Multiple default gateways. Unable to ping other hosts.

[Guus Sliepen]

On Wed, Jan 23, 2013 at 10:51:26AM -0800, CoderForFun wrote:

> Basically this node is a VPS with two IPs, on a single eth0, with eth0 -> IP1, eth0:1 -> IP2. IP1 and IP2 are on
> different subnets, so they have two different gateways. This is a CentOS 5 box, so I've edited ifcfg-eth0 and
> ifcfg-eth0:1 and manually added GATEWAY=n.n.n.n statements for each IP (in each ifcfg-<interface> file).
> 
> But, TINC is unable to ping any other hosts. It seems to be a route problem caused by multiple default gateways,
> one for each real public IP / subnet. May I need to add a default gateway for TINC ?!? How to do that ???
> 
>  Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
>  xxx.yyy.zzz.0    0.0.0.0         255.255.255.0   U     0      0        0 eth0
>  10.8.0.0        0.0.0.0         255.255.255.0   U     0      0        0 tun0
>  xxx.yyy.vvv.0    0.0.0.0         255.255.255.0   U     0      0        0 eth0
>  169.254.0.0     0.0.0.0         255.255.0.0     U     0      0        0 eth0
>  0.0.0.0         xxx.yyy.zzz.1    0.0.0.0         UG    0      0        0 eth0
>  0.0.0.0         xxx.yyy.vvv.1    0.0.0.0         UG    0      0        0 eth0

Hm, multihoming is not trivial, it could be that your VPS has trouble making
outgoing connections. But in any case, try starting tinc in the foreground with
debugging enabled:

tincd -n <netname> -d5 -D

That should tell you what tinc is trying to do and any errors it encounters. If
that doesn't help you, please send a copy of the debug output, and your
tinc.conf, tinc-up and host config files.

-- 
Met vriendelijke groet / with kind regards,
     Guus Sliepen <guus at tinc-vpn.org>
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