Expand description
The TCP flags.
Constants§
- ACK
- ACK – indicates that the Acknowledgment field is significant. All packets after the initial SYN packet sent by the client should have this flag set.
- CWR
- 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 and had responded in congestion control mechanism (added to header by RFC 3168).
- ECE
- ECE – ECN-Echo has a dual role, depending on the value of the SYN flag. It indicates: If the SYN flag is set (1), that the TCP peer is ECN capable. If the SYN flag is clear (0), that a packet with Congestion Experienced flag set (ECN=11) in IP header received during normal transmission (added to header by RFC 3168).
- FIN
- FIN – No more data from sender.
- NS
- NS – ECN-nonce concealment protection (experimental: see RFC 3540).
- PSH
- PSH – Push function. Asks to push the buffered data to the receiving application.
- RST
- RST – Reset the connection.
- SYN
- SYN – Synchronize sequence numbers. Only the first packet sent from each end should have this flag set.
- URG
- URG – indicates that the Urgent pointer field is significant.