I am looking to setup a VPN between one location in California (main site) and one site in Belgium, one site in Korea and one site in China. If all sites have static IP addresses and I send the necessary VPN hardware to each location, what other costs are involved once the hardware is setup and running? The remote sites will not require much bandwidth as only one user at a time will likely access files locally here in california.
Also how reliable would this type of international connection be using off the shelf sonicwall or netgear type appliances?
Any experienced information is appreciated.