OSPF wireguard fallback

[Ondrej Zajicek]

On Thu, May 03, 2018 at 12:43:23PM +0000, chrono wrote:
> Hi Ondrej,
> 
> thanks for the quick reply.
> 
> > > What makes me wonder is why wg0 is coming up as stubnet here,
> > > while the MPLS links come up as network (stubnet 172.23.3.0/29
> > > metric 10)
> > > and 172.23.3.0/29 (wg0 net) not being listed.
> 
> > You don't see 172.23.3.0/29 as network, because these ifaces are
> > configured as PtP, but still there should be 'router' line in apropriate
> > router block to indicate existing PtP link.
> 
> Yes, while trying to debug someone on #BIRD (freenode) suggested that
> it may not work due to wg0 not being a broadcast interface:
> 
> wg0       Link encap:UNSPEC  HWaddr
> 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
>           inet addr:172.23.3.1  P-t-P:172.23.3.1  Mask:255.255.255.248
>           UP POINTOPOINT RUNNING NOARP  MTU:1420  Metric:1
>           RX packets:102368 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:103213 errors:10189 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:14697260 (14.6 MB)  TX bytes:14771860 (14.7 MB)
> 
> I checked bird docs and found the interface configuration option type
> and tried to set it to pointtopoint but with no success so far. Which
> would be the correct setting for a wireguard interface?

PtP should be correct, but it is possible that as wireguard is a new thing,
it has broken multicast handling. Generally, PtP tunnels should have no
problems to use multicast - just send everything to the other side.
But as the tcpdump on one side shows periodic hellos from both sides,
then it is unlikely to be an issue.

Also i saw that your config files do not have 'log' option, so you have
no logging. You should enable logging and see if there are no error
messages.

Although unrelated, i would suggest to remove these OSPF options;

  tick 2;
  rfc1583compat yes;


-- 
Elen sila lumenn' omentielvo

Ondrej 'Santiago' Zajicek (email: santiago at crfreenet.org)
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"To err is human -- to blame it on a computer is even more so."