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How could simulating the ports as open be useful? (sopuli.xyz)

submitted 2 months ago* (last edited 2 months ago) by sapporo@sopuli.xyz to c/programming@programming.dev

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I've read an article which describes how to simulate the close ports as open in Linux by eBPF. That is, an outside port scanner, malicious actor, will get tricked to observe that some ports, or all of them, are open, whereas in reality they'll be closed.

How could this be useful for the owner of a server? Wouldn't it be better to pretend otherwise: open port -> closed?

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[–] sapporo@sopuli.xyz 1 points 2 months ago* (last edited 2 months ago) (1 children)

You can’t pretend-close it and still have that service work.

indeed, a service on a port would no longer properly work. However, pretending that an open port is closed is possible the same way when pretending that's open

[–] dnick@sh.itjust.works 1 points 2 months ago

Maybe what you're referring to is along the lines of a port being open but the software on the other side of it not sending acknowledging responses?