In other words, I'm trying to create L2L tunnels to two separate clients. Each client has a Sonicwall, presumably with a pretty basic config, since both networks are 192.168.168.0/24.
How can I create a lan to lan tunnel to both of these customers?
They are small clients, and i do have access to their firewalls, so one option is to change the local subnet on one of those to another scheme.
But I would REALLY like to know if there's something i can do on my 5540 to allow this config.
You can NAT the remote end from the ASA. I would assume a Sonicwall can too and it might be easier on that end.
If the remote sites are quite small (less than 120 connections) you could subnet - 255.255.255.128.
set one site up as 192.168.168.1-126 the other 192.168.168.129- 254