SECURE AND SEAMLESS ROAMING BETWEEN INTERNAL AND EXTERNAL NETWORKS, SWITCHING BETWEEN DOUBLE AND TRIPLE TUNNEL, AND PROTECTING COMMUNICATION BETWEEN HOME AGENT AND MOBILE NODE

摘要

Systems and methods are described for secure and seamless roaming between internal and external networks. Double and triple tunnels may be used to connect to a mobile node to a correspondent host. A mobile node may include the ability to connect to two networks simultaneously to enable seamless roaming between networks. For instance the system can comprise an internal home agent (602) in a virtual private network, an external home agent (605) and a security gateway (606) between two firewalls (603, 604) in a demilitarized zone, and the tunnels can comprise an internal mobile IP tunnel (610), optionally comprised in an IPsec tunnel (609), comprised in an external mobile IP tunnel (608). In one embodiment the mobile node (607) comprises an application having access to both an external and an internal MIP driver respectively connected to a first and a second network driver. In another embodiment, a communication is transferred from a first to a second network responsive to establishing a second connection with a second network driver.