February 2018
Intermediate to advanced
396 pages
9h 38m
English
Content preview from Advanced Infrastructure Penetration Testing
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UDP Scanning
User Datagram Protocol (UDP) is an internet protocol suite. It is an alternative to TCP, but it is unreliable. It just sends the packets without waiting for an acknowledgment. The UDP header has four 2-byte fields:
- Source port
- Destination port
- UDP length
- UDP checksum
During UDP scanning, a UDP packet is sent to a UDP port of a host. If there is no response, then the port is open or else it will receive a "Destination unreachable" error.
Nmap is the most famous open source network discovery and mapping tool. It is a very flexible, powerful, and well-documented utility. You can download it from: https://nmap.org/download.html.
The following screenshot shows the main interface of the graphical user interface mode of Nmap called ...
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