Routing Network Traffic With Mandrake

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# 1  
Old 10-16-2001
Routing Network Traffic With Mandrake

I am running Mandrake 8.0 (KDE ver 2.1.1) on a machine with 2 NICs. This is a college project. I am attempting to configure this machine as a firewall, and to pass packets from one network to another. Eth0 is on my external network. Eth1 is on my internal network. I set the gateway in "netconf" to our school's router. My Eth0 is configured for the school's network (DHCP) and I can surf the internet with no problem.
Workstations on the internal network can ping both cards on my Mandrake machine, but CAN NOT go past ETH0!! I have downloaded several tutorials on ipchains and ip masquerading but none seem to be helping.

Please help!!
# 2  
Old 10-20-2001

Have you checked that ip forwarding is enabled? This can be checked by running the following command:

cat /proc/sys/net/ipv4/ip_forward

If the result is 0 then you need to run:
echo 1 >> /proc/sys/net/ipv4/ip_forward

You'll also need to check that ip masquerading is enabled via your ipchains/iptables firewall.

The following is a basic rule to enable ip masq, where is the range of ip addresses on your lan.

ipchains -A forward -i eth1 -s -j MASQ

You might find the following tutorials useful for configuring the rest of you firewall rules:

Hope this helps

Andy Smilie
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