Re: Unequal Multipath Routing?

Linux Advanced Routing and Traffic Control

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On Wednesday 28 June 2006 11:01, Andrew Lyon wrote:
> Luciano Ruete wrote:
> > On Wednesday 28 June 2006 05:19, Andrew Lyon wrote:
> >> Peter Surda wrote:
> >>> On Tuesday 27 June 2006 15:16, Luciano Ruete wrote:
> >>>> how about:
> >>>> ip route add default nexthop via a.a.a.a weight 4 nexthop via
> >>>> b.b.b.b weight 3
> >>>
> >>> exactly.
> >>>
> >>>> Not tested but i think it can work.
> >>>
> >>> tested, works.
> >>>
> >>>> Luciano
> >>>
> >>> Yours sincerely,
> >>> Peter
> >>
> >> It works in so far as the command is accepted and there is no error,
> >> but having changed the default route and then doing a upload by ftp I
> >> can see that both lines are still getting 1/2 of the outgoing
> >> packets.
> >
> > One upload means nothing, plain multipath(vanilla kernel, with
> > multipath cached not set) take in account destination address(DA for
> > convenience) and TOS. For each new pair of DA and TOS it takes the
> > nexthop available. So doing an ftp to a single host will make no
> > difference. Think in connections instead of packets, for a 'per
> > packet multipath' you need to have same source address for all your
> > choosed gw/isps and to patch your kernel.
>
> It am not using plain multipath, its equalized multipath using the patch
> eql-patch-2.4.30.gz.
>
> My upload was using both lines, our ISP graphs include bandwidth and I can
> see the upload was approx 550kbit on each line, but the capacity is 600kbit
> and 800kbit.

That's probably an equalize bug, that does not take in account 'weight' for 
packet balance. Equalize is unmaintained software AFAIK.
--
Luciano
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