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Index: U

• U flag (Linux routing table): The Routing Table
• udp option (fstab file): The vfstab and fstab files
• UDP (User Datagram Protocol): Data Communications Model
• • Transport Layer: User Datagram Protocol
• uid field (inet.conf file): The Internet Daemon
• UID (user ID)
• • exports file: The /etc/exports file
  • mapping users to: The /etc/exports file
  • share command: The share command
• undefine macro (sendmail): sendmail Macros
• unicast addresses: The IP Address
• unicast multicast parameter (gated): The isis Statement
• Unix
• • BSD
  • • configuration file: The BSD Kernel Configuration File
    • devices statement: The device statement
    • options statement: The options statement
    • pseudo-device statement: The pseudo-device statement
  • configuration files, startup: Startup Files
  • dynamically loadable modules: Using Dynamically Loadable Modules
  • ifconfig command, overview: The ifconfig Command
  • lpr command: Print Services
  • Network Access Layer: Network Access Layer
  • NIS maps: Network Information Service
  • port numbers: Port Numbers
  • protocol numbers: Protocol Numbers
  • r commands
  • • disabling: Secure Shell
    • security considerations: Secure the r Commands
  • routing tables: The Routing Table
  • serial ports, troubleshooting: Troubleshooting Serial Connections
  • services: Port Numbers
  • TCP/IP and: TCP/IP and the Internet
• Unknown host error (ping command): Testing Basic Connectivity
• UNKNOWN keyword (security): tcpd access control files
• Unreachable Port message: Tracing Routes
• UP flag (ifconfig command): Checking the Interface with ifconfig
• update (EGP trace option): The egp Statement
• update keyword (dbmmanage command): Improved user authentication
• UPDATE messages (BGP): Border Gateway Protocol
• updates (EGP): Exterior Gateway Protocol
• updetach option (pppd): The PPP Daemon
• Use field (Linux routing table): The Routing Table
• • The Routing Table
• use-host-decl-names parameter (dhcpd): Configuration Parameters
• use-id-pool option (named): The options Statement
• use-lease-addr-for-default-route parameter (dhcpd): Configuration Parameters
• Use Nice field (sendmail): Defining Mailers
• UseCanonicalName directive (httpd.conf file): Basic Configuration Directives
• use_ct_file (sendmail): FEATURE
• use_cw_file (sendmail): FEATURE
• usehostname option (pppd command): PPP Daemon Security
• • The PPP Daemon
• usenet mailer: MAILER
• usepeerdns option (pppd): The PPP Daemon
• user authentication (see authentication)
• USER command (POP): Post Office Protocol
• User Datagram Protocol (see UDP)
• User directive (Apache): Managing the Swarm
• user option (pppd): The PPP Daemon
• user (sendmail K command value): The sendmail K Command
• user setting (smb.config file): Configuring a Samba Server
• USERCTL (Linux configuration value): Assigning an Address
• UserDir directive (httpd.conf file): Defining Where Things Are Stored
• Userid field (sendmail): Defining Mailers
• USERID option (xinetd): Controlling Access with xinetd
• UUCP protocol: Simple Mail Transfer Protocol
• uucpdomain (sendmail database feature): FEATURE
• UUCPSMTP macro (sendmail): sendmail Macros

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