Ethical Hacking Learn to find vulnerabilities before the bad guys do! Gain real world hands on hacking experience in our state of the art hacking lab. Course designed and taught by expert instructors with years of penetration testing experience. 12 student maximum in every class. Certification attempt included in every package. | Computer Forensics Training at InfoSec Institute Gain the in-demand skills of a certified computer examiner, learn to recover trace data left behind by fraud, theft, and cybercrime perpetrators. Discover the source of computer crime and abuse at your organization so that it never happens again. All of our class sizes are guaranteed to be 12 students or less to facilitate one-on-one interaction with one of our expert instructors. |

| Subject: | RE: how nmap can know my firewalled servers ? |
|---|---|
| Date: | Wed, 12 Apr 2006 15:11:16 -0700 |
Some kinds of firewalls may respond to a blocked connection attempt with: a) an RST packet (some hosts do this too), or b) an ICMP prohibited/unreachable packet. Some firewalls offer you a choice between "block" (send such a response) and "drop" (no response) actions. David Gillett
-----Original Message----- From: Alexey Eremenko [mailto:al4321@gmail.com] Sent: Wednesday, April 12, 2006 11:24 AM To: security-basics@securityfocus.com Subject: how nmap can know my firewalled servers ? Hi all ! I know that "nmap" can show open ports. But nmap also shows my firewalled ports ! How? Since some servers (like apache) are firewalled with iptables, how can nmap know wherever my system run the service with open port, filtered port or doesn't run it at all ?
------------------------------------------------------------------------- This List Sponsored by: Webroot Don't leave your confidential company and customer records un-protected. Try Webroot's Spy Sweeper Enterprise(TM) for 30 days for FREE with no obligation. See why so many companies trust Spy Sweeper Enterprise to eradicate spyware from their networks. FREE 30-Day Trial of Spy Sweeper Enterprise http://www.webroot.com/forms/enterprise_lead.php --------------------------------------------------------------------------
| Previous by Date: | Re: how nmap can know my firewalled servers ?, Nathaniel Hall |
|---|---|
| Next by Date: | Re: how nmap can know my firewalled servers ?, Harrison Holland |
| Previous by Thread: | Re: Fwd: Re[2]: how nmap can know my firewalled servers ?, Ansgar -59cobalt- Wiechers |
| Next by Thread: | RE: how nmap can know my firewalled servers ?, Burton Strauss |
| Indexes: | [Date] [Thread] [Top] [All Lists] |