I have a new client who has 4 offices. They have a Cisco 1720 router at each office, with point to point T-1 circuits from one office to the nest. We would like to get rid of the T-1 circuits and put cable internet lines into each office, and then configure VPN's from each of the three branch offices back to the main office. Can the Cisco 1720 be configured to work with cable internent service?
Also, what is necessary to to set them up in the VPN configuration?