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Network Security Nessus-Users
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Re: tcp port scanner plugin

Subject: Re: tcp port scanner plugin
Date: Tue, 30 Oct 2007 11:40:31 +0100
On Tue, 30 Oct 2007 11:35:58 +0100
"Kevin Mc Grath" <kpmcgrath81@gmail.com> wrote:

Typically I use the Nessus Server/Client setup. However today I must
use the stand-alone Windows version. I was unable to locate the "tcp
port scanner" (plugin ID: 10335) in the Windows version

IIRC, this plugin is not part of the Windows version, as it would be
horribly slow.
1. Windows XP SP2 limits the number of half open connections =>
parallelism would be greatly reduced, which has an impact on firewalled
machines.
2. Windows IP stack retransmits SYN packets when it receives a RST!
From the scanner point of view, it would seem that the RTT to a target
on your LAN is ~ 2 s, which would once again result in horrible
performances.

So, use the SYN scanner.
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