I have a windows 2003 NLB with 2 servers that is trying to multicast and it cant multicast out of its local vlan/subnet. I am running VLC server to UDP multicast an MP3 file across the network as a test. Only people on the same vlan can hear the audio stream.
Our first thought was that it was a multicast routing problem in the network(I am the net admin) but we validated the network setup with Cisco and if we multicast the MP3 file from any other machine other then the cluster it can be heard on any VLAN across the network. Multicast Routing is working.
So we think its an issue with the NLB. Perhaps there is a TTL setting that is stuck at 1?
Any help is greatly appreciated.