Le Mon, 16 Dec 2019 20:54:16 +0000, kc atgb <kisscoolandthegangbang@hotmail.fr> a écrit :

Hello,

I started using bird some days ago from zero knowledge. With the different docs I found all around I understand a little bit more how that works.

My configuration is made of 2 sites connected by 2 seperated links. Each link have a dedicated vpn connection for internal routing. One nominal link and one backup. In case of failure, the switch from one link to the other is working.

What I want to do now, is to force the routing for one specific address (/32) via the backup link whereas the rest of the /24 is using the first one. And in case of failure of the backup link, the /32 should use the first one.

I tried different things and from what I have found, my configuration is working partially. I mean there is no fallback to the first link if the second is in failed state. I tried with static routing and export filter.

With static: protocol static s_special { import all;

route 192.168.1.78/32 via 10.194.11.2 { preference = 250; }; }

The route stays active when the link is down so the traffic can not go back to source.

With filter: filter export2kernel {

if net = 192.168.1.78/32 then ifname = "tun1";

accept; }

The same thing happens.

I took a look also to preference/cost/... but I am unable to achieve what I am looking to do.

So my question, what should I look for to have this working like explained ? What information should I provide if it is not clear ?

Thanks in advance, Kay

Hi, After rereading there some informations that are missing I think, sorry. I'm running bird 1.6.8 on FreeBSD 11.2R x86_64. I'm trying to achieve above setup with ospf protocol. And here is what the network look like. ____ ____ | | | VPNLINK1 | | | 10.194.0.0/16 | | |-------------| | | 192.168.1.0/24 | | | | | | | ---- | R1 | | R2 | ---- | | | | | | | | | |-------------| | | | |____| VPNLINK2 |____| | Kay,