Network address translation gateway for local area networks...

Details Network address translation gateway for local area networks... Network address translation gateway for local area networks...

2006-06-06

2006-06-06

Vu, Kim (Department: 2135)

Information security

Access control or authentication

Network

C726S011000, C709S217000, C709S218000, C709S238000, C713S150000, C713S151000, C713S153000, C713S160000

Reexamination Certificate

active

07058973

ABSTRACT:
A network address translation gateway (20) provides normal network translation for IP datagrams traveling from a local area network (10) using local IP addresses to an external network (30), but suspends source service address translation when the port is reserved for a specific protocol, such as the ISAKMP “handshaking” protocol that is part of the IPSec protocol model (FIGS.2&3). ISAKMP exchanges require both source and target computers to use the same service address. By providing a network interface that does not translate the source service address, this gateway enables the initiation and maintenance of secure, encrypted transmissions using IPSec protocol between a local area network using local IP addresses and servers on the internet.

REFERENCES:
patent: 6449251 (2002-09-01), Awadallah et al.
patent: 6615357 (2003-09-01), Boden et al.
W. Richard Stevens. TCP/IP Illustrated, vol. 1—The Protocols. 1994. Addison Wesley. vol. 1, pp. 37-38, Section 3.3, 1st paragraph.

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