can the machine (linuxbox) ping the others? (if that's the case, then as the previous poster mentioned, icmp echo reply is blocked.
however, if the machine cannot ping to others.. then it's likely the NIC has been initialized. (started up)
try: service network start, or service network restart (and check the output it gives)
or try ifup eth0 (first networkcard/device on the system, eth1 is second device etc etc)
you can view the config that the nic(s) have, by issueing:
also make sure the cabling is correct.
Last edited by teebones; 08-20-2009 at 08:29 AM.