Multicast Problem (Please Help, very important for me)

[Student]

I m trying to multicast a stream from my Computer but this doesen´t work:
My Computer has the IP Address 134.168.30.164 (Win XP)
The Computer of a Colleague has the IP Address 145.168.30.178(Win 2K)
We are both on the same LAN

I typed this line in my computer in order to multicast a stream:

vlc -vvv video.mp4 --sout udp:239.255.12.42 --ttl 12

and I typed this line in the computer of my colleague:

vlc -vvv udp:@239.255.12.42

but I can´t receive anything on the computer of my colleague

I have also tried to prcise the UDP Port and typed:

vlc -vvv video.mp4 --sout udp:239.255.12.42:5000 --ttl 12
and
vlc -vvv udp:@239.255.12.42:5000

but this doesn´t work too.

the Unicast Communication between the two Computers works very well. so when i Type:

vlc -vvv video.mp4 --sout udp:134.168.30.178 --ttl 12 in my computer

and

vlc -vvv udp: in the computer of my Colleague, i can receive the stream in the computer of my Colleague.

Can anyone please Help me.

[markfm]

It looks like the proper command line to use. (I tried it on my own computer).

Is there any chance that the server computer has two different Ethernet cards installed? If it does, you have to use the VLC interface option in order to tell VLC which NIC to push the multicast stream out of.

If you are on a corporate or campus LAN, it is quite possible that the LAN switches have been programmed to block multicast. For instance, I know that is the case at my company.

The "--ttl 12" part is something you would normally use for a routed environment. The Time To Live basically tells the routers along the path if they should pass the data packets along (each router that it has to go through decreases the TTL in the packet that is forwarded by it). If you are going though routers, they definitely need to be programmed to permit multicast if you want to use it (I just went through this exercise with a pair of Cisco 1760s).

[karlito]

maybe I am wrong, but how come you are on the same LAN and dont have the same network number in your IP addresses ?

My Computer has the IP Address 134.168.30.164 (Win XP)
The Computer of a Colleague has the IP Address 145.168.30.178(Win 2K)

http://www.cisco.com/univercd/cc/td/doc ... .htm#28394[/b]

[Student]

Sorry, that was atyping error (134 instead of 145)

[karlito]

are you sure the LAN you are in is Multicast able ?
multicast routers need certain features as beeing able to copy the streamed data, managing the multicast session and protocols (IGMP..)

ask your system administrator if the LAN is multicast able.