Pix VPN Client and Nat-T

[s.nicholls]

I have a Pix running 6.3 software.When I enable

Nat-T I have seen strange behaviour with the VPN client.When it connects from behind an ADSL Router/Firewall that supports VPN passthrough the connection doesn't always work.You have to untick enable transparent tunneling.But the next time it will work without this problem.Also some applications appeat to work better than others.

Any ideas?

[mostiguy]

Some SOHO routers have ipsec passthrough features that can interfere with isakmp and ipsec negotiation. I prefer disabling those features, and relying on using nat traversal on the software client - it has always worked flawlessly for us