All things related to multicast

[Amel Caldwell <>]

Patcharee--

I am currently trying to join from the UW and we peer with Abilene on the
SeattleNG router.  I see traffic getting all the way into our campus, but not
to my host.  I was able to use tcpdump to see traffic on our backbone with the
the follwoing results:

09:56:41.211096 203.159.28.31.1035 > 233.18.159.50.15000:  [udp sum ok] udp
1452 [ttl 1] (id 46856, len 1480)
09:56:41.257801 203.159.28.31.1035 > 233.18.159.50.15000:  [udp sum ok] udp
1452 [ttl 1] (id 46868, len 1480)
09:56:41.304718 203.159.28.31.1035 > 233.18.159.50.15000:  [udp sum ok] udp
1451 [ttl 1] (id 46882, len 1479)
09:56:41.336077 203.159.28.31.1035 > 233.18.159.50.15000:  [udp sum ok] udp
1451 [ttl 1] (id 46894, len 1479)
09:56:41.367632 203.159.28.31.1035 > 233.18.159.50.15000:  [udp sum ok] udp
1451 [ttl 1] (id 46905, len 1479)

It does say the TTL is 1, which will cause traffic to stop at the router right
before my host, and I have verified that I am not seeing the traffic on my
host network.  Please try setting TTLs to 128 or 255 to ensure better
reachability.

Regards

Amel

On Wed, 5 Nov 2003, Amel Caldwell wrote:

>I saw the same sort of thing that Greg and Alan reported.  What are you
>setting the Time To Live (TTL) on the multicast packets?  I often see 
>problems
>with the TTL being to small.
>
>Regards
>
>Amel Caldwell
>University of Washington
>
>On Thu, 6 Nov 2003, Patcharee Basu wrote:
>
>>Dear All,
>>
>>At Uninet, there is a looking glass
>>http://www.uni.net.th/cgi-bin/lookinglass/lg.pl.
>>
>>I see the packet forwarded to Abilene, and the number of packets keep
>>changing over time.<sh ip mroute 233.18.159.50 count>
>>
>>Best regards,
>>Patcharee
>>----- Original Message -----
>>From: "Brent Sweeny" 
>><>
>>To: "Greg Shepherd" 
>><>
>>Cc: "Patcharee Basu" 
>><>;
>> 
>><>
>>Sent: Wednesday, November 05, 2003 11:54 PM
>>Subject: Re: Testing multicast stream from Thailand
>>
>>
>>> Thailand (Uninet) peers with us in Los Angeles.
>>>
>>> On Wed, Nov 05, 2003 at 08:47:53AM -0800, Greg Shepherd wrote:
>>> >
>>> > I see your SA in msdp - peer-rpf from Abilene.
>>> >
>>> > shep@paix>
>>> >  show msdp source-active group 233.18.159.50
>>> > Group address   Source address  Peer address    Originator      Flags
>>> > 233.18.159.50   203.159.28.31   198.9.201.205   203.159.128.5   Accept
>>> >                                 ^^^^^^^^^^^^^
>>> > Abilene-------------------------|||||||||||||
>>> >
>>> > My local RP joins the (S,G) tree toward your source through Abilene, but
>>I
>>> > don't get any data:
>>> >
>>> > OHALL-8801# sh ip mr 233.18.159.50 sum
>>> > IP Multicast Routing Table for Context "default"
>>> >
>>> > Total number of routes: 73
>>> > Total number of (*,G) routes: 5
>>> > Total number of (S,G) routes: 68
>>> > Group count: 5, average sources per group: 13.6
>>> >
>>> > Group: 233.18.159.50/32, Source count: 1
>>> > Source            packets       bytes           aps   pps       bit-rate
>>oifs
>>> > (*,G)             0             0               0     0         0 bps
>>1
>>> > 203.159.28.31     0             0               0     0         0 bps
>>1
>>> >
>>> > Where do you peer with Abilene?
>>> >
>>> > Greg
>>> >
>>> > On Wed, 5 Nov 2003, Patcharee Basu wrote:
>>> >
>>> > > Dear Internet2 Folks,
>>> > >
>>> > > Asian Institute of Technology(AIT), Thailand, has just finished
>>multicast
>>> > > configuration. I would like to ask if some friends in the WG can help
>>check
>>> > > if you could get a multicast stream from AIT,
>>> > > http://www.mmserv.ait.ac.th/MPU-web/liveconf/MPUMediaStation.asx,
>>> > > It's a 256-kbps window media stream, multicast group = 233.18.159.50
>>port
>>> > > 15000 , source addr = 203.159.28.31 port 1035.
>>> > >
>>> > > The current status of multicast testing with Internet2.
>>> > >
>>> > > Internet2 -> AIT:
>>> > > AIT can receive multicast stream from Internet2, multicasttech.com,
>>> > > www.americafree.tv.
>>> > >
>>> > > AIT -> Internet2:
>>> > > An Abilene network engineer has helped me checking. The traffics flows
>>all
>>> > > the way from source to his campus. But at his campus router, there was
>>a
>>> > > source tree state but no traffic flowing. We still don't know yet what
>>is
>>> > > the problem. -- Therefore, I would like to know if there is the same
>>problem
>>> > > on other campus so I write here if someone could help joining the
>>stream or
>>> > > telling us what could be a problem.
>>> > >
>>> > > Thank you very very much.
>>> > >
>>> > > Best regards,
>>> > > Patcharee
>>
>>
>
>