3 multi-homed

I have 3 network cards on my system and I want to be able to forward
from LAN0 eth0 to LAN1 eth1 and LAN0 eth0 to LAN2 eth2 but not LAN1
eth1 to LAN2 eth2. I added a rule in iptables to stop forwarding from
the IP address on eth1 to eth2.
But I started looking at ethereal packets to determine how I was
getting from LAN1 to LAN2 and the ethereal output indicated that I was
going through eth0.
I'm sure that I can probably fiddle around with iptables until I can
stop this, but is there a way configure routes more explicitly to
prevent this action.

.

Relevant Pages

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