Network address translation with gateway load distribution

Details Network address translation with gateway load distribution Network address translation with gateway load distribution

2003-03-28

2010-10-12

Abdullahi, Salad (Department: 2457)

Electrical computers and digital processing systems: multicomput

Multiple network interconnecting

C709S226000

Reexamination Certificate

active

07814232

ABSTRACT:
Gateway and NAT services to a single host or large number of hosts on a local network using a redundancy group having gateway devices. A pool of unique IP addresses are partitioned into address blocks, one of which is assigned to a gateway device. Using the unique IP addresses in its assigned address block, the gateway device translates local IP addresses of hosts on a local network to unique IP addresses from the gateway device's assigned address block for host packets destined for outside networks and creates a mapping of the translation. The gateway device notifies other gateway devices in the redundancy group of the mapping. A master mapping database or a local mapping database is updated whenever one of the gateway devices performs a translation. In the event that one of the gateway devices ceases forwarding of outgoing packets for a host using the gateway device's virtual MAC address, that virtual MAC address is re-assigned to an operating gateway device in the redundancy group to permit continued forwarding of the host's packets destined for outside networks.

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