All things related to multicast

[Prashant Jhingran <>]

Hi,

It’s very difficult to pin point the problem with such limited
information. However following is my prediction.

The receiver should initially send IGMP or MLD unsolicited joins (for
IPv4 and IPv6 respectively) for receiving a mcast streams. The receiver
should also send IGMP/MLD join messages on receiving periodic IGMP/MLD
queries (in response) from the router in order to continuously receive
the mcast streams. If it doesn't then the receiver will encounter the
problem which you are experiencing.

However for receiving from local source (lying on the same LAN), the
receiver needn’t send IGMP joins (in response to queries, in fact no
need of a router itself). Thus for local source, lying on the same LAN
there would never be a problem.

Therefore I feel that the application which you are using for receiving
the stream is not responding to the IGMP/MLD queries sent periodically
by the router and hence the router is deleting the multicast tree thus
freezing the streams once IGMP/MLD entries expire. Some mcast apps send
periodic IGMP/MLD unsolicited reports thus serving the purpose of
periodic refresh of IGMP/MLD entries.

BTW Which mcast app are you using for receiving mcast stream? Try "VLC"
free ware it works fine.

-Regards,
Prashant Jhingran

Huawei Technologies
Shenzhen, P R China
Off#+86-755-28976431
Mobile#+86-13480651542
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-----Original Message-----
From: Ramon Sierra 
[mailto:]
 
Sent: Wednesday, July 19, 2006 10:33 PM
To: 

Subject: Help


Hi,

I need help with the following problem.  All multicast streams I am 
receiving get freeze after 4 mins or so.  If I'm the source or any of my

campuses is the source there is no problem.  Anyone is having the same 
problem?  Anyone has any clue about what could be the problem?

Any suggestion will be appreciate it,

Ramón