Re: [B.A.T.M.A.N.] Multicast video over 2 node mesh

[Sven Eckelmann <sven.eckelmann@gmx.de>]

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Nathan Wharton wrote:
> I am having problems getting multicast video over my 2 node mesh.  I
> am building under openwrt and the version is 0.3.0-alpha rv1715.

First thing: multicast is currently implemented over broadcast.

> I have a lan bridge on each side.  If I directly add ath0 to the lan
> bridge the video works fine.  But since I want to mesh, I put ath0
> into bat0 instead, and then I put bat0 into the bridge.  This works
> for all my traffic that put across it so far except the multicast
> video.  A tcpdump comparison of both sides shows that after about 32
> packets data starts getting dropped.  The video is about 1Mbs.

Simon changed to broadcast code some time ago. Maybe it is related. Can you 
please try to use ethernet to transfer the data between the nodes (so bat0 
should only have the ethernet device included). Just as test if it could be 
related to midair collisions due to the broadcasts resends or if the broadcast 
code as a general problem.
 
> Given this thousand foot view of the problem, is there something
> obvious I might be missing?  I've set the mtu on ath0 to 1524.
> Everything else seems to work fine, including copying a file over the
> mesh setup that is 20MB at a speed of 578.9KB/s and the md5sum was
> right.

File transfers are unicast. So little problematic to compare with your 
situation.

thanks,
	Sven

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