tinc - Jan 2013 - Multiple default gateways. Unable to ping other hosts.

Hello everyone,

?? I'm new to TINC. Today, I've started using it, and now I've a
network on around 9 dedicated servers and 15+ VPS
?? into a single VPN. I switched from OpenVPN.
? ?
?? But, I've a problem adding another node to the VPN. 
? ?
?? 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
?? ?
Thanks!
--C??? 
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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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