All things related to multicast

[Zenon Mousmoulas <>]

On 23 Ιουν 2008, at 3:43 ΜΜ, Michael Fortier wrote:

> [...]
>
> Hi,
> Here is the message I posted Friday... but everybody didn't receive  
> it.

> I tested the miniSapserver 0.3.4 found here :
> http://download.videolan.org/pub/videolan/miniSAPserver/
> This version has some bugs.
> DO NOT USE IT
> Problem was in the announcement interval.
>
> I corrected and now the intervalley of dispatch is 30 seconds (fixed).
> You can find sources here : 
> http://exp-videos.univ-paris13.fr/src/minisapserver-0.3.4b.tar.gz
>
> I'm under Linux. Commands to install :
> #./configure (--prefix=...)
> # make && make install
> # ./minisapserver -d -c sap.cfg
>
> sap.cfg exemple with 2 announces :
> [global]
> sap_delay=55
> sap_ttl=255
> [program]
> name=Video SD 352x264 - 35 ans P13 - IPv4
> user=videolan
> machine=exp-videos.univ-paris13.fr
> site=http://exp-videos.univ-paris13.fr
> address=224.5.43.1
> port=1234
> playlist_group=University Paris 13
> program_ttl=255
> [program]
> name=Video SD 352x264 - 35 ans P13 - IPv6
> user=videolan
> machine=exp-videos.univ-paris13.fr
> site=http://exp-videos.univ-paris13.fr
> address=ff0e::2:beeb
> port=1234
> playlist_group=University Paris 13
> program_ttl=255
>
> I created a blog which lists all information
> I shall give you the url as soon as it will be made
> Regards
>
> Michael Fortier

Bonjour Michél,

I looked at what you did (hardcoding sap_delay to 30 seconds).

I tested the unmodified 0.3.4 with the configuration you provide and I  
confirmed with VLC and a packet trace that it works flawlessly: it  
adheres to the configured interval (30s) and sends valid SAP messages.
The only problems I could spot are that it doesn't set the originating  
source field correctly in the SAP header (not so uncommon) and that it  
doesn't announce IPv6 sessions to the appropriate IPv6 SAP group (it  
can't because it doesn't differentiate them from IPv4).

But, guess what, no SAP storm!

Is this the configuration you were using when the sap storm took  
place? I think some piece of the puzzle is missing here.

Z.