Method for synchronizing network address translator (NAT) tables using the open shortest path first opaque link state advertisement option protocol
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United States of America Patent
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Jul 9, 2002
Issued Date -
N/A
app pub date -
Jun 29, 1998
filing date -
Jun 29, 1998
priority date (Note) -
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Abstract
A method for distributing Network Address Translator (NAT) translation table information among border routers associated with a routing domain using the Open Shortest Path First (OSPF) Opaque Link State Advertisement (LSA) option protocol. The NAT translation table information is included in an application specific field following the LSA header. LS type 9 LSA packets are used to limit the flooding scope to the local network segments attached to the border router. Network address information, i.e., local network address and corresponding global network address, are transmitted in the application specific field of the Opaque LSA packet. The Opaque LSA packets are exchanged between a group of interconnected Opaque LSA capable border routers so that the border routers can maintain identical NAT translation tables as necessary to forward data packets according to the NAT forwarding paradigm.
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