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Null Probe is an effort to contribute to Information Security and to maintain a give & take relation with technology & knowledge. Lately, I realized that instead of waiting for the right time to pay back, why not take a foot forward and initiate right away. I started this ‘blog‘ so as I can enjoy my freedom of expression (any random topic – tech or non tech) via text, figures, and quotes using Internet and some Technological adventures. And, till date, I am too young to revolutionize anything, but keep visiting, I may edit this line some fine day. Right now, I can contribute to evolution of every aspect of biting the byte!
NULL PROBE (Geek Trivia)
Once the TCP connection is made, Nmap listens for roughly five seconds. Many common services, including most FTP, SSH, SMTP, Telnet, POP3, and IMAP servers, identify themselves in an initial welcome banner. Nmap refers to this as the NULL PROBE, because Nmap just listens for responses without sending any probe data. If any data is received, Nmap compares it to hundreds of signature regular expressions in its nmap-service-probes file.