VPN tunnel redirection

Details VPN tunnel redirection VPN tunnel redirection

1999-06-30

2004-03-09

Nguyen, Chau (Department: 2663)

Multiplex communications

Data flow congestion prevention or control

Flow control of data transmission through a network

C370S401000

Reexamination Certificate

active

06704282

ABSTRACT:

FIELD OF INVENTION
Invention relates to electronic networking, and particularly to techniques for tunnel redirection in Virtual Private Networks (VPN).
BACKGROUND OF INVENTION
Conventional digital networks use VPNs to achieve improved performance between network nodes. In large-scale VPN environments, tunneling devices may handle large number of tunnels and sessions. Hence, network scalability may be achieved through load sharing, e.g., wherein multiple tunnel terminators cooperate to balance load among themselves.
Prior load-sharing mechanism is implemented in tunnel initiators. In particular, such mechanisms are often statically configured or perform look-ups through preconfigured database for tunnel terminator according to incoming user information. Thus, when tunnel terminator is overloaded or unreliable and cannot handle more sessions, then such mechanisms have no way to accept and process incoming call. Accordingly, known mechanisms use tunnel initiators which generally do not properly manage resources or load-sharing and reliability of tunnel terminators, and, furthermore, cannot easily scale for multiple corporate sites. Thus, there is a need for solution to improve scalability and stackability of VPN servers.
SUMMARY OF INVENTION
Invention resides in VPN tunnel redirection scheme, wherein tunnel initiator is redirected to another tunnel terminator according to traffic load, resource availability, and system reliability in VPN environment.
Preferably, pointed terminator redirects call by sending special call clear message to tunnel initiator with IP address of recommended terminator in pool during PPP authentication. Initiator terminates current session with pointed terminator, establishes tunnel and/or session with recommended terminator, and starts session again without terminating incoming call.


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patent: 6341127 (2002-01-01), Katsube et al.
patent: 6415027 (2002-07-01), Malik

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