Getting into flags
Tuesday, June 2, 2009
U=Urgent Reserved 1|A|P|R|S|F
->If set , checks the urgent pointer field later in the header. That field indicates where you should start reading the data
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A=Ack Reserved U|1|P|R|S|F
->If set , indicates that the sender is acknowledging receiver from the partner
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R=Reset Reserved U|A|P|1|S|F
->If set, sender is refusing or explicitly closing the connection
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understanding these flags helps in understanding our tcp connections which are very much helpful in getting protocols like BGP for example .. can you imagine importance of Reset flag in BGP?