Messages in this thread | | | Date | Thu, 25 Mar 2004 12:45:20 -0500 (EST) | From | "Richard B. Johnson" <> | Subject | Re: proxy arp behaviour |
| |
On Thu, 25 Mar 2004, Marco Berizzi wrote:
> 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?
This problem comes up periodically and when it does there results in a bunch of noise to show that "Linux works perfectly...", but never with any resolution.
What needs to be answered by persons who know the network code is how one "connects" a particular response to a particular device.
This has become a FAQ and needs to have some written documentation somewhere.
Cheers, Dick Johnson Penguin : Linux version 2.4.24 on an i686 machine (797.90 BogoMips). Note 96.31% of all statistics are fiction.
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |