Have a delima here….
We are currently using a Linksys BEFVP41 router and its VPN capabilites to connect to a router running IPCop. This works fine.
We recently started using another piece of software. This software makes and uses a LT2P VPN connection back to the vendor using the Windows VPN client. For this to work I had to of course turn on IPSec passthrough on the Linksys. However the Linksys has major issues with this. Turning on Passthrough makes the router's own VPN stop working correctly.
I thought I would just replace the Linksys with another IPCop, but come to find out IPCop no longer supports VPN Pass-through! So I have turned to pfSense.
Would pFsense support this type of setup without problems? To recap: Pfsense IPSec to IPCop IPSec, with a LT2P VPN client connecting to a different server BEHIND the Pfsense. VPN Passthrough enabled of course.
Guess this is untested. However I have no issues running ipsectunnels at the pfsense itself and using ipsec clients at lan to go somewhere else so far. Give it a try and let us know.