Interesting ... EPICS is used at boeing... Just curious, what are you working on?
Although I am not an expert on the CA protocol, I believe this is not possible because client-server are connected using the reliable TCP protocol. (UDP broadcast are first used by the client to find the PV on a server, but thereafter it is a TCP one-to-one connection)
That being said, I can see 2 ways to do this which consists mostly in 'hacking' your network.
Those 2 methods are fundamentally the same though: have exactly the same machine (same IP) and duplicate the TCP packets.
1/ You need a computer. Use it as a gateway, i.e. like in a 'man in the middle attack'. That's relatively easy with a dual-interface linux box.
2/ If you have access to a > $1K network switch, log into one of them, use port mirroring. That's a common feature.
Subject: CA question with two identical servers
Date: Fri, 26 Jul 2013 14:32:53 +0000
I would like to use one CA application or MEDM display that will connect to two identical servers running the same PVs. I would like both servers to receive the Channel Access ca_put at the same time. This might mean I have to modify EPICS
code for each server to receive the data simultaneously.
Any ideas on how I would achieve this?