Setting up VPN using 1861 behind an Actiontec Router

[abknoc]

I need to setup a vpn between our main office and a remote user using his verizon fios internet connection. His uses this service both for data and TV. Verizon provided him an actiontech MI-424-WR router.

* Can I setup ipsec vpn or just gre tunnel behind the actiontec router using a Cisco a 1861 router?

* Will there be any configuration changes done on the actiontec router?

* any caveat?

[ivillegas]

Most of the time issue happens to be with incompatible parameters on either side. I have faced an issue due to incompatible default IPsec and Iskamp lifetimes on the routers. Mathching them seemed to have fixed the issue.