ISPs tend to block all inbound traffic. What if I keep the socket alive after the initial handshake with a remote server, and the protocol doesn't impose any limit on how long the socket can be kept open. Can the server send traffic towards me through the socket channel without needing the client to first send a request? I was told that's how push servers work. But I'm confused how this is possible. Isn't the socket just a resource allocated by the two endpoints (client and server)? How is my ISP supposed to know anything about the opened connections to not drop inbound traffic in the middle?
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