RE: Open ports

["Shenk, Jerry A" <jshenk () decommunications com>]

Check the ports on some of those "all open" IPs while running tcpdump or some other sniffer to capture the stimulus and 
response traffic and manually examine it.  You might be looking at a 'tarpit' or perhaps a firewall that reports 
eveeything as open...some of the Symantec firewalls do that.

You might want to also compare traffic from some of these "all open" IPs with some others that have ports open and act 
more "normal".  You would want to specifically look at IPids, ttls and window sizes.  Other fields may be interesting 
also but this is what i'd look at first.

-----Original Message-----
From: "skynetonsecurity () gmail com" <skynetonsecurity () gmail com>
To: "pen-test () securityfocus com" <pen-test () securityfocus com>
Sent: 8/15/08 3:58 PM
Subject: Open ports

Hi Guys,

I am doing pen-testing for pool of IP's, During pen-test I observed  that some IP's  are giving all  ports open i.e. 
65535 in NMAP  result  &  Nessus is giving empty result.

What could be the reason for this?





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