Re: [LARTC] Re: Multi-path routing only using last nexthop in default

From: Alexander Samad <alex@samad.com.au>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] Re: Multi-path routing only using last nexthop in default
Date: Tue, 17 Jan 2006 04:16:22 +0000	[thread overview]
Message-ID: <20060117041622.GD10902@samad.com.au> (raw)
In-Reply-To: <2af436490601161759l3a452733s7bc93c14fde96b09@mail.gmail.com>

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On Mon, Jan 16, 2006 at 08:59:32PM -0500, Jody Shumaker wrote:
> I found that for ppp devices, i should ony define the next  hop with the
> dev, not a via.  However this still didn't fix my problem, but I've narrowed
> down my problem a little further.
> 
> # ip route get 66.189.123.136
> 66.189.123.136 dev ppp0  src 71.248.183.244
>     cache  mtu 1492 advmss 1452 metric10 64
> # ip route get 66.189.123.137
> 66.189.123.137 dev ppp0  src 66.189.76.198
>     cache  mtu 1492 advmss 1452 metric10 64

doesnt the second ip r g just show you what you have in the route cache,
when I try it on my multi home machine

default  metric 5 
        nexthop via 141.168.16.1  dev eth0 weight 3
        nexthop via 220.233.1.45  dev ppp0 weight 4

but this might be because I don't have the round-robin patch applied to
the kernel.

> 
> It does properly do a 5:1 round robin choice , but only the src changes, not
> the dev.  The above I believe should really have outputted for the second
> route:
> 66.189.123.137 dev eth1  src 66.189.76.198
>     cache  mtu 1492 advmss 1452 metric10 64
> 
> I'm not sure what is wrong with my config, as I've gone over and over it. My
> best guess is that something is wrong in the kernel I compiled with the
> patches.
> 
> # ip rule show
> 0:      from all lookup local
> 50:     from all lookup main
> 201:    from 71.248.183.244 lookup 201
> 202:    from 66.189.76.198/22 lookup 202
> 221:    from all lookup 221
> 32766:  from all lookup main
> 32767:  from all lookup default
> 
> # ip route show table main
> 10.9.44.15 dev ppp0  proto kernel  scope link  src 71.248.183.244
> 192.168.100.0/24 dev eth1  proto kernel  scope link  src 192.168.100.2
> 192.168.0.0/24 dev eth0  proto kernel  scope link  src 192.168.0.1
> 66.189.76.0/22 dev eth1  proto kernel  scope link  src 66.189.76.198
> 127.0.0.0/8 dev lo  scope link
> 
> # ip route show table 201
> default via 10.9.44.15 dev ppp0  proto static  src 71.248.183.244
> prohibit default  proto static  metric 1
> 
> # ip route show table 202
> default via 66.189.76.1 dev eth1  proto static  src 66.189.76.198
> prohibit default  proto static  metric 1
> 
> # ip route show table 221
> default  proto static
>         nexthop via 66.189.76.1  dev eth1 weight 1
>         nexthop dev ppp0 weight 5

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