All things related to multicast

[Marshall Eubanks <>]

OK, can we find out

- what version people were using
- at least one repeatable case that causes trouble ?

Regards
Marshall

Begin forwarded message:

> From: Rémi Denis-Courmont 
> <>
> Date: June 29, 2008 5:02:10 AM EDT
> To: Marshall Eubanks 
> <>
> Cc: 
>
> Subject: Re: miniSAP
>
> Le samedi 28 juin 2008 20:34:33 Marshall Eubanks, vous avez écrit :
> > We have been having a lot of problems recently with this program
> > blasting out SAP messages (up to 300 Mbps !), which cause multicast
> > problems.
>
> Yeah, so basically... minisap does not implement any bandiwdth  
> measurement at
> the moment. Congestion control is as brain-dead as sending a packet  
> every
> total delay divided by total number of _local_ announces.
>
> > Is there any possibility that this program could be changed to rate
> > limit it to < 1 Mbps or some other reasonable level ?
>
> minisap should measure the incoming SAP traffic, much like the VLC  
> built-in
> SAP sender does. However the official SAP RFC limit (4kbps) sounds  
> very low.
>
> That being noted, the default delay is 5 seconds, so that users wait  
> no more
> than 5 seconds to get the full channels lists. If there are so many  
> announces
> that you currently receive 300 Mbps of them on a single multicast  
> group, it
> would mean there are the order of a million different announces.  
> This seems
> unlikely high. I would suppose there is some buggy sender somewhere  
> that
> sends way too fast, such as an out-of-date version (< 0.3.4) of  
> miniSAP.
>
> --
> Rémi Denis-Courmont
> http://www.remlab.net/