Quoting Hemminger, Jeffrey D. (JDHEMMINGER at stthomas.edu):
> Hi All,
> I'm a brand new user, and I'm charged with setting up 2 servers both running
> RH7.2 on a very small private network (a development environment). I've
> installed an email service on each, but I'm having trouble getting as much
> as a ping between the two boxes.
> I've modified /etc/hosts, /etc/host.conf, and /etc/sysconfig/network. I'm
> using a generic, supported NIC, everything was working fine before I took it
> off the University's network, eth0 seems ok, and I've checked the cables and
> hub.
> I'm looking for 1) Am I missing something obvious or did I modify a conf
> file I wasn't supposed to? and/or 2) some simple troubleshooting ideas?
> I've scoured the internet and several books (my manual is RH7.2 Unleashed,
> which I don't recommend to anyone FWIW), and I seem to be getting caught
> between either a HOWTO that's more complicated than I'm looking for (I don't
> need DNS, for example), or a dumbed down version that has me edit conf files
> that I don't need from a different distribution (RH7.2 does not require
> /etc/HOSTNAME, for example).
> 
> Thanks in advance for any help you can offer,

Try netconfig, to make sure all your parameters are right.

http://www.tldp.org/HOWTO/Net-HOWTO/index.html <- might help too


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