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Editorial Team
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Asked: 2026-05-26T23:16:48+00:00

This is just a general question. In TCP/IP when you set up a connection

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This is just a general question.

In TCP/IP when you set up a connection between two points you do a 3 way hand shake.

Do you have to re do this every time you change the source port and/or destination port?

I.e lets say you set up a connection from ip A to ip B and source port s to source port d. Now you want to send a packet from source port s to a new source port e. Do you have to establish another connection here again?

Or do you only establish the connection when you first encounter the ip addresses?

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1 Answer

  1. Editorial Team

    A connection in TCP is identified by the 4-tuple (source-ip, source-port, destination-ip, destination-port). Therefore, connecting to a different port on the same machine requires you to establish a new TCP connection.

    Consider that it is possible, through NAT and other routing tricks, for requests to different ports on the same IP address to go to different machines anyway.

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