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What is the advantage of using the source port scan to evade a firewall?
You can determine the source port
You can determine ports
You can pass badly configured firewall
You can determine packet size
A common error that many administrators make when configuring firewalls is to set up a rule to allow all incoming traffic that comes from a specific port number. The '–source-port' option of Nmap can be used to exploit this misconfiguration. Common ports that you can use for this type of scan are: 20, 53 and 67. https://pentestlab.wordpress.com/2012/04/02/nmap-techniques-for-avoiding-firewalls/
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