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Index: U

U flag (Linux routing table): 2.4. The Routing Table
udp option (fstab file): 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: The /etc/exports file
mapping users to: The /etc/exports file
share command: 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
configuration file: 5.1.4. 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: 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): 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): 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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