Just add the computers to /etc/hosts. Here's mine, to give you an idea how it looks:
Code:
#
# hosts This file describes a number of hostname-to-address
# mappings for the TCP/IP subsystem. It is mostly
# used at boot time, when no name servers are running.
# On small systems, this file can be used instead of a
# "named" name server. Just add the names, addresses
# and any aliases to this file...
#
# By the way, Arnt Gulbrandsen <agulbra@nvg.unit.no> says that 127.0.0.1
# should NEVER be named with the name of the machine. It causes problems
# for some (stupid) programs, irc and reputedly talk. :^)
#
# For loopbacking.
127.0.0.1 localhost
# My LAN
192.168.0.1 router.is-a-geek.com router
192.168.0.100 shilo.is-a-geek.com shilo mail web www
192.168.0.101 hp4050.is-a-geek.com hp4050 hp laser laserjet printer
192.168.0.103 shilo2.is-a-geek.com shilo2
192.168.0.110 mythtv.is-a-geek.com mythtv
# End of hosts
.