ISR Computing -
How to decode TCP Connection flags
How to decode TCP Flags?
It is quite simple:
FRPA = FIN, RST, PSH, ACK
A = ACK
PA = PSH, ACK
FPA = FIN, PSH, ACK
SPA = SYN, PSH, ACK
RPA = RST, PSH, ACK
Use the following as your guide:
CWR – Congestion Window Reduced (CWR) flag is set by the sending host to indicate that it received a TCP segment with the ECE flag set.
ECE (ECN-Echo) - indicate that the TCP peer is ECN capable during 3-way handshake
URG – indicates that the URGent pointer field is significant
ACK – indicates that the ACKnowledgment field is significant
PSH – Push function
RST – Reset the connection
SYN – Synchronize sequence numbers
FIN – No more data from sender
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