Networking Reference
In-Depth Information
TCP header
The following diagram shows the header format of TCP:
TCP header
The source port number and destination port number set the port numbers.
The sequence number starts at the fourth byte in the message transmitted from
the source node to the destination node, as shown in the figure demonstrating
the three-way handshake protocol. The acknowledgement number is the next
sequence number that the source node expects.
TCP lags
The following is the list of lags that are commonly used in ZeroMQ:
URG (0x20) : Urgent
ACK (0x10) : Acknowledgement
PSH (0x08) : Push
RST (0x04) : Reset
SYN (0x02) : Synchronize
FIN (0x01) : Finish
 
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