Security Basics mailing list archives
RE: nmap status question
From: "Brad Bemis" <Brad.Bemis () airborne com>
Date: Tue, 29 Jul 2003 08:56:10 -0700
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A port is in either of the two states ie , open or closed at any point of time. >
That is not exactly correct. Ports are not either open or closed. Depending on the protocol, there are actually several different states of activity. For instance, in TCP - state is managed as an element of the Transmission Control Block (TCB). The various TCP states are: LISTEN, SYN-SENT, SYN-RECEIVED, ESTABLISHED, FIN-WAIT-1, FIN-WAIT-2, CLOSE-WAIT, CLOSING, LAST-ACK, TIME-WAIT, and the fictional state CLOSED. CLOSED is fictional because it represents the state when there is no TCB, and therefore, no connection. Thank you for your time and attention, ======================== Brad Bemis Information Security Services Airborne Express (206) 830-3478 ======================== Email Notice: This communication may contain sensitive information. If you are not the intended recipient, or believe that you have received this communication in error; do not print, copy, retransmit, disseminate, or otherwise use the information contained herein for any purpose. Please alert the sender that you have received this message in error, and delete the copy that you received. -----BEGIN PGP SIGNATURE----- iQA/AwUBPyaZGpDnOfS48mrdEQJiWgCaAk28bAb21CBQ7SiQT9lJ+ZcjBOQAoJ89 DG/70ZiEnqFJ8pI0D6v4yslW =E5DZ -----END PGP SIGNATURE----- --------------------------------------------------------------------------- ----------------------------------------------------------------------------
Current thread:
- nmap status question marc brown (Jul 28)
- RE: nmap status question Thomas Ng (Jul 29)
- Re: nmap status question Joshua J . Kugler (Jul 29)
- Re: nmap status question David (Jul 29)
- Re: nmap status question gminick (Jul 29)
- Re: nmap status question Pete Hunt (Jul 29)
- Re: nmap status question Birl (Jul 29)
- Re: nmap status question Terry A. Durrant (Jul 29)
- Re: nmap status question Shaun Moore (Jul 29)
- <Possible follow-ups>
- Re: nmap status question john mathew (Jul 29)
- RE: nmap status question Brad Bemis (Jul 29)
- Re: nmap status question David Vertie (Jul 29)