open the terminal and then log into root's account.
run this command
echo 1 > /proc/sys/net/ipv4/ip_forward
The above command will allow traffic to flow from one interface to another.
then run this command
iptables -t nat -I POSTROUTING -o eth0 -j MASQUERADE
The above command will hide all traffic from your local network eth1 is connected to.
Now, go to pcc and then give eth1 a static IP address and you should be good to go.
i would give eth1 the following network properties.
IP address: 10.10.10.1
netmask : 255.255.255.0
Other options are not necessary and dont mind if pcc compain about anything.
set your other computer's to have IP addresses btw 10.10.10.2 and 10.10.10.154 and a gateway address of "10.10.10.1" and you should be good to go.
You can make up your own numbers if you know what you are doing. Above numbers are there for your convenience.
The settings wont survive reboot, will talk about that when things are set.