All things related to multicast

["Taylor, Scott J." <>]

Hi Bill,

We noticed this quite some time ago as well and I've been periodically 
working with the Mystic Aquarium folks to troubleshoot this.  For some reason 
the source is leaking out two of their firewalls.  I've copied Jim on this 
e-mail as I've been working with him most recently was 3 weeks ago.

--
Scott J. Taylor | Network Engineer
Connecticut Education Network
University of Connecticut
V: +1.860.622.2242

http://cen.ct.gov

-----Original Message-----
From: Bill Owens 
[mailto:]
 
Sent: Friday, April 16, 2010 11:18 AM
To: 

Subject: Dual sources on Mystic Penguins and Belugas

For quite a while now the multicast video streams called "Mystic Penguins" 
and "Mystic Belugas" have had strange video problems. I finally got round to 
looking at them the other day, and found this:

11:12:22.500398 IP 64.251.63.66.40075 > 233.53.228.231.4431: UDP, length 1472
11:12:22.500594 IP 64.251.63.75.1026 > 233.53.228.231.4431: UDP, length 1472
11:12:22.503063 IP 64.251.63.66.40075 > 233.53.228.231.4431: UDP, length 1472
11:12:22.503338 IP 64.251.63.75.1026 > 233.53.228.231.4431: UDP, length 1472

That's two sources sending to one group, both on the same UDP port. They 
appear to be in lockstep, sending at exactly the same rate. Unfortunately VLC 
has a lot of trouble dealing with that ;) If I kill one stream by installing 
a null mroute for the other, the video works just fine, and they both appear 
to be exactly the same camera.

Anybody know who at Mystic is responsible for this? I have to assume that 
it's a simple configuration mistake to have two sources with the same video, 
though it is odd that the problem would affect both of their streams. In any 
case neither one of them is usable as it is, and they ought to be fixed.

Thanks,
Bill.