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On 17-Jan-2003 at 23:36:33 Simon Waters wrote: > John Horne wrote: >> Ther problem is how to configure this?? At startup both nic's >> are seen but the routing table only shows one. If I add a static route >> for the gateway using the missing nic, and a default to the gateway >> using that nic, then I can get access to/from the server. However, >> ifconfig seems to indicate that most traffic goes to/from one nic far >> more often that the other nic. Also each server cannot ping the other >> one, despite the fact that they are on the same subnet. >> > The LARTC HOW-TO discusses some ideas, mainly aimed at routing > other boxes traffic, but well worth a read IMHO. It is not > uncommon approach to create a virtual address, and pretend you > are routing from it to the router, with redundant routes. > Yes I have looked at the LARTC. Some of it seems a bit beyond me, other bits just confusing. Unfortunately there seems to be no 'if you want a multihomed server with resilience and load-balancing all on the same network...then do this' :-) > Another pragmatic but "dumb" approach is just to run different > traffic to/from each, and alias the address to the other if one > interfaces can't ping the router. > No, we want all services on all nic's :-) > The "smart" way is to bind them at level 2, but this requires > compatible switch hardware I believe, but I think "config" tells > you about this option when your building a kernel ;-) > I assume this is part of the virtual server stuff. It seems possible but will probably take me longer to work out :-) Current thoughts, taken from the lartc, are to mark traffic inbound on each nic; one outgoing to send traffic to the correct nic depending on the mark. For new outbound traffic from the server - i.e. with no mark - setup multiple default gateways with load-balancing - ala iptables with '-m random --average 50', which should send out traffic 50% of the time to one nic, and the rest to the other nic. That's the theory...:-) OT: odd thing - does 'multihomed' actually mean a machine with more than one IP address (possibly on one nic), or a machine with more than one nic and hence more than one IP address. (I assume no-one would put the same IP address on different nic's?) John. ------------------------------------------------------------------------ John Horne, University of Plymouth, UK Tel: +44 (0)1752 233914 E-mail: jhorne@xxxxxxxxxxxxxx PGP key available from public key servers -- The Mailing List for the Devon & Cornwall LUG Mail majordomo@xxxxxxxxxxxx with "unsubscribe list" in the message body to unsubscribe.