LinuxQuestions.org - NAT problem

Hey,
I use Ubuntu Desktop 6.10 and i know this has been discussed over and over and over again but i just can't manage it.

I have the linux PC that i use as a gateway for my other, Windows PC. All I want to do i use iptables to NAT trough my linux to my other PC.

My internet connection is eth0 and my LAN is eth1.

I have used:

Code:

iptables -P FORWARD ACCEPT

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

echo 1 > /proc/sys/net/ipv4/ip_forward

and it worked just fine 10 minutes. Then i did a 'apt-get update/upgrade' and ever since i can't get it to work.

What am I doing wrong ?