trouble-shooting eth0 problems

[Alan Mead <adm ipat com>]

I'm in a bind and I thought some expert advice might save me a lot of time.

I now wish to have my RH 6.0 machine on the LAN here.  I opened the case,
added a HP ISA card (no jumpers), booted, configured eth0 in the network
tool in control panel in X, removed the old ethernet module and loaded
hp100 (I modprobed in net for h* and the hp100 loaded and seemed happy).  I
edited conf.modules to make hp100 the eth0 alias.  At some point I pluged
the ethernet into it.  

When I boot I get all [OK] messages (except for NFS which I'm going to rip
out shortly).  

But I cannot ping anything nor be pinged.  The wire functioned last night
(with another computer) so I think the problem must be in the card or my
configuration.

So what now?  What could be preventing the system from working correctly
and what do I do to trouble shoot and fix?

Your advice appreciated!  I'll be happy to post back more info.  Thanks in
advance!

-Alan
---
Alan D. Mead  /  Research Scientist  /  adm ipat com
Institute for Personality and Ability Testing
1801 Woodfield Dr  /  Savoy IL 61874 USA
217-352-4739 (v)  /  217-352-9674 (f)