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Re: [K12OSN] Firewall



On Mon, 23 Dec 2002, John Pilmore wrote:

>Can anybody help me with a firewalling question? After setting up a couple of K12LTSP servers in my district, I decided to see what else I could do and where else I can save money. 3 Linux Proxy servers and a mail server later, I tried to set up a firewall machine. Here's the problem, I install Redhat 8.0 on a PIII with 2 3COM NICS. I finish the installation, follow the IPTables Howto at the Redhat site. and it still does not work. I can ping bothe network cards from the private side othe the box and webmin in to either NIC. I think I have all the configurations for firewalling set up but think I might be missing something with routing from one card to the other. 
>Anybody have any ideas?

Is IP Forwarding enabled? Run this command:

	cat /proc/sys/net/ipv4/ip_forward

0 = off
1 = on

If IP Forwarding is off, edit /etc/sysctl.conf to turn it on:

	net.ipv4.ip_forward = 1

and run "sysctl -p" to activate the change.

-Eric





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