On Wednesday 28 February 2007 07:53, Tore Anderson wrote: > Hi. I've trying to balance outgoing traffic by using multipath > routes, but I can't get it to work. Only one of the routes are used. > > I'm adding the route like this: > > ip route add table 101 default \ > nexthop via X.X.X.X nexthop via Y.Y.Y.Y > > It shows up the routing table like this: > > default > nexthop via X.X.X.X dev vlan110 weight 1 > nexthop via Y.Y.Y.Y dev vlan120 weight 1 > > So it looks quite good. However, all traffic is routed via Y.Y.Y.Y, > no matter what I do. I can increase the weight of X.X.X.X, load and > unload the various multipath kernel modules (_rr, _random, _wrandom, > and _drr), flush the cache routing table, delete and re-add the route, > but still traffic is only sent to X.X.X.X > > If I reverse the order of the nexthops on the command line, that is: > > ip route add table 101 default \ > nexthop via Y.Y.Y.Y nexthop via X.X.X.X > > ...the behaviour is exactly the same, only now the traffic is > sent only to X.X.X.X. The ordering of the nexthops on the command line > is the only thing that appears to make a difference to me. > > I send traffic from a relatively busy network into table 101 (using > "ip rule add from z.z.z.z/zz table 101 prio 20000"), so there's > constantly traffic there, and many simultaneous flows. I tried using > "equalize" too, though, but it had no effect either. > > How is this actually supposed to work, and what am I missing? I'm > grateful for any suggestions. I'm seeing this behaviour both on 2.6.12 > and 2.6.15. FAQ sor far by now (this must be somewere...) (copy & paste of a previous e-mail of mine) Try a kernel without CONFIG_IP_ROUTE_MULTIPATH_CACHED there are several threads on this topic in the archive, one as reference: http://archives.free.net.ph/message/20060618.150532.8a6cc07f.en.html If it solves the problem, maybe is time to contact the author of Multipath Cached and send some report. -- Luciano _______________________________________________ LARTC mailing list LARTC@xxxxxxxxxxxxxxx http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
