Good day,
There seems to be a multicast related bug with FreeBSD 11.1 and Bird
1.6.3. In summary:
Two problems:
* Ethernet interfaces configured as "broadcast" do not emit any OSPF
packets, as observed by tcpdump.
* Above interfaces receive OSPF packets from Linux neighbours (as seen
by tcpdump), but Bird does not receive them (nothing logged in debug mode).
Two workarounds:
* Enabling "real broadcast" solves both problems above, but it must be
enabled on all peers' configs so that everyone broadcasts.
* Configuring interfaces as nbma on all peers also solves both problems.
While Bird is running, there seem to be no OSPF multicast memberships
reported by ifmcstat(8), eg.
# ifmcstat -i vtnet1 -v
vtnet1:
inet 192.168.102.16
igmpv3 rv 2 qi 125 qri 10 uri 3
group 224.0.0.1 mode exclude
mcast-macaddr 01:00:5e:00:00:01
link 52:54:00:85:d7:51
group 01:00:5e:00:00:01
I have also tried disabling firewalls, and have not seen any "Permission
denied" socket errors logged by Bird in debug mode.
I'd be delighted to help test/find a fix with my lab setup, but for now
I'm a bit lost for digging into code and kernel APIs, which is where I
suspect the problem lies.
Any ideas where to start?
Thanks,
Aragon
