In creating a Partner / Site-to-Site VPN infrastructure with the ability to failover to another technology (i.e. ISDN, wireless, etc.) what is a good design for the head end device, Cisco VPN concentrator or Cisco router?
Keep in mind that partner / site-to-site locations may not use Cisco equipment.
Also note that although the Internet connectivity from the remote site may still be up, the VPN may be down (this is not acceptable as the remote site addresses are RFC1918).
Thank you in advance for your replies.
Omar