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Index: O
- configuration command
- -o database switch : sendmail, 33.3.4.8. -o the database file is optional (V8.1 and above)
- -O database switch : sendmail, 33.3.4.7. -O adaptive versus never add a null (V8.2 and above)
- flag : sendmail, 30.8. Alphabetized F= Flags
- lines in sendmail.cf : sendmail, 3.1. Role in the Filesystem
- $o macro : (see OperatorChars (o) option)
- option : (see OldStyleHeaders (o) option)
- option : (see DaemonPortOptions (O) option)
- -o switch (F command) : sendmail, 12.2. The File Form of Class
- -o switch (makemap) : sendmail, 33.2.1.4. -o append to, don't overwrite the file
- -o switch (sendmail) : sendmail, 36.7. Alphabetized Reference
- -O switch (sendmail) : sendmail, 36.7. Alphabetized Reference
- OBJADD= directive : sendmail, 18.4.10. OBJADD=
- object identifier : TCP/IP Network Administration, 11.9. Simple Network Management Protocol
- obscurity
-
- Building Internet Firewalls, 1.3.2. Security Through Obscurity
- Practical UNIX & Internet Security, 2.5. The Problem with Security Through Obscurity
- Practical UNIX & Internet Security, 2.5.3. Final Words: Risk Management Means Common Sense
- Practical UNIX & Internet Security, 8.8.9. Account Names Revisited: Using Aliases for Increased
- Practical UNIX & Internet Security, 18.2.4. Keep Your Scripts Secret!
- obtaining
-
- BIND via FTP : sendmail, 21.1.1. Which DNS? 4.8.3 or 4.9?
- db library package : sendmail, C.2. Get the Source
- sendmail source code
- octal file permissions
- octal-type arguments : sendmail, 34.5. Option Argument Types
- octet data
- octet-stream application subtype : TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions
- Odlyzko, Andrew : Practical UNIX & Internet Security, 19.3.4. Limitations of Secure RPC
- -odq switch : sendmail, 23.6.1. Periodically with -q
- Oerrs (output errors) : TCP/IP Network Administration, 11.4.3. Checking the Interface with netstat
- OFB (output feedback) : Practical UNIX & Internet Security, 6.4.4.2. DES modes
- offsite primary name servers : sendmail, 21.5.2. Offsite Servers
- "ok" message : sendmail, 4.2. Verbose (-v)
- old-style address lists : sendmail, 13.2.7. Accept Old-Style Lists of Addresses
- OLD_NEWDB macro : sendmail, 18.8. Alphabetized Reference
- OldStyleHeaders (o) option
- on program : Building Internet Firewalls, 2.3. Remote Terminal Access and Command
- on-the-job security
- one : Practical UNIX & Internet Security, 9.2.1. Comparison Copies
- one-command accounts : Practical UNIX & Internet Security, 8.1.3. Accounts That Run a Single Command
- one-time pad encryption
- one-time passwords
-
- Building Internet Firewalls, 10.3.1. One-Time Passwords
- Practical UNIX & Internet Security, 8.7. One-Time Passwords
- Practical UNIX & Internet Security, 8.7.3. Code Books
- Practical UNIX & Internet Security, 17.4. Security Implications of Network Services
- Practical UNIX & Internet Security, 23.3. Tips on Writing Network Programs
- TCP/IP Network Administration, Preface
- TCP/IP Network Administration, 12.2.3. One-Time Passwords
- One-time Passwords In Everything (OPIE) : TCP/IP Network Administration, 12.2.4. OPIE
- one-way phone lines : Practical UNIX & Internet Security, 14.4.1. One-Way Phone Lines
- ONEX command, in ESMTP : TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions
- open access, tradition of : Practical UNIX & Internet Security, 1.4.1. Expectations
- open accounts
- open command
- open file descriptors : sendmail, 26.3.3.1. -- open file descriptors: --
- open protocol suite : TCP/IP Network Administration, 3.7.1. File Sharing
- Open Shortest Path First : (see OSPF protocol)
- Open Software Foundation (OSF) : Practical UNIX & Internet Security, 1.3. History of UNIX
- Open System Interconnection (OSI)
- opendir library call : Practical UNIX & Internet Security, 5.4. Using Directory Permissions
- openlog command : sendmail, 26.1.1. syslog(3)
- operating systems
-
- Building Internet Firewalls, Platforms
- Practical UNIX & Internet Security, 1.2. What Is an Operating System?
- Practical UNIX & Internet Security, 12.3.3. Other Media
- administration : (see system administration)
- choosing : Building Internet Firewalls, 5.3.1. What Operating System?
- errors
- file failure : sendmail, 36.5.6. EX_OSFILE A Critical System File Failure
- fixing bugs in : Building Internet Firewalls, 5.8.1.2. Fix all known system bugs
- installation of : Building Internet Firewalls, 5.8.1.1. Start with a minimal clean operating system
- keeping secret : Practical UNIX & Internet Security, 2.5. The Problem with Security Through Obscurity
- load : (see performance)
- multiple, and proxying : Building Internet Firewalls, 7.1. Why Proxying?
