TCP Reset frame



A TCP reset basically kills a TCP connection instantly.

headers contains a bit known as the "reset" (RST) flag.

it indicates to the receiving computer that the computer should immediately stop using the TCP connection;

it should not send any more packets using the connection's identifying numbers, called ports, and discard any further packets it receives with headers indicating they belong to that connection.



A 'router' could be doing anything - particularly NAT

One reason a device will send a RST is in response to receiving a packet for a closed socket.


an application makes lots of short-lived TCP connections and we don't want to leave the connection on the server in a Time Wait state

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