In this section we will learn about different network problems that occur and try to analyze and solve them with lab exercises. Let's start with the
RST flag resets the connection. It indicates that the receiver should delete the connection. The receiver deletes the connection based on the sequence number and header information. If a connection doesn't exist on the receiver
RST is set, and it can come at any time during the TCP connection lifecycle due to abnormal behavior. Let's take one example: a
RST packet is sent after receiving
SYN/ACK, as shown in the next image.
In this example we will see why
RST has been set after
SYN-ACK instead of