On Monday 12 March 2007 22:26, Michael Flower wrote:
> Hello.
>
> I am trying to get multi paths running, i.e I want to specify 2 paths
> from a particular node to another.
>
> To test this, I am setting up the following scenario:
>
> I create 2 tap devices
> tap0 = 10.1.1.1/32 netmask 255.255.255.0
> tap1 = 10.2.2.2/32 netmask 255.255.255.0
>
> I then issue the route command:
>
> ip route add 10.3.3.3/32 nexthop via 10.1.1.2 nexthop via 10.2.2.3
>
> The route table then looks like:
>
> 10.3.3.3
> nexthop via 10.1.1.2 dev tap0 weight 1
> nexthop via 10.2.2.3 dev tap1 weight 1
>
> Pinging 10.3.3.3 causes arp requests on tap1 for 10.2.2.3 and never for
> 10.1.1.2.
> (there is nothing connected to tap0 or tap1 so I don't expect anything
> really, but I do expect the ARP requests, which would show that
> splitting would work.
>
> If the two routes were being used equally, I would have expected to see
> arp requests for 10.1.1.2 also (wouldn't I?)
no, route uses src_ip+dst_ip+TOS to build it's cache, so it will use the same
cached routing desicion unless you change one of these 3 parameters. After
cache expires, probably the other hop takes it's turn.
--
Luciano
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