I need to setup a site to site vpn on two pix 515 that will be running version 7x software. The problem is these two pix came with the default hardware e.g. one outside and one inside interface and both need to connect to two routers, isp and private. I heard that it can be done using a sub interface and configuring ospf. Is this possible and is there any documentation or template on how to do this?
Any help will be greatly appreciated.