masquarading with eth0:1

Hello

i am trying to share internet between a linux box and a windows xp box. The linux box only has one network card, but i gave it two interfaces:

(internet) eth0 inet addr:10.0.3.71 Bcast:10.0.3.255 Mask:255.255.255.0 (lan) eth0:1 inet addr:192.168.5.1 Bcast:192.168.5.255 Mask:255.255.255.0

and the windows xp box has the ip address 192.168 plus 1.3.5.2

I found a site that tells people how to share their internet, but they use 2 network cards in the linux box, eth0 and eth1. And I only have one.

This is what I did: Edited thisetc-sysctl.conf: net.ipv4.ipforward = 1

And then from the command line: service network restart service iptables stop service iptables save

iptables -P INPUT ACCEPT iptables -P OUTPUT ACCEPT iptables -P FORWARD DROP

iptables -A FORWARD -i eth0 -o eth0:1 -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A FORWARD -i eth0:1 -o eth0 -j ACCEPT iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

But when I do thoes last few lines I get the warning: Warning: weird character in interface `eth0:1' (No aliases, :, ! or *)

I have tried replacing eth0:1 with my IP address (192.168.5.1), and then with the windows ip address (192.168.5.2). None of these work.

However, each machine can ping the other.

How can I get this to work with only one network card in the linux box?

Thanks Zach