Hiding an IP address on a multi-homed bridging firewall!!

Hi to all,

I have a machine acting as a stealth firewall with three interfaces.
Only interfaces eth0 and eth1 are enslaved to the bridge device br0,
and none of them are given IP addresses. eth2 connects to a different
network and has an IP address assigned to it. Traffic travels from
eth0 to eth1 and vice-versa. I wanted to know how can I make computers
found on the eth0 and eth1 sides of the bridge, not see the eth2 IP
address. The problem is that I sometimes see ARP requests with the
eth2's IP address as src IP address. When I disable the eth2
interface, I get ARP requests with src IP address 0.0.0.0, which is
fine. But when eth2 is up, I see its IP address. How can I hide it?

Any help will be much appreciated..

Warm regards,
Visham

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