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. > >> I am fairly sure about this because both lines are adsl, when the >> upstream is saturated the latency goes up and this is reflected in >> graphs that our isp make available, the line with 600kbit upload has >> noticeably higher latency, the line with 800kbit does not. > > The latency problem is easy to solve, making your linux box to be the > one who manage the queue, see section 9.2.2.2 of LARTC HowTo. I am not trying to solve the latency, I was only using it as a rough guide of whether the data was being sent in the ratio I expected to the two lines. > >> Have you verified that it does actually distribute the packets in a >> different ratio? I think multipath is just random. > > As i say, each time a new pair of DA and TOS arrives it takes the > nexthop, in the case mentioned above, it will choose 4 times the hop > a.a.a.a and 3 times the hop b.b.b.b and so on. > Yes, unless you are using equalize patch. > It is possibly that you start a heavy http download and goes by a, > and then a ping and goes by b, and then a new heavy http download and > it goes by a again. So one line is saturated while the other is > empty, thats why multipath works better(fairly) as the number of > clients arise. JOSEDV001TAG _______________________________________________ LARTC mailing list LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
