If you are familiar with nmap, you can use that to scan a host (if you know
what type of host that is). Scans can be done on common service ports like
25, 53 (udp), 80, 443, 445, etc. and would tell you about the status of the
host in question. For udp ports you can try PU switch to send out udp
probes.
nmap -vv -n -sP -PT80 x.x.x.x
The above command from any linux/solaris/bsd host capable of doing nmap from
command line would accomplish a scan on the targeted host with the ip
address denoted by x.x.x.x and would find out if it is listening on tcp port
80, for instance. The scan process could take a long time if you chose to
scan all 65335 ports.
The following command could also accomplish scan of a range of ip address by
means of a simple ping scanning:
nmap -vv -n -sP x.x.x.x/yy
Once you know which hosts are up, just use nessus to do vulnerability
scanning of hosts that are up.
Hope this helps.
S
----- Original Message -----
From: <chmod077@gmx.de>
To: <Nessus@list.nessus.org>
Sent: Saturday, January 29, 2005 2:34 PM
Subject: ping before scan of the host
Dear scanners,
I have to scan a range of IP's automatically (via commandline)
e.g. 10.1.2.0/16.
And I really do not know, which IP's are online.
I want to prevent my scan from taking hours or days because
of waiting for timeouts....
I read about switching off the nmap portscans inside Nessus because of
timing problems.
So I think about doing a ping before scanning
each of the boxes.
Can this ping being done inside the Nessus scan?
If yes, what is to do?
OR
Is it better to
first do a nmap-ping-scan > file_of_IP_alive
then do the nmap-scan with [file_of_IP_alive] as input ?
would be nice to get a hint.
Thank you all.
--
NCSISU
Non Certified Security Information Systems User
GMX im TV ... Die Gedanken sind frei ... Schon gesehen?
Jetzt Spot online ansehen: http://www.gmx.net/de/go/tv-spot
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