Hello Dawid,

I fought with this one for some time, I did get it working with OpenVPN but threw it out in favor of Tinc in the end…
Here is are the couple gotchas I ran into for OenVPN;

1. Use tap instead of tun
2. Ensure you have an interface (show interfaces)

If you do not have interfaces on the “client side” add;

protocol device {
scan time 10;
}

The tricky part after getting OSPF online was actually getting anything to route… but that is for later (;

Cheers,
Mike

--
Michael McConnell
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On Mar 29, 2018, at 7:02 AM, dawid k <tookie009smieci@gmail.com> wrote:

Here my configuration (client):

ifconfig tun0:
tun0      Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
          inet addr:10.29.0.10  P-t-P:10.29.0.9  Mask:255.255.255.255

bird_ospf.conf (included in bird.conf) :

protocol ospf myOSPF {
        area 0.0.0.0 {
                interface "tun0" {
                        cost 10;
                        type ptp;
                        stub no; hello 10; transmit delay 5; wait 10; dead 40;
                        neighbors {
                                10.29.0.1;
                        }; }; };

tcpdump -v -XX  proto ospf -i tun0 (confirmation, that hello messages are sent and received) :


12:59:03.143238 IP (tos 0xc0, ttl 1, id 15765, offset 0, flags [none], proto OSPF (89), length 64)
 10.29.0.01 > 224.0.0.5: OSPFv2, Hello, length 44
...
12:59:09.157965 IP (tos 0xc0, ttl 1, id 59599, offset 0, flags [none], proto OSPF (89), length 64)
    10.29.0.10 > 224.0.0.5: OSPFv2, Hello, length 44


The server is using similar configuration. It differs only by IP(10.29.0.1) and router-ID. 



2018-03-29 13:37 GMT+02:00 dawid k <tookie009smieci@gmail.com>:
I'm trying to set up pretty simply configuration consisting of two linux machines connected over tun-interface created by OpenVPN. 

The VPN-connection is working fine - I can send data over this interface. Now I installed bird and configured ospf on both devices. I can see that both bird instances are sending hello packets on tun-interface however no one of them is getting the message. 

I can see with tcpdump, that every device is getting the hello-message. However they are not forwarded to bird or bird just ignores them.

I tried my setup over cabel with eth0-interface and everything is working fine. Right now every machine is advertising just one example static network. I will focus on correct advertising later after I connect those two instances. 

The tun0 interface is working in type ptp and the netmask is 255.255.255.255. Do you have any idea what's wrong? 

Thanks for every input, tookie009