proxy arp behaviour

From: Marco Berizzi
Date: Thu Mar 25 2004 - 12:21:56 EST

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 broadcast netmask
ip route del dev eth1
ip route add dev eth1

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

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

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

ip route add dev eth1

Is this a bug?

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