 34.8. Alphabetized Reference
• dormant accounts
• • Practical UNIX & Internet Security, 8.4. Managing Dormant Accounts
  • Practical UNIX & Internet Security, 8.4.3. Finding Dormant Accounts
• dot (.)
• • . line (qf file) : sendmail, 23.9. The qf File Internals
  • checking for in ${pd} : sendmail, D.1. Sun Enhancements
  • for current directory : Practical UNIX & Internet Security, 5.1.1. Directories
  • to end messages
  • • sendmail, 4.2. Verbose (-v)
    • sendmail, 30.8. Alphabetized F= Flags
  • filenames starting with, disabling creation of : Building Internet Firewalls, 8.2.1.6. Be careful of writable
  • host status file line : sendmail, B.1. Status file lines
  • leading in messages : sendmail, 34.8. Alphabetized Reference
  • trailing in FQDNs
  • • sendmail, 15.3. MX Records
    • sendmail, 17.4. Rule Set 4
    • sendmail, 29.5.1. Stripping Trailing Dots
  • .. directory : Practical UNIX & Internet Security, 5.1.1. Directories
  • .. for domain name : TCP/IP Network Administration, C.3.1. Standard Resource Records
• dotted decimal notation : TCP/IP Network Administration, 2.3. Subnets
• Double DES : Practical UNIX & Internet Security, 6.4.5. Improving the Security of DES
• double quotation marks (")
• • sendmail, 13.2.8. The Unquoted Space Replacement Character
  • sendmail, 31.3.2. Syntax of the Configuration File Macro's Text
• double-reverse lookups
• • Practical UNIX & Internet Security, 16.3.2. Security and Nameservice
  • Building Internet Firewalls, 8.10.4.2. Mismatched data between the hostname
  • Building Internet Firewalls, 8.10.5.1. Set up a `fake'
• DoubleBounceAddress option : sendmail, 34.8. Alphabetized Reference
• DOW USA : Practical UNIX & Internet Security, F.3.4.10. DOW USADOW USA
• down sites : sendmail, 23.7.1. Handling a Down Site
• downloading files : Practical UNIX & Internet Security, 12.3.4. Protecting Local Storage
• • logging
  • • Practical UNIX & Internet Security, 10.3.3. xferlog Log File
    • Practical UNIX & Internet Security, 10.3.5. access_log Log File
• downtime : Practical UNIX & Internet Security, 12.2.6.4. Minimizing downtime
• • due to criminal investigations : Practical UNIX & Internet Security, 26.2.4. Hazards of Criminal Prosecution
  • logging : Practical UNIX & Internet Security, 10.7.2.1. Exception and activity reports
• drand48 function : Practical UNIX & Internet Security, 23.7.3. drand48 ( ), lrand48 ( ), and mrand48 ( )
• Drawbridge package : Building Internet Firewalls, B.3.2. Drawbridge
• drills, security : Practical UNIX & Internet Security, 24.1.3. Rule #3: PLAN AHEAD
• drink : Practical UNIX & Internet Security, 12.2.2.1. Food and drink
• ds.internic.net : TCP/IP Network Administration, 13.4. Retrieving RFCs
• DSA (Digital Signature Algorithm)
• • Practical UNIX & Internet Security, 6.4.2. Summary of Public Key Systems
  • Practical UNIX & Internet Security, 6.5.3. Digital Signatures
• DSN (Delivery Status Notification)
• • sendmail, 6.3. The local Delivery Agent
  • sendmail, B.1. Status file lines
  • DSN macro : sendmail, 18.8. Alphabetized Reference
  • ENVID identifier
  • • sendmail, 23.9. The qf File Internals
    • sendmail, 36.7. Alphabetized Reference
  • ORCPT address : sendmail, 23.9. The qf File Internals
  • original envelope ID : sendmail, 31.10. Alphabetized Reference
  • types for : (see T= equate)
• DTE (data terminal equipment) : Practical UNIX & Internet Security, 14.3. The RS-232 Serial Protocol
• du command : Practical UNIX & Internet Security, 25.2.2.1. Disk-full attacks
• dual-homed hosts
• • Building Internet Firewalls, 7. Proxy Systems
  • (see also proxy servers/services)
  • architecture of : Building Internet Firewalls, 4.2.1. Dual-Homed Host Architecture
  • • with screen subnet architecture : Building Internet Firewalls, 4.3.8. It's OK to Use
  • as firewall : Building Internet Firewalls, 5.8.2.5. Turning off routing
  • nonrouting : Building Internet Firewalls, 5.2.1. Nonrouting Dual-homed Hosts
  • proxy services and : (see proxy servers/services)
• dual universes : Practical UNIX & Internet Security, 5.9.1. Dual Universes
• ducts, air : Practical UNIX & Internet Security, 12.2.3.2. Entrance through air ducts
• dummy interface : TCP/IP Network Administration, 5.2. Linux Kernel Configuration
• dump : TCP/IP Network Administration, 7.7.2. Testing the Configuration
• dump/restore program
• • Practical UNIX & Internet Security, 7.1.3. Types of Backups
  • Practical UNIX & Internet Security, 7.4.3. Specialized Backup Programs
  • Practical UNIX & Internet Security, 7.4.4. Encrypting Your Backups
• dumping macros : sendmail, 38.3. Dump a Macro
• dumping state : sendmail, 26.3.3. SIGUSR1 Dump States
• dumpster diving : Practical UNIX & Internet Security, 12.3.3. Other Media
• duplicate database keys : sendmail, 33.2.1.1. -d allow duplicate keys
• duplicate entries in alias file : sendmail, 24.4.4. Duplicate Entries and Automation
• duress code : Practical UNIX & Internet Security, 8.7.2. Token Cards
• dust : Practical UNIX & Internet Security, 12.2.1.3. Dust
• dynamic
• • assignment of addresses
  • • TCP/IP Network Administration, 3.6.1. Dynamic Host Configuration Protocol
    • TCP/IP Network Administration, 4.2.1.1. Assigning host addresses
    • automatic under DHCP : TCP/IP Network Administration, 9.5. DHCP
    • circumstances favoring : TCP/IP Network Administration, 4.3. Planning Routing
  • packet filtering
  • • Building Internet Firewalls, 6.3.3.2. UDP
    • Building Internet Firewalls, 8.2.1.1. Packet filtering characteristics of
  • port allocation : TCP/IP Network Administration, 2.7.3. Sockets
  • routing
  • • TCP/IP Network Administration, 4.3. Planning Routing
    • TCP/IP Network Administration, 7.1. Common Routing Configurations
• Dynamic DNS : TCP/IP Network Administration, 3.6.1. Dynamic Host Configuration Protocol
• Dynamic Host Configuration Protocol : (see DHCP)
• dynamic-bootp flag : TCP/IP Network Administration, D.3.2. Configuration Parameters
• dynamic-bootp-lease-cutoff parameter : TCP/IP Network Administration, 9.5.1. dhcpd.conf
• dynamic-bootp-lease-length parameter : TCP/IP Network Administration, 9.5.1. dhcpd.conf

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