Load balancing in a network with session information
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United States of America Patent
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Sep 27, 2016
Issued Date -
N/A
app pub date -
Feb 28, 2016
filing date -
Feb 16, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
Methods and systems for balancing load among firewall security devices (FSDs) are provided. According to one embodiment, session data, including session entries representing previously observed traffic sessions from a particular source to a particular destination and forming an association between the previously observed session and a particular FSD, is maintained by a switching device. When a TCP SYN packet is received, the switching device: (i) reduces its vulnerability to a TCP SYN flooding attack by foregoing installation of a forward session entry for the forward traffic session within the session data until a processed TCP SYN-ACK packet associated with the corresponding reverse traffic session is received; (ii) selects an FSD to associate with the forward traffic session and a corresponding reverse traffic session by performing a load balancing function on the TCP SYN packet; and (iii) causes the TCP SYN packet to be processed by the selected FSD.
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