May 2018
Intermediate to advanced
326 pages
8h 32m
English
Content preview from Practical Network Scanning
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The FIN probe
A FIN packet is used to close the TCP connection between client and server. Closing the connection is more complex than creating a connection because both sides have to release its resources. In the following diagram, you can see that a FIN packet works with the last ACK:
Tools like Nmap can generate a FIN packet without having the ACK set to 1. An operating system might respond to this with RST, which gives you a clue about the remote operating system.
When designing their TCP/IP implementations, vendors have had different interpretations of RFC 793, Transmission Control Protocol. When a TCP segment arrives with the FIN flag ...
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