index_U

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U flag (Linux routing table) 
UDP (User Datagram Protocol) 
    Transport Layer 
udp option (fstab file) 
UID (user ID)
    exports file 
    mapping users to 
    share command 
uid field (inet.conf file) 
undefine macro (sendmail) 
unicast addresses 
unicast multicast parameter (gated) 
Unix
    BSD
        configuration file 
        devices statement 
        options statement 
        pseudo-device statement 
    configuration files, startup 
    dynamically loadable modules 
    ifconfig command, overview 
    lpr command 
    Network Access Layer 
    NIS maps 
    port numbers 
    protocol numbers 
    r commands
        disabling 
        security considerations 
    routing tables 
    serial ports, troubleshooting 
    services 
    TCP/IP and 
Unknown host error (ping command) 
UNKNOWN keyword (security) 
Unreachable Port message 
UP flag (ifconfig command) 
update (EGP trace option) 
update keyword (dbmmanage command) 
UPDATE messages (BGP) 
updates (EGP) 
updetach option (pppd) 
Use field (Linux routing table)  2nd 
Use Nice field (sendmail) 
use-host-decl-names parameter (dhcpd) 
use-id-pool option (named) 
use-lease-addr-for-default-route parameter (dhcpd) 
use_ct_file (sendmail) 
use_cw_file (sendmail) 
UseCanonicalName directive (httpd.conf file) 
usehostname option (pppd command)  2nd 
usenet mailer 
usepeerdns option (pppd) 
user (sendmail K command value) 
user authentication  [See authentication]
USER command (POP) 
User Datagram Protocol  [See UDP]
User directive (Apache) 
user option (pppd) 
user setting (smb.config file) 
USERCTL (Linux configuration value) 
UserDir directive (httpd.conf file) 
Userid field (sendmail) 
USERID option (xinetd) 
UUCP protocol 
uucpdomain (sendmail database feature) 
UUCPSMTP macro (sendmail)