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> If A closes, close B. If B closes, close A.

It's shutdown() writes on EOFs, not close, with refcounting to also do close() when EOFs were detected on both directions (I also have written a TCP proxy). But yeah, TCP proxies are trivial, would be more interesting to see something like a tunneling proxy that sends data over multiple connections to maximize performance.

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Hey, I am looking for a way of packing multiple TCP streams over a single TCP connection to a backend server. I can unpack them in application logic if necessary. Do you know what that is called? Kinda like SCTP

Multiplexing?

The quick and dirty approach would be an ssh tunnel or vpn. There's also GRE tunnels which would be faster, but not encrypted. Any of these would work without having to change the application.

Probably, though, it's best to start with why you would want to do that. You could be, for example, trying to solve something where a pub/sub model would work better. Or just two separate apps, on different ports. What's driving the idea of multiplexing?

Oh that's interesting, can we speak via email:- tom dot larkworthy at Google's popular email provider?

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