October 2018
Intermediate to advanced
528 pages
12h 33m
English
book
Kali Linux 2018: Assuring Security by Penetration Testing - Fourth Edition
by Shiva V. N. Parasram, Alex Samm, Damian Boodoo, Gerard Johansen, Lee Allen, Tedi Heriyanto, Shakeel Ali
Content preview from Kali Linux 2018: Assuring Security by Penetration Testing - Fourth Edition
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Nmap UDP scan options
While the TCP scan has many types of scans, the UDP scan only has one type, which is the UDP scan (-sU). Even though the UDP scan is less reliable than the TCP scan, as a penetration tester, you should not ignore this scan, because there may be interesting services located on these UDP ports.
The biggest problem with the UDP scan is how to perform the scan quickly. A Linux kernel limits the sending of the ICMP Port Unreachable message to one message per second. Doing a UDP scan of 65,536 ports to a machine will take more than 18 hours to complete.
To help mitigate this problem, there are several methods that can be used, as follows:
- Running the UDP scan in parallel
- Scanning the most popular ports first
- Scanning behind ...
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