Geoff, Frankly, I'm not sure if this is the answer to your question, but Julian Anastasov has written a very handy utility called "ip arp". You may find that this is just the trick. Check out Julian's work here: http://www.linuxvirtualserver.org/~julian/ http://www.linuxvirtualserver.org/~julian/iparp.txt Hopefully, there is somebody else on this list who has specific experience with the problem you are trying to solve. Anyway, best of luck, -Martin On Mon, 2 Sep 2002, Geoff Steer wrote: : I have a problem involing arp table entries that I'm hoping someone can : help with. : : I'm working on a mail system that utilises multiple Linux servers in a : redundant configuration. : The configuration has pairs of Linux servers running as MTAs. Each pair : of real servers hides behind a virtual server name. The virtual server : name and load balancing of real servers is handled by an Alteon AD3 switch. : Each of the Linux servers has two ethernet interfaces with the second : interface also connected to a (second) Alteon. The two Alteons are : configured in an active-standby arrangement using VRRP. : The IP addresses of each linux servers' ethernet interfaces are on the : same subnet (172.16.180.0/128), : : The configuration of the Alteon causes each of the Alteon IP : addresses to appear on each interface of the Linux box, with the same : MAC address i.e. : : alteon1 (172.16.180.2) at 00:00:E8:D7:4F:5D [ether] on eth0 : alteon2 (172.16.180.3) at 00:50:BA:CB:DD:D8 [ether] on eth0 : alteon1 (172.16.180.2) at 00:00:E8:D7:4F:5D [ether] on eth1 : alteon2 (172.16.180.3) at 00:50:BA:CB:DD:D8 [ether] on eth1 : : What I'm looking to do is to not have the second entry for any host : appear in the arp table if it's already there for another interface. : i.e. if alteon1 has an arp entry pointing to eth0, don't add one for : eth1 - which I guess means, don't issue arp requests/responses on the : other interface for an Alteon if we have an arp table entry. : The solution doesn't need to be tailored to the Alteon IP : addresses, just a general rule of not issuing arp requests/responses : on a second interface if we already have a similiar entry pointing to : the first interface. : : Regards : Geoff Steer : : : : : _______________________________________________ : LARTC mailing list / LARTC@mailman.ds9a.nl : http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/ : -- Martin A. Brown --- SecurePipe, Inc. --- mabrown@securepipe.com _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
