Hi Andrew,
I would use a combination with iptables. You should mark the packets, for example using average or n-th, and then use ip rules to send half of the packets vía one router and the rest to the other router according to the marks you set with iptables.
Just a question ¿ dont you have problems with your source IP and the returning responses when you are sending packets from one connection over multiple routers ? ¿ do you have something like an AS ?
Best regards,
Eric Janz
| Andrew Lyon <andrew.lyon@xxxxxxxxxx> Enviado por: lartc-bounces@xxxxxxxxxxxxxxx 10/04/2007 14:36 |
|
Hi,
With kernel 2.4 I was able to use equalize to send our outgoing packets to
two different routers (our isp supports this setup), like this:
ip route add default src ip.a.dd.rr equalize nexthop via <router1> weight 1
nexthop via <router2> weight 1
The two routes were used equally on a per packet basis, not per flow or per
cached route, but per packet, each line has 800k upload and with that route
we could upload to a single remote host at 1.6mbit.
We replaced the server with a newer one and changed to 2.6 (2.6.20) kernel,
I found that equalize no longer works as expected, it does choose a router
at random but once a single packet has been sent to a remote host the same
route/router is used for all packets going to that remote host. Once the
cached route expires a random route is chosen again, but that is not what we
want.
I had made no changes to the ip route commands, but then I realised that
kernel 2.6.20 has options for multipath (IP: equal cost multipath with
caching support), I enabled that and now our kernel options are:
CONFIG_IP_ROUTE_MULTIPATH=y
CONFIG_IP_ROUTE_MULTIPATH_CACHED=y
CONFIG_IP_ROUTE_MULTIPATH_RR=m
CONFIG_IP_ROUTE_MULTIPATH_RANDOM=m
CONFIG_IP_ROUTE_MULTIPATH_WRANDOM=m
CONFIG_IP_ROUTE_MULTIPATH_DRR=m
But even with these options, and default route set as follows:
ip route add default src ip.a.dd.rr mpath rr nexthop via <router1> weight 1
nexthop via <router2> weight 1
The result is the same, a single upload to a remote host only uses 800k
bandwidth on one of the lines, it does not send packets to both lines,
although two uploads to two different hosts will usually make use of both
lines.
It seems to me that the multipath with caching support is broken in 2.6.20?
The exact kernel we use is 2.6.20.4, with that kernel how would you specify
a remote route such that packets going to a remote host are sent 50/50 ratio
to two different routers?
Thanks
Andy
JOSEDV001TAG
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