Appeal No. 2006-0252 2
Application No. 09/755,564
Representative claim 1 is reproduced as follows:
1. A method for defeating, in a server unit of an Internet
Protocol network, a SYN flooding attack, said server unit running
Transmission Control Protocol to allow the establishment of one
or more transmission control protocol connections with one or
more client units, said method comprising the steps of:
upon having activated the transmission control protocol in
said server unit,
listening for the receipt of a SYN message sent from a
client unit;
upon receiving said SYN message,
computing an Initial Sequence number Receiver side, wherein
said Initial Sequence number Receiver side is embedded with
connection parameters specified in the SYN message;
responding to said client unit with a SYN-ACK message
including said Initial Sequence number Receiver side;
resuming to said listening step; and
responsive to receiving an ACK message, determining whether
to establish a transmission control block for the client unit by
evaluating an incremented value of the Initial Sequence number
Receiver side included in the ACK message.
The examiner relies on the following reference:
Denker 5,958,053 Sep. 28, 1999
Claims 1-5 and 7-14 stand rejected under 35 U.S.C. § 102(e)
as being anticipated by the disclosure of Denker.
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