Redundancy support for network address translation (NAT)
DC CAFCFirst Claim
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1. An article of manufacture, comprising:
- a storage medium having instructions stored thereon that are executable by a back-up device to;
share, by said back-up device with a master device, a base address corresponding to a first pool of first addresses that are owned by said master device;
perform network address translation (NAT) and routing, by said back-up device, for a second pool of second addresses while said master device is active;
detect, by said back-up device, a failure of said master device; and
assert ownership, by said back-up device, of all of said first addresses of said first pool corresponding to said base address, in response to detection by said back-up device of said failure.
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Abstract
Stateful failover redundancy support is provided for network address translation (NAT). A master NAT device is backed-up with at least one back-up NAT device. Existing sessions are synchronized between the two NAT devices, such as via a dedicated link between them. In the event of a failover where the master NAT device is unable to perform its NAT functions, ownership of Internet protocol (IP) addresses is transferred from the master NAT device to the back-up NAT device. The back-up NAT device, which is now owner of the IP addresses, assumes the NAT functionality associated with these IP addresses and continues the existing sessions, as well as processing new sessions.
63 Citations
11 Claims
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1. An article of manufacture, comprising:
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a storage medium having instructions stored thereon that are executable by a back-up device to; share, by said back-up device with a master device, a base address corresponding to a first pool of first addresses that are owned by said master device; perform network address translation (NAT) and routing, by said back-up device, for a second pool of second addresses while said master device is active; detect, by said back-up device, a failure of said master device; and assert ownership, by said back-up device, of all of said first addresses of said first pool corresponding to said base address, in response to detection by said back-up device of said failure. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An article of manufacture, comprising:
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a storage medium having instructions stored thereon that are executable by a master device to; share, by said master device with a back-up device that performs routing while said master device is active, a base address corresponding to a first pool of first addresses that are owned by said master device; and perform network address translation (NAT) and routing, by said master device, for said first pool of first addresses, wherein if there is a failure of said master device with respect to any one of said first addresses, ownership of all of said first addresses of said first pool corresponding to said base address belongs to said back-up device. - View Dependent Claims (9, 10, 11)
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Specification