Is it possible to establish a Site-to-Site VPN between two devices where one of them is behind a firewall? Here is the setup:
<datacenter firewall> - Cisco PIX
<destination facility firewall> - not in my control
<my firewall device> - most likely a juniper SSG or Cisco ASA
Basically, the firewall is in a facility and on a network with either a 10.x.x.x or 192.169.x.x address. Is it possible to establish a site-to-site VPN between my firewall device and the datacenter? I'm reading online about NAT Traversal, but I'm not sure that is what needs to be setup. I'm quite certain that the destination firewall (that is not in my control) is setup to allow VPN tunnels that are established from within.