May 2017
Intermediate to advanced
634 pages
16h 24m
English
Content preview from Kali Linux Network Scanning Cookbook - Second Edition
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How it works...
To effectively use hping3 for layer 3 discovery, a bash script was used to perform an ICMP echo request in sequence. This was possible due to the unique response that was generated by a successful and unsuccessful request. By passing the function through a loop and then grepping for the unique response, we could effectively develop a script that performs ICMP discovery against multiple systems in sequence and then outputs a list of live hosts.
For layer 4 discovery, hping3 uses ICMP host-unreachable responses to identify live hosts with UDP requests and uses null-flag scanning to identify live hosts with TCP requests. For UDP discovery, a series of null UDP requests is sent to arbitrary destination ports in an attempt to solicit ...
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