Detecting unavailable network connections

Details Detecting unavailable network connections Detecting unavailable network connections

2011-03-08

2011-03-08

Moe, Aung S (Department: 2474)

Multiplex communications

Fault recovery

Bypass an inoperative station

C709S223000

Reexamination Certificate

active

07903546

ABSTRACT:
A method for detecting unavailable network connections comprises, at a first data processing node that is hosting a transport protocol connection that uses a plurality of sequence values to identify messages sent to a peer node, wherein the first node is communicatively coupled to a second data processing node serving as a redundant backup, periodically sending a checkpoint sequence value to the second node; detecting that either the transport protocol connection or a process using the transport protocol connection is unavailable, without use of a timeout; and in response thereto, sending a notification to the peer node, wherein the notification includes the checkpoint sequence value. One embodiment provides for rapidly detecting and responding to failure of a TCP process without using long timeouts as conventionally provided in long-lived applications that run on top of TCP.

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