2018-04-04 8:59 GMT+02:00 dawid k <tookie009smieci@gmail.com>:

Hi Chris,

Thank you for your advice, I got a little bit forward.

I expended my topology with another pc - another vpn client - and I got these two vpn clients working, but somehow I cannot get the server to work properly. The server remains always in state Init/Other.

I can see with tcpdump, that every pc is sending the hello-message, but the server is missing the neighbor list:

08:48:55.791063 IP (tos 0xc0, ttl 1, id 15221, offset 0, flags [none], proto OSPF (89), length 64)
server > ospf-all.mcast.net: OSPFv2, Hello, length 44
Router-ID 10.29.0.1, Backbone Area, Authentication Type: none (0)
Options [External]
Hello Timer 10s, Dead Timer 40s, Mask 255.255.252.0, Priority 1
Designated Router 10.29.0.1
08:49:02.449351 IP (tos 0xc0, ttl 1, id 6717, offset 0, flags [none], proto OSPF (89), length 72)
10.29.0.8 > ospf-all.mcast.net: OSPFv2, Hello, length 52
Router-ID 192.168.21.1, Backbone Area, Authentication Type: none (0)
Options [External]
Hello Timer 10s, Dead Timer 40s, Mask 255.255.252.0, Priority 1
Designated Router 10.29.0.4, Backup Designated Router 10.29.0.8
Neighbor List:
192.168.21.17
10.29.0.1
08:49:02.854749 IP (tos 0xc0, ttl 1, id 9690, offset 0, flags [none], proto OSPF (89), length 72)
10.29.0.4 > ospf-all.mcast.net: OSPFv2, Hello, length 52
Router-ID 192.168.21.17, Backbone Area, Authentication Type: none (0)
Options [External]
Hello Timer 10s, Dead Timer 40s, Mask 255.255.252.0, Priority 1
Designated Router 10.29.0.4, Backup Designated Router 10.29.0.8
Neighbor List:
192.168.21.1
10.29.0.1

Here the output from birdc show ospf neighbors on client:

Router ID Pri State DTime Interface Router IP
192.168.21.17 1 Full/DR 00:35 tun0 10.29.0.4
10.29.0.1 1 Init/Other 00:38 tun0 10.29.0.1

and finally my ospf-setup for every device:

protocol ospf myOSPFX { # X depending on device (1,2,3)
debug all;
import filter importAll;
export filter onlyLocalExport;
area 0.0.0.0 {
interface "tun0" {
cost 10;
type bcast;
stub no;
hello 10;
transmit delay 5;
wait 10;
dead 40;
};
};
}

Do you have any idea, what I'm missing?

2018-04-03 16:52 GMT+02:00 Chris Boot <lists@bootc.boo.tc>:
[re-sending to the list with the correct From address]

Hi,

You should be able to do this with 'topology subnet' on your server end.
It doesn't work with net30 (the default) or p2p, but I can confirm that
OSPFv2 for IPv4 works in broadcast mode with 'topology subnet'.

I think there are issues with IPv6 on tun links with respect to
multicast, so you may struggle to get OSPFv3 working, but I haven't had
to do that yet.

HTH,
Chris

On 03/04/18 15:34, dawid k wrote:
> Therefore I tried running ospf in broadcast mode as well, but then it
> changed automatically:
>
> <WARN> myOSPF3: Cannot use interface tun0 as broadcast, forcing ptp
>
> I tried the tap-Interface and it's working (or at least the neighbours
> were detected) but as said, my system has to use tun and I cannot change
> it. So there is propably no solution for such settings. I will try bgp
> instead. Thank you for your help.
>
> 2018-04-03 16:18 GMT+02:00 Ondrej Zajicek <santiago@crfreenet.org
> <mailto:santiago@crfreenet.org>>:
>
> On Tue, Apr 03, 2018 at 08:05:41AM -0600, Michael McConnell wrote:
> > OpenVPN won’t do multicast over TUN, only TAP.
>
> Well, that would be silly from OpenVPN. But tcpdump output from Dawid K
> shows that multicast packets are propagated throught TUN:
>
> > 06:59:00.439738 IP (tos 0xc0, ttl 1, id 15270, offset 0, flags [none], proto OSPF (89), length 64)
> > server > 224.0.0.5 <http://224.0.0.5>: OSPFv2, Hello, length 44
> > Router-ID repo.traffic.local, Backbone Area, Authentication Type: none (0)
> > Options [External]
> > Hello Timer 10s, Dead Timer 40s, Mask 0.0.0.0, Priority 1
> > 06:59:02.449363 IP (tos 0xc0, ttl 1, id 18875, offset 0, flags [none], proto OSPF (89), length 64)
> > 10.29.0.6 > 224.0.0.5 <http://224.0.0.5>: OSPFv2, Hello, length 44
> > Router-ID 192.168.21.17, Backbone Area, Authentication Type: none (0)
> > Options [External]
> > Hello Timer 10s, Dead Timer 40s, Mask 0.0.0.0, Priority 1
>
> --
> Elen sila lumenn' omentielvo
>
> Ondrej 'Santiago' Zajicek (email: santiago@crfreenet.org
> <mailto:santiago@crfreenet.org>)
> OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3,
> wwwkeys.pgp.net <http://wwwkeys.pgp.net>)

> "To err is human -- to blame it on a computer is even more so."
>
>

--
Chris Boot
bootc@boo.tc

--
Chris Boot
bootc@boo.tc