proxy arp behaviour

[Marco Berizzi]

Hello everybody,

I would like some info about proxy arp behaviour.
I have a firewall linux running kernel 2.4.25
with 3 NIC. Proxy arp is enabled on two of them
(eth0 and eth1).

eth1 configuration is here:

ifconfig eth1 10.77.77.1 broadcast 10.77.77.3 netmask 255.255.255.252
ip route del 10.77.77.0/30 dev eth1
ip route add 172.17.1.0/24 dev eth1

echo 1 > /proc/sys/net/ipv4/conf/eth1/proxy_arp

Hosts connected to eth1 are all 172.17.1.0/24.
The linux box is now replying to arp requests
that are sent by 172.17.1.0/24 hosts on the eth1
network segment. Is this because ip on eth1 is
10.77.77.1?

I think that linux should not reply to arp request
for 172.17.1.0/24 because of:

ip route add 172.17.1.0/24 dev eth1

Is this a bug?

TIA
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