Patent ID: 8356346
Filing Date: 2013-01-15
Classification: H04L

Abstract:
1. A communication process comprising the steps of: a first device connected to a first LAN at a first site and a second device connected to a second LAN at a second site establishing a secure virtual private network session between the sites based on a first VPN security association and a second VPN security association, determining that at least one of the device WAN interface IP addresses has changed; the device whose WAN interface IP address(es) changed transmitting an address change notification message to the other device over a WAN interface whose IP address did not change, the address change notification message indicating which IP address changed and a new value for that IP address; the devices continuing the same secure virtual private network session using the new value for the IP address that changed, with use of the new value for the changed IP address being transparent to VPN applications that are running in the LANs.