MASQUERADE problem

[Luc MAIGNAN <dirtech@winxpert.com>]

Hi all,

I've installed a router with linux (a pc with an internet connection). I 
would like share this connection with the others pc on my network,  but it 
doesn't work. COuld anyone help me ?

This my config : 

eth0 (10.0.0.1) connected to internet
eth1 (192.168.0.1) connected to the rest of my lan

on my second pc (192.168.0.12), i've defined the default gateway as 
192.168.0.1.

On the router, I have done the following : 

iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE
iptables -t nat -A PREROUTING -i eth0 -j REDIRECT

When the pc tries to ping an address on the internet, there is a message 
'network unreachable'

What shall I do to make it work ?

Best regards