I am looking to implement a VPN tunnel to remote sites for remote support. Currently I am using the CISCO 837 and gaining access to the remote sites network via an ADSL line implement by ourselves.
What I would like to know is can I acheive the same VPN Tunnel without having to install the ADSL line. I need to be able to create the tunnel using the remote sites already existing leased line..
Is this possible and what type of router would I need.. Also what would be involved in getting this on the remote sites network. and one last point.. would the configuration I am using for the 837 to create the tunnel with head office be the same config I would use for this solution.