- OSTYPE declaration
- testing reload of : Building Internet Firewalls, 13.5.6. Testing the Reload of the Operating
- UNIX : (see UNIX)
- OperatorChars (o) option
- operators, token separation : (see OperatorChars (o) option)
- opiekey software : TCP/IP Network Administration, 12.2.4. OPIE
- opiepassword : TCP/IP Network Administration, 12.2.4. OPIE
- ${opmode} macro : sendmail, 31.10. Alphabetized Reference
- optic cables : (see cables, network)
- optical vampire taps : Practical UNIX & Internet Security, 12.3.1.5. Fiber optic cable
- option set, invoking dialup IP (dip) : TCP/IP Network Administration, A.1. Dial-Up IP
- optional database files : sendmail, 33.3.4.8. -o the database file is optional (V8.1 and above)
- Options command : Practical UNIX & Internet Security, 18.3.2. Commands Within the <Directory>
- options entry, in resolv.conf : TCP/IP Network Administration, 8.2.1. The Resolver Configuration File
- option field, in DHCP : TCP/IP Network Administration, 3.6.1. Dynamic Host Configuration Protocol
- options file
- options statement : TCP/IP Network Administration, 5.3.1.1. Options
- options, sendmail
-
- sendmail, 3.1. Role in the Filesystem
- sendmail, 4. How to Run sendmail
- sendmail, 5.3.7. Options
- sendmail, 13. Setting Options
- sendmail, 19.4.1. Options
- sendmail, 34. Options
- (see also switches, command-line)
- m4 and : sendmail, 34.3. Configuring with V8 m4 Options
- multicharacter
- required : sendmail, 13.2. Required Options
- safe : sendmail, 34.1.4. Options that Are Safe
- security : sendmail, 22.8.3. Security Options
- single-character : sendmail, 36.7. Alphabetized Reference
- testing : sendmail, 13.3. Testing the Options
- options.device file : TCP/IP Network Administration, A.2. The PPP Daemon
- Orange Book : Practical UNIX & Internet Security, 2.3.3. Adding Up the Numbers
- ORCPT address : sendmail, 23.9. The qf File Internals
- org domain : TCP/IP Network Administration, 3.3.1. The Domain Hierarchy
- origin date, message : (see $a macro)
- originate mode : Practical UNIX & Internet Security, 14.3.1. Originate and Answer
- originate testing : Practical UNIX & Internet Security, 14.5.3.1. Originate testing
- orphaned locks : sendmail, 23.2.3.3. Locks can get stuck
- OSF (Open Software Foundation) : Practical UNIX & Internet Security, 1.3. History of UNIX
- OSF/1 operating system : Practical UNIX & Internet Security, 1.3. History of UNIX
- OSI (Open System Interconnection)
- OSPF protocol
- ospf statement (in gated) : TCP/IP Network Administration, B.8.1. The ospf Statement
- ospfase protocol : TCP/IP Network Administration, 7.7.1.3. Exterior gateway configuration
- OSTYPE command (m4)
- out-of-date files, defined : TCP/IP Network Administration, 9.6.1. rdist
- outgoing (outbound)
-
- calls : Practical UNIX & Internet Security, 14.5. Modems and UNIX
- finger requests : Building Internet Firewalls, 8.8.1. finger
- mail, logging : Practical UNIX & Internet Security, 10.4.2. Mail
- packets : Building Internet Firewalls, 6.2.2. Be Careful of `Inbound'
- Outcome table (NIS+) : Practical UNIX & Internet Security, 19.5.3. NIS+ Tables
- outdated software : (see software)
- output
-
- debugging : sendmail, 37.3. Interpreting the Output
- errors (Oerrs) : TCP/IP Network Administration, 11.4.3. Checking the Interface with netstat
- feedback (OFB) : Practical UNIX & Internet Security, 6.4.4.2. DES modes
- rule testing : sendmail, 38.6.4. The Output
- syslog : sendmail, 26.1.3. syslog's Output
- outsiders : Practical UNIX & Internet Security, 13.3. Outsiders
- overload attacks
- overruns : (see buffers, overruns)
- overtime : Practical UNIX & Internet Security, 13.2.3. Performance Reviews and Monitoring
- overwhelming the server : TCP/IP Network Administration, 9.4. A BOOTP Server
- overwriting
- OW- (sendmail.cf) : Practical UNIX & Internet Security, 17.3.4.2. Using sendmail to receive email
- owner, mailing list : sendmail, 25.3. Defining a Mailing List Owner
- owner-admin alias : TCP/IP Network Administration, 10.3. sendmail Aliases
- owners of information : Practical UNIX & Internet Security, 2.4.4.1. Assign an owner
- owners, changing : Practical UNIX & Internet Security, 5.7. chown: Changing a File's Owner
- ownership : (see permissions)
- ownership notices : Practical UNIX & Internet Security, 26.2.6. Other Tips
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