May 2017
Intermediate to advanced
416 pages
21h 33m
English
Content preview from Nmap: Network Exploration and Security Auditing Cookbook - Second Edition
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The IP ID sequence number
The ID field in the IP header is mostly used to track packets for reassembling, but because a lot of systems implement this number in different ways, it has been used by security enthusiasts to fingerprint, analyze, and gather information from these systems.
Home routers, printers, IP webcams, and primitives often use incremental IP ID sequence numbers and are great candidates to be used as zombie hosts. They also tend to sit idle most of the time, which is an important requirement for idle scanning. To find out if a host has an incremental IP ID sequence, there are two options:
- Using verbose mode with OS detection, as follows:
#nmap -sV -v -O <target>
- Using Kriss Katterjon's NSE script ipidseq as follows:
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