The VideoLAN Forums

Hi,
I have been using vlc for streaming for few months now. What i used to do is encode from tuner card using nvrec and stream the file using vlc.
The problem i have noticed is that the multicast stream is sent to everyone on the lan. Which clearly should not be happening: The mrl is 239.255.12.42:4444 . A typical line when lan is sniffed by ethereal is:

0.439514 10.4.11.5 -> 239.255.12.42 UDP Source port: 32922 Destination port: krb524
0.469370 10.4.11.5 -> 239.255.12.42 UDP Source port: 32922 Destination port: krb524

There is no client listening to multicast where the scan is done.
Kindly help

Sudhanshu

that means that your switch either doesn't support igmp, or isn't set properly...

that means that your switch either doesn't support igmp, or isn't set properly...

I suspected that...btw we use Lucent/Avaya (level 2) switch, proper configuration should be possible.

Thanks a lot !
Sudhanshu

that means that your switch either doesn't support igmp, or isn't set properly...

I suspected that...btw we use Lucent/Avaya (level 2) switch, proper configuration should be possible.

Thanks a lot !
Sudhanshu

I've done a lot of multicast streaming (not with VLC however). You NEED your switches to understand enough of layer 3 to filter the multicasts, otherwise it is treated as a broadcast and flooded to all ports.

Our LAN is nearly 100% cisco, so we use Cisco's 'CGMP' to make sure the switches multicast filter. Pretty well all cisco's switches support CGMP, not all their product supports 'igmp snooping'.

i have the same problem. i have a switch allied telesyn and vlc from windows pc send igm packets, but from linux it does not.
the switch can handle igmp that shows the windows version from vlc, but whats the matter with the linux version?