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Beginner

2 L2L tunnels from my ASA, both remote networks are same subnet

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.

Thank you!                  

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Advisor

2 L2L tunnels from my ASA, both remote networks are same subnet

You can NAT the remote end from the ASA. I would assume a Sonicwall can too and it might be easier on that end.

http://www.cisco.com/en/US/products/ps6120/products_configuration_example09186a0080b37d0b.shtml

Beginner

2 L2L tunnels from my ASA, both remote networks are same subnet

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