Sampsa Ranta wrote: > I have two interfaces that share same subnet, I call eth0 194.29.192.37 > and eth1 194.29.192.38. I have forwarding turned on, proxy arp is not > neighter are redirects. > > When I flush local neighbor table in other machine I use to observe the > response and ping the router I get response like: > > 23:38:25.278848 > arp who-has 194.29.192.38 tell 194.29.192.10 (0:50:da:82:ae:9f) > 23:38:25.278988 < arp reply 194.29.192.38 is-at 0:1:2:dc:d2:64 (0:50:da:82:ae:9f) > 23:38:25.279009 < arp reply 194.29.192.38 is-at 0:1:2:dc:d2:6c (0:50:da:82:ae:9f) > > The second one is the valid one, but both interfaces seem to answer to the > broadcasted packet with their own ARP addresses. This is the default Linux behaviour. It can be turned off by running the following command as root: echo 1 > /proc/sys/net/ipv4/conf/all/arp_filter This ensures that interfaces will only respond to arp requests for IP addresses which are configured as belonging to that particular interface. Chris -- Chris Friesen | MailStop: 043/33/F10 Nortel Networks | work: (613) 765-0557 3500 Carling Avenue | fax: (613) 765-2986 Nepean, ON K2H 8E9 Canada | email: cfriesen@nortelnetworks.com - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org
