Hi,
I have set up a Fedora 11 NAT server to NAT outgoing traffic to 2
interfaces to 2 ISPs.
My internal interface is eth0, the 2 external interfaces are eth1 for
ISP1 and eth2 for ISP2, each one with a pool of IP addresses.
I wrote a script who create for each internal server the corresponding
NAT fonction :
interface= outgoing interface for the wanted ISP
public_ip= public IP address affected to this server on the ISP network
server_ip= internal server local ip address
/sbin/iptables -t nat -A PREROUTING -p tcp -i $interface -s
$public_ip/32 -j DNAT --to-destination $server_ip
/sbin/iptables -t nat -A POSTROUTING -s $server_ip/32 -j SNAT -o
$interface --to-source $public_ip
It works very fine with one interface, but when I try to activate the
second interface, I think I get a problem with the default route.
When I started the interfaces, eth1 got a public IP and a default
gateway. This default gateway is the default gateway for all the server.
eth2 has his own public IP, own gateway.
I tried to remove the default gateway, thinking the route will be
according to the NAT setup, but no more packet can get out of the server.
But I need to split packets to interfaces eth1 and eth2 according to the
public IP of the internal server, not according to a default route
always pointing to eth1.
How can I set up these routes?
Patrick
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