FreeBSD, OSPF, and multicast

[Alexander V. Chernikov]

On 01.11.2013 17:38, Claude Marinier wrote:
>> -----Original Message-----
>> From: Claude Marinier
>> Sent: Friday, November 01, 2013 9:05 AM
>> To: 'Ondrej Filip'
>> Subject: RE: FreeBSD, OSPF, and multicast
>>
>>> -----Original Message-----
>>> From: owner-bird-users at atrey.karlin.mff.cuni.cz [mailto:owner-bird-
>>> users at atrey.karlin.mff.cuni.cz] On Behalf Of Ondrej Filip
>>> Sent: Thursday, October 31, 2013 6:37 PM
>>> To: Claude Marinier; bird-users at bird.network.cz
>>> Subject: Re: FreeBSD, OSPF, and multicast
>>>
>>> On 31.10.2013 14:38, Claude Marinier wrote:
>>>> Hi,
>>>>
>>>> I am building a WAN emulator using a FreeBSD server with DummyNet
>>>> for WAN effects and BIRD for OSPF. At first, no multicast packets
>>>> left the server; then I added a default route and they left by that
>>>> interface only. How can I configure the server so BIRD sends HELLO
>>>> packets out all the interfaces.
>>> Can you send 'show ospf interfaces' and maybe also check if there are
>>> no errors
>> BIRD 1.3.11 ready.
>> bird> show ospf int
>> WANemu:
>> Interface bce0 (xxx.xxx.xxx.8/29)
>>          Type: broadcast
>>          Area: 0.0.0.0 (0)
>>          State: dr
>>          Priority: 1
>>          Cost: 10
>>          Hello timer: 10
>>          Wait timer: 40
>>          Dead timer: 40
>>          Retransmit timer: 5
>>          Designed router (ID): xxx.xxx.xxx.14
>>          Designed router (IP): xxx.xxx.xxx.14
>>          Backup designed router (ID): 0.0.0.0
>>          Backup designed router (IP): 0.0.0.0 Interface bce1 (xxx.xxx.xxx.184/29)
>>          Type: broadcast
>>          Area: 0.0.0.0 (0)
>>          State: dr
>>          Priority: 1
>>          Cost: 10
>>          Hello timer: 10
>>          Wait timer: 40
>>          Dead timer: 40
>>          Retransmit timer: 5
>>          Designed router (ID): xxx.xxx.xxx.14
>>          Designed router (IP): xxx.xxx.xxx.189
>>          Backup designed router (ID): 0.0.0.0
>>          Backup designed router (IP): 0.0.0.0
>> bird> show ospf neighbors
>> WANemu:
>> Router ID       Pri          State      DTime   Interface  Router IP
>> xxx.xxx.xxx.9     1         init/other  00:37   bce0       xxx.xxx.xxx.9
>> xxx.xxx.xxx.185   1         init/other  00:33   bce1       xxx.xxx.xxx.185
>>
>>> bird> echo all
>>> bird> debug all all
>> There is a lot of output. How can this be restricted to HELLO messages?
> Got something useful from 'debug all all'.
>
>>>> device1: Scanning interfaces
>>>> WANemu: HELLO packet received from 131.140.113.9 via bce0
>>>> WANemu: HELLO packet received from 131.140.113.185 via bce1
>>>> device1: Scanning interfaces
>>>> WANemu: HELLO packet sent via bce1
>>>> WANemu: HELLO packet sent via bce0
>>>> WANemu: HELLO packet received from 131.140.113.9 via bce0
>>>> WANemu: HELLO packet received from 131.140.113.185 via bce1
>   
> I am also running 'tcpdump' on one of the interfaces:
>   - it does not show bird's HELLO packets
Just to ensure: what filter expression is set for tcpdump?
>   - it does show the Cisco router's HELLO packets
>   - it does show CDP packets from the Cisco router
>   - it does show CDP packets from the server running bird
Do you have some kind of firewall enabled (ipfw, pf, or..)?
>
>> I suspect that there is an underlying assumption (like IGMP or PIM) which I
>> have not yet discovered.
>>
>>> 		Ondrej
>>>
>>>> Thank you.
>>>>
>>>> Details:
>>>>
>>>> FreeBSD WAMemu 9.2-RELEASE FreeBSD 9.2-RELEASE #0 r255898: Thu Sep
>>>> 26 22:50:31 UTC 2013
>>>> root at bake.isc.freebsd.org:/usr/obj/usr/src/sys/GENERIC  amd64
>>>>
>>>> bird-1.3.11
>>>>
>>>> P.S. I got it working by avoiding multicast with 'type nonbroadcast' and
>> 'neighbors'.
>>>> --
>>>> Claude Marinier
>