Transparent TCP connection failover
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United States of America Patent
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Jul 31, 2007
Grant Date -
Dec 30, 2004
app pub date -
Jun 11, 2003
filing date -
Jun 11, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Methods of transparent connection failover allowing a remote computer (i.e., a client), to continue to use a network connection to communicate with one of at least two or more other computers (i.e., the backup servers) over a network, when one of the other computers (i.e., the primary server) fails. With the mechanisms of this invention, there is no need for the client to establish a new connection to a backup server when the primary server fails. The failover is preferably executed within a bridge layer between the TCP layer and the IP layer of the server's TCP/IP stack. No modifications are required to the network infrastructure, the client's TCP/IP stack, the client application or the server application. The methods support active or semi-active replication of the server application, and do not require rollback of the application during failover. The invention also provides mechanisms for bringing up new backup servers.
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