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Comments on Data transfer between computer system ports, as unidirectional or bidirectional

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Data transfer between computer system ports, as unidirectional or bidirectional

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I understand that with computer systems (non virtual or virtual), data between the network of two or more computer systems can come in via a port and can come out via a port.

Is it common to filter computer ports to work unidirectionally instead bidirectionally? I mean, is it common to set firewall rules for ports to transfer data in only one direction (only inwards with incoming data or only outwards with outgoing data)?

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General comments (2 comments)
General comments
Alexei‭ wrote almost 3 years ago

I think there is a misunderstanding here. The direction applies to connections, not data. Connections are typically allowed in one direction only (e.g. your computer is allowed to connect to lots of Internet hosts on port 80.443, but the reverse is not true). However, once the connection is established (and even before, to set up the connection) the data flows both ways.

deleted user wrote almost 3 years ago · edited almost 3 years ago

Thank you a lot Alexei. I think that especially now after I have edited the post a bit, this should actually be an answer because you just "hit the spot" 100% about what I meant to understand.

Skipping 1 deleted comment.