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?