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Index: U

U flag (Linux routing table): 2.4. The Routing Table

udp option (fstab file): 9.1.3.2. The vfstab and fstab files

UDP (User Datagram Protocol): 1.2. A Data Communications Model

Transport Layer: 1.6.1. User Datagram Protocol

uid field (inet.conf file): 5.3. The Internet Daemon

UID (user ID)

exports file: 9.1.2.2. The /etc/exports file
mapping users to: 9.1.2.2. The /etc/exports file
share command: 9.1.2.1. The share command

undefine macro (sendmail): E.3. m4 sendmail Macros

unicast addresses: 2.2. The IP Address

unicast multicast parameter (gated): B.8.3. The isis Statement

Unix

BSD

configuration file: 5.1.4. The BSD Kernel Configuration File
devices statement: 5.1.5.3. The device statement
options statement: 5.1.5.1. The options statement
pseudo-device statement: 5.1.5.2. The pseudo-device statement

configuration files, startup: 5.2. Startup Files

dynamically loadable modules: 5.1.1. Using Dynamically Loadable Modules

ifconfig command, overview: 6.1. The ifconfig Command

lpr command: 3.5.2. Print Services

Network Access Layer: 1.4. Network Access Layer

NIS maps: 9.4. Network Information Service

port numbers: 2.6.2. Port Numbers

protocol numbers: 2.6.1. Protocol Numbers

r commands

disabling: 12.2.6. Secure Shell
security considerations: 12.2.5. Secure the r Commands

routing tables: 2.4. The Routing Table

serial ports, troubleshooting: 6.3.7. Troubleshooting Serial Connections

services: 2.6.2. Port Numbers

TCP/IP and: 1.1. TCP/IP and the Internet

Unknown host error (ping command): 13.3. Testing Basic Connectivity

UNKNOWN keyword (security): 12.5.1.1. tcpd access control files

Unreachable Port message: 13.5.1. Tracing Routes

UP flag (ifconfig command): 6.1.2. Checking the Interface with ifconfig

update (EGP trace option): B.8.5. The egp Statement

update keyword (dbmmanage command): 11.4.4.2. Improved user authentication

UPDATE messages (BGP): 7.5.2. Border Gateway Protocol

updates (EGP): 7.5.1. Exterior Gateway Protocol

updetach option (pppd): A.2. The PPP Daemon

Use field (Linux routing table): 2.4. The Routing Table

2.4. The Routing Table

use-host-decl-names parameter (dhcpd): D.3.2. Configuration Parameters

use-id-pool option (named): C.2.5. The options Statement

use-lease-addr-for-default-route parameter (dhcpd): D.3.2. Configuration Parameters

Use Nice field (sendmail): 10.5.8. Defining Mailers

UseCanonicalName directive (httpd.conf file): 11.3.2. Basic Configuration Directives

use_ct_file (sendmail): E.3.2. FEATURE

use_cw_file (sendmail): E.3.2. FEATURE

usehostname option (pppd command): 6.3.4. PPP Daemon Security

A.2. The PPP Daemon

usenet mailer: E.3.5. MAILER

usepeerdns option (pppd): A.2. The PPP Daemon

user authentication (see authentication)

USER command (POP): 3.4.2. Post Office Protocol

User Datagram Protocol (see UDP)

User directive (Apache): 11.3.3. Managing the Swarm

user option (pppd): A.2. The PPP Daemon

user (sendmail K command value): E.4.5. The sendmail K Command

user setting (smb.config file): 9.3.1. Configuring a Samba Server

USERCTL (Linux configuration value): 6.1.3. Assigning an Address

UserDir directive (httpd.conf file): 11.3.4. Defining Where Things Are Stored

Userid field (sendmail): 10.5.8. Defining Mailers

USERID option (xinetd): 12.5.2. Controlling Access with xinetd

UUCP protocol: 3.4.1. Simple Mail Transfer Protocol

uucpdomain (sendmail database feature): E.3.2. FEATURE

UUCPSMTP macro (sendmail): E.3. m4 sendmail Macros

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