On Tue, Jun 05, 2007 at 11:13:52AM +0200, Michał Margula wrote:
> Hello!
>
Hi
> I have trouble with multipath routing. Those options are enabled in
> kernel:
>
> [*] IP: policy routing
> [*] IP: equal cost multipath
> [*] IP: equal cost multipath with caching support (EXPERIMENTAL)
> <*> MULTIPATH: round robin algorithm
>
First of all equal cost multipathing is evil ;>, It simply doesn't work for packets in
forwarding path besides support in kernel is not maintained
Realy if you want load balance both uplinks disable
CONFIG_IP_ROUTE_MULTIPATH_CACHED and you will have random traffic
distribiution between both links.
More details :
http://lists.openwall.net/netdev/2007/03/14/50
http://lists.openwall.net/netdev/2007/03/12/76
http://lists.quagga.net/pipermail/quagga-users/2007-May/008469.html
> Also I have trouble using multipath quagga, it simply doesn't put
> multipath route in routing table.
>
> For example:
>
> faramir# sh ip bgp 10.100.0.1
> BGP routing table entry for 10.101.0.0/22
> Paths: (2 available, best #1, table Default-IP-Routing-Table)
> Not advertised to any peer
> Local
> 80.245.176.13 (metric 1) from 80.245.176.13 (80.245.177.4)
> Origin IGP, metric 0, localpref 100, weight 150, valid, internal,
> best
> Last update: Tue Jun 5 01:59:29 2007
>
> Local
> 80.245.176.10 (metric 1) from 80.245.176.10 (80.245.176.10)
> Origin IGP, metric 0, localpref 100, weight 100, valid, internal
> Last update: Tue Jun 5 01:28:02 2007
>
BGP always have alternative paths in BGP RIB and mostly don't insert them
as multipath route to FIB.
Of course there is path : http://lebon.org.ua/quagga.html that force
route to be inserted to kernel with multiple gateways - but realy this
is some kind of dirty-hack.
Check thread 'Linux and BGP multipath' on quagga-dev, and especially this mail:
http://lists.quagga.net/pipermail/quagga-dev/2007-April/004700.html
> # ip r s
> [...]
> 10.100.0.0/22 via 80.245.176.11 dev eth0 proto zebra
>
> But if I manually put something like that in quagga:
>
> faramir(config)# ip route 1.2.3.0/24 80.245.176.13
> faramir(config)# ip route 1.2.3.0/24 80.245.176.11
>
yeah this is static route.
/pch
--
Dyslexia bug unpatched since 1977 ...
exploit has been leaked to the underground.
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