From: Kaj Huisman (kaj.huisman@gmail.com)
Date: Wed Aug 10 2005 - 08:25:18 EDT
Aleph One wrote:
> Hi all,
> I faced a problem running two tools producing totally different results.
> What i did is described as ...I ran nmap on a IP with these parameters
> : syn scan,dont ping,very verbose ,aggressive scan..it showed ports 80
> n 1723 filtered.I ran this scan from Linux box.
> Same time ,i used netwag to scansame ip which showed these ports open.
>
> What can be the problem..??please help.
>
> Aleph
>
A nmap syn scan does not initiate a full connection, it sends a syn in
the hope it will recieve a syn-ack to wich it will then respond with a
rst (iirc).
I could not directly extract from the netwox site what type of scan they
utilise (perhaps a 'full connect' scan ?).
Anyway. a 'full connect' scan (one that performs the complete three-way
handshake will _always_ (?) be the most reliable.
My sugeestion is to perform either a nmap connect scan on the ports from
both results or to manually telnet to the ports and see the response.
Hope that helps, G'Day
Kaj
PS: The manual page for nmap contains more information about how
different scans produce different reports, the protocols are just
guidelines for the manufacturers, implementations may vary.
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