Nmap network security scanner man page

ifying their source port. Obviously for a UDP scan. you should try 53 first and TCP scans should try 20. before 53. Note that this is only a request --nmap will honor it only if and when it is able to. For example, you can't do TCP ISN sampling all from. one host:port to one host:port, so nmap changes the. source port even if you used -g. ................
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