December 2015
Beginner to intermediate
172 pages
3h 2m
English
Content preview from Packet Analysis with WiresharkBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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TCP troubleshooting
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 Reset (RST) packet.
TCP reset sequence
The TCP 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.
RST after SYN-ACK
In this example we will see why RST has been set after SYN-ACK instead of ACK:
Open the RST-01.pcap ...
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