All things related to multicast

["Lucy E. Lynch" <>]

Bill -

Additional testing on our end (thanks to Jon Miyake) shows that
any large announcement will break both SDR & XMIM (info field,
subject field etc.) and it appears that this is related to
the strong suggestion in the RFC:

RFC 2974             Session Announcement Protocol          October 2000

   RECOMMENDED that SAP packets are smaller than 1kByte in length,
   although if it is known that announcements will use a network with a
   smaller MTU than this, then that SHOULD be used as the maximum
   recommended packet size

Not sure if IP/TV & VBrick have the same limitations built in.

Lucy E. Lynch                           Academic User Services
Computing Center                        University of Oregon

                (541) 346-1774/Cell: 912-7998

On Mon, 13 May 2002, Bill Owens wrote:

> At 11:07 -0700 5/10/02, Lucy E. Lynch wrote:
> >James -
> >
> >I'm using both SDR v2.8 and xmim (see:http://videolab.uoregon.edu/mim/)
> >to try and gather sap announcements on a linux box (redhat 7.1) -
> >XMIM will collect announcements for a while and then seg faults -
> >while sdr manages to collect announcements and stay up - but if I
> >exit and then re-start it dumps core.
>
> I have seen the same symptoms here, with SDR 2.8. I am also running
> the sdr-monitor TCL script, I'm not sure if that makes any difference.
>
> BTW, the University at Buffalo did not have multicast connectivity
> until very recently, April 25 to be exact. Prior to that date Jim was
> presumably running this session unicast, or with a point-to-point
> tunnel that didn't touch the MBONE.
>
> Bill.
>