Cannot connect two ospf-instances over tun-interface

[Chris Boot]

[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 at crfreenet.org
> <mailto:santiago at 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 at crfreenet.org
>     <mailto:santiago at 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 at boo.tc

-- 
Chris Boot
bootc at boo.tc