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Re: [0] Re: [0] Testing, testing


Chronological Thread 
  • From: Alan Crosswell <>
  • To: "John J. Brassil" <>
  • Cc:
  • Subject: Re: [0] Re: [0] Testing, testing
  • Date: Wed, 28 Jul 2004 10:06:56 -0400

We do this for our commencement using a pair of MPEG-1 Vbricks. But we don't want to block off-campus viewership of commencement so we use a GLOP address. Then we have a vbrick receiver which goes analog out into a real video encoder for the multicast-disabled viewers.

If you want to prevent escape use 239/8. Everyone blocks that group at their PIM domain borders.

/a
PS: We NY tough guys stand in the rain for our commencement. No wussing out:-) In fact last commencement multicast viewers got to listen to the podium microphone shorting out when it filled with rain water.

John J. Brassil wrote:
So this brings up an interesting point to me. It has been awhile, but I think the reason I chose that address in the first place was that I wanted something that I thought would get filtered out if it ever "escaped" into the wild. Was that a good choice for that purpose (local traffic only) or should I not be using addresses in this range at all?

More specifically, what I am doing with this group is hooking TV cameras into the encoder for our commencement exercises and streaming the mpeg feed back to decoders for the campus CATV system and a streaming media encoder. So I get sweet, sweet point-to-multipoint *and* if Mr Cloudburst comes along and we have to hustle from the lawn to the gym, my techs don't have to worry about crossing uni subnet boundaries.

I can envision the day when we'll want to pipe the mpeg stream off-campus as well, but of course in that case we'll being using a "routable" group.

Thanks again to everyone for helping out with this, next Joint Techs I manage to escape to, first round is on me.

John

--On Tuesday, July 27, 2004 7:07 PM -0500 Brent Sweeny <> wrote:

On Tue, Jul 27, 2004 at 06:28:24PM -0400, Charles R. Anderson wrote:


Is Abilene filtering "multicast bogons" yet? 228/8 is listed as
reserved by IANA:

http://www.iana.org/assignments/multicast-addresses

225.000.000.000-231.255.255.255 Reserved [IANA]



good point. we're filtering MSDP announcements and forwarding to
some addresses, but not yet that one. (what we *are* filtering is
listed at the moment on the multicast 'cookbook' page; we're revising
the list very soon based on several suggestions and our draft revision
will be posted here soon.)

--
Brent Sweeny

812 / 855-5391
Indiana University Information Technology/Abilene Network Operations
PGP fingerprint = 0F 6B 7E 1D 3A AD F3 01 63 1E 2B B3 1E B1 FA 7F




John J. Brassil | Network Engineer, Vanderbilt Data/Video Engineering
voice 615.322.2496 | ICQ 9660375




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