[K12OSN] OT:ipchains, firewalls, nat, forwarding

Eric Brown ericbrown at mi-spot.com
Thu Dec 1 01:42:25 UTC 2005

I call this OT because it's not on a K12LTSP installation.  I chose not to
install a firewall on my K12LTSP installation to simplify matters, since our
district is  "supposed" to handle all that.  I never had any trouble with
the terminal server forwarding things.

I just recieved another server where the vendor installed Fedora core 4 with
the  "Install everything" option, as well as installing a firewall.  THis
machine is going to act as a gateway machine and a file server for a bunch
of XP machines.  Thanks to a question I asked this group a few months ago, I
managed to get DHCP running.  With some googleing, I can ping an external IP
from one of the XP machines.  I would like to allow dns and web access, but
I want to kill any MSN access and pretty much anything else.

So I'm split.  I could ease my headach and turn off the firewall.  Would the
fileserver then allow all traffic through it?

OR (and I've been searching on this all day), how can I turn it on to allow
port s 53 and 80 through the file server.  Better yet, can anyone point me
to a very *simple* explanation of how to do this in general (give a man a
fish...).  All references I could find were too lengthy or strictly involved
ppp which isn't being used here.

If it helps, eth0 is to the external network, eth1 is for my small internal

Thanks in advance.
Eric Brown

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