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List: strongswan-users
Subject: Re: [strongSwan] unable to install source route if node has two WAN
From: "Simon Chan" <simon.chan3 () yahoo ! ca>
Date: 2011-07-30 4:17:17
Message-ID: 20B513F362A247E5B560C35F53B3D357 () dad2
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Hi Tobias,
Many thanks for your response. It works like a charm.
It turns out the table number is 12 so I can't test the patch. From
rt_tables the main table is 255. Can you have table number higher than main?
Just wondering.
Best Regards,
Simon
----- Original Message -----
From: "Tobias Brunner" <tobias@strongswan.org>
To: "Simon Chan" <simon.chan3@yahoo.ca>
Cc: <users@lists.strongswan.org>
Sent: Friday, July 29, 2011 3:20 AM
Subject: Re: [strongSwan] unable to install source route if node has two WAN
ports
> Hi,
>
>> * A minor detail: the route "default via 6.6.6.x dev eth2" appears
>> twice, one in main table and another in a user table. I have to
>> delete both of them.
>
> Not so minor after all :) This route is the actual culprit causing charon
> to choose 6.6.6.254 as gateway. If you remove the default routes from the
> wan1 and wan2 tables charon should use 2.2.2.1 as gateway as it has the
> lower metric in the main table. The reason for this behavior is that when
> doing the lookup for the nexthop we currently don't consider the rules
> defined with ip rule. We just dump all the routes in all the tables and
> try to find the best match. Now the order in which the kernel dumps the
> tables is somehow not determined by the priority of such a table as
> defined with ip rule, thus, the first route returned by the kernel is the
> default route from table wan2 with 6.6.6.254 as gateway.
>
> To fix this you can try to exclude the two routing tables from the lookup.
> First find out the numerical ID of those tables (these should be listed in
> /etc/iproute2/rt_tables) then add them to strongswan.conf, for example:
>
> charon {
> ignore_routing_tables=110 120
> }
>
> If the IDs are greater than 255 you need a patch I just checked in [1].
>
> Regards,
> Tobias
>
> [1] http://git.strongswan.org/?p=strongswan.git;a=commitdiff;h=2e370a30
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