VPN Client Interop - is there any such beast?

[SunnyD]

Basically I'm looking to find this out -

We use 3 different VPN clients to various client sites. MS, Cisco and Checkpoint. Do any of these clients interop with each other? I'm looking to eliminate unnecessary application software overhead if possible, and of course, client sites aren't going to just up and change over their VPN infrastructure.

Any help would be appreciated.

 

[atmguru]

It's the server side that matters. Your server needs to be compatable with the various clients. Chances are, probablly not.