[KLUG Members] Packet routeing

[John Pesce]

Ok. Here is a weird request I got from the higher ups regarding another 
project.  One project is using UDP multicast to pass around data from 
several programs on several machines on a local net using a multicast 
group.  This program apparently needs to no which computer sent the data, 
so it looks at the source address of the UDP packet.

Now they would like to do the same thing, but with programs located on two 
subnets which are in different states.

How can I bridge the gap? My only experience with multicast is to get 
programs chatting on a local subnet. I think the requirement to keep the 
source address of the packet might cause problems.

This is a many server to many client situation, like a peer-to-peer 
multicast group.

is this as simple as turning on PIM-DM on the routers on both subnets and 
in between?

Help please,
John