multicast network in vpn

[Frodor]

Anyone has similar experience?
I need to setup a multicast enable network to have multi-party
conferencing using netmeeting and including all my remote locations.

Currently, my HQ and other remote locations are using class C
network. If i change all the class C to multicast range IP but how to
do it in VPN ?? because internet cant route multicast and also
my older router cant support multicast routing.

Any advice is greatly appreaciated.


Thanks.

 

[Dusty Harper {MS}]

You wouldn't change any of the addresses. The multicast addresses exist
aside from your logical Class C address.

What essentially happens is that your IP joins a multicast group. a quick
example:

A router running RIPv2. its interface is 192.168.0.1

It joins the Multicast group 224.0.0.5. This means that the interface is
listening for messages from 224.0.0.5 as well as its Class C address.

What you will need is a forwarding component for the multicast stream.
Microsoft's Routing and Remote Access allows for Multicast Forwarding and
also has IGMP which creates the Multicast Forwarding Entries