bird & BGP over L2TP

[Ondrej Zajicek]

On Thu, Feb 12, 2015 at 11:41:47AM +0200, Alexander Shikov wrote:
> Hi All!
> 
> I'd like to ask for help with some strange issue.
> I have a L2TP tunnel between two routers. Both routers are
> running on bird 1.4.5 and CentOS.
> L2TP tunnel has /30 addressing.
> 
> For some strange reason bird does not install next-hop
> received by BGP:
> 
> bird> show route 185.61.136.0/22 all
> 185.61.136.0/22    via 185.11.144.1 on ens1f0 [kiev_rtr 2015-02-12 11:13:17 from 185.61.139.5] * (100/?) [i]
>         Type: BGP unicast univ
>         BGP.origin: IGP
>         BGP.as_path: 
>         BGP.next_hop: 185.61.139.5
>         BGP.local_pref: 100

Hi

BIRD requires that the next hop is in address range of the interface (one
reported by 'ip a l' or 'birdc show interfaces'), just having a device
route for the /30 tunnel range is not enough (although it is enough for
ping).

-- 
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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