I work in Disaster recovery area where we have many customers and sometimes they need to connect back to their base which is on the same subnet or to one of our sites for workarea. I need to have a way of communication between different sites no more than 2 at a time. each site has its own public ip address and no MPLS network. So they epect me to have a setup where they pretty much expect a bridge over the internet which i know is possible with some means of DOT1Q tunnelling but have no idea howor where to start. I have access to ASA 5520 or PIX 515 or cisco 3640 router. so any solution can be implemented by me. You help is very much appreciated.