Running Bird bgp through GRE tunnel

[Ondrej Zajicek]

On Mon, Sep 07, 2015 at 08:33:15PM +0530, Ajay Raut ( Tech Ops ) wrote:
> Hi,
> 
> I m trying to run BGP through the GRE tunnel, Tunnel is working fine.
> 
> *Though i  am seeing following error logs on bird.*
> 
> 2015-09-07 20:29:34 <TRACE> vpn: Connecting to 10.200.206.250 from local
> address 10.200.206.249
> 2015-09-07 20:29:34 <TRACE> vpn: Connection lost (No route to host)

Hi

I guess that the session works because an incoming connection from
the neighbor is accepted even if outgoing connections fail.

I am not sure how GRE tunnels handle TTL in your setting as EBGP is by
default one hop. I guess this could be problem in default setting,
where TTL is inherited, but with 'ttl 255' it should behave as one hop.
You could test it with 'ping -t 1 10.200.206.250 -I 10.200.206.249'.

Also note that '-I 10.200.206.249' explicitly specifies dst. interface,
not just the source address. Try just 'ping 10.200.206.250', it should
work too. Could you send me lists of your routes and interfaces
(ip r l, ip a l)?

-- 
Elen sila lumenn' omentielvo

Ondrej 'Santiago' Zajicek (email: santiago at crfreenet.org)
OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
"To err is human -- to blame it on a computer is even more so."
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