[KLUG Members] Packet routeing

[Tony Gettig]

Quoting John Pesce <pescej@sprl.db.erau.edu>:

> 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 are the sites connected? VPN? Leased line?

> 
> 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.

Is there any way to put all those devices that need to speak to each other in 
their own vlan? Might that permit what you're trying to do? I don't know 
specifically how to do this, but for instance, it is common to put 
infrastructure like switches in their own "management" vlan. Where I work, we 
put different types of users and devices in different vlans based on many 
factors. But all of our buildings are in the same city and connected via fiber.

> 
> 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


-- 
Tony Gettig
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