dual nic setup in Debian

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Folks,

If anyone has a Debian fireall box using two nics and some services
running on it, please help!!!!

I'm fairly certain my ipchains script is ok, but here's what happening.

I booted the box and it has all the info my current Slackware
server/firewall box has so in other words the ips are correct and the
nics I've installed appear to be up and showing the correct ips as well.
I simply can't get outside my own firewall. I tried flushing the rules,
but not so sure that is the problem either. I will say that I am running
a 2.4.18 kernel and added in the ipchains style packet filtering to work
with my old ipchains script I copied from my current Slackware box.
I can ping both interfaces, both internal and external. It would appear
that perhaps packets aren't being forwarded, but I probably am missing
something somewhere.
Does Debian have a document on how to setup my type of configuration? I
may simply again be missing some critical step. Slack and Debian are
different enough that I've probably simply missed something and have
forgotten. I've had a working box for so long that I've not had to mess
with it much.<grin>

tnx

Btw, has anyone upgraded an older Slackware install to a new one? Did
the upgrade go well, was it simple enough as far as packages working out
without blowups etc.? Did you have to boot off new boot and roots
floppies to do the install?

I've heard getting the new Slackware is difficult and something about
the floppies will not work?

tnx





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