I have a customer that for various reasons has a Cisco router sitting behind a NATed ADSL connection. They want to create a VPN to one of our points of presence and the only options we offer are site to site or L2TP dial in.
Is it possible to configure their Cisco (3925) to connect via L2TP to our PoP? The L2TP server is a pair of Fortigate 100Ds and the configuration allows iPads, laptops, etc to dial in no problem, protected by IPSEC.
I'm testing this in my office with a 1921, the few references I've found indicate using a pseudowire setup is necessary, but I'm having trouble with getting that up, and where IPSEC fits into it.