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.




Network Security Nessus-Users
[Top] [All Lists]
<prev [Date] next>
[Advanced]
 <prev [Thread] next>

Re: How to scan target host without checks if it alive?

from [Michel Arboi] Network Security [Permanent Link]
Subject: Re: How to scan target host without checks if it alive?
Date: Tue, 24 Jun 2008 14:10:12 +0200 
Le Tue, 24 Jun 2008 14:44:56 +0400,
"Taras Ivashchenko" <naplanetu@gmail.com> a Ãcrit :


There are a lot of hosts with disabled ICMP.
So how Nessus determine if these hosts alive?


With ARP, TCP, or UDP.

ARP only works on the local network.

TCP works by sending SYN packets on several "common" ports. If it
receives an answer (any TCP packet: SYNACK, RST...) the host is supposed to
be "up". You may have false positive with transparent web proxies (on
port 80) or some firewall rules (rejecting port 139, 445 or 113). This
can be fixed by changing the default port set.

UDP is slow  and works only a couple of protocols (DNS, RPC RIP v1 & v2)


I want to scan these hosts by full port range without any checks of
it's alive state.


If you disable all ping options in the plugin Preferences, all hosts
will be considered as up.
_______________________________________________
Nessus mailing list
Nessus@list.nessus.org
http://mail.nessus.org/mailman/listinfo/nessus
[More messages with this same subject...]




<Prev in Thread] Current Thread [Next in Thread>
Previous by Date:  How to scan target host without checks if it alive?, Taras Ivashchenko
Next by Date:  TemplatesXSL for ".nessus" format, Crusade, Jennifer
Previous by Thread:  How to scan target host without checks if it alive?, Taras Ivashchenko
Next by Thread:  TemplatesXSL for ".nessus" format, Crusade, Jennifer
Indexes:  [Date] [Thread] [Top] [All Lists]