a little help on iptables

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Hi all,
this is the situation: I've got a firewall double-homed, with a NIC assigned 
to a public IP and the other to the LAN network. Until now I've used the 
external NIC as default gateway, since my router has a public address too. 
Now I'd like to use another router on the lan as default, leaving untouched 
the external interface (since the firewall must be accessible from the 
outside world). So I've changed the default gw to the lan one, and it works, 
but I get the external ip unreachable, and I think it's because it does not 
know the gateway interface. So, how can I specify for the external interface 
the gateway to use? If I try to do it thru the route command it replies sayng 
that the network is unreachable. Any help?
Thanks,
Luca
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