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1

The remote PC needs a default gateway in order to access anything beyond it's local network or for anything beyond it's local network to access it. There's no way for you to remotely connect to the remote PC in order to set it's Default Gateway without it having a Default Gateway set, so you're in a bit of a catch-22. If you can access another computer on ...


2

A SYN received on an ESTABLISHED TCP connection should not be happening. It could be a delayed packet, which it would be safe to silently drop. It is possible to end up with the server in ESTABLISHED state and client in CLOSED state if the connection is lost and is timed out on the client and not on the server, or if the client is restarted. Attempting to ...


0

Neither...SYN is only used when the connection is first set up (the three-way handshake) or when the packet is destroyed. Basically: SYN (I want to start a connection) -> ACK/SYN (OK, I want to start a connection too) -> ACK (acknowledged connection, ready for data) Conversation flows with ACK packets sent by both hosts indicated they recieved each ...


1

The IP addresses to use for the TCP connection are chosen by the client when the connection is established. The choice can be made either by the application layer by binding the socket to a specific IP before connecting, or by the kernel if the application layer did not make a choice. The choice made by the kernel can be controlled in a few different ways. ...


0

The previous answers will tell you, that TCP connections cannot be kept alive when the IP address changes. That was correct in 2009, when those answers were written. However in January 2013 RFC 6824 was published, which introduces a way to keep TCP connections alive when the IP address changes. As of June 2014, it is not yet widely supported. Most notably ...


5

They disconnect. TCP has no protocol part for changing the IP address so the clients will not know that it has changed magically. A new connection will have to be established.



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