Re: [PEN-TEST] Detecting the presence of a firewall

From: David Wray (davew@sec-tec.com)
Date: Mon May 14 2001 - 04:30:32 PDT

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    Hi
    
    1. If memory serves me correct (and it frequently doesn't), open TCP ports
    256,257 and 258 are a good indication. I have also noticed that NMAP can
    often detect Check Point Firewall-1 using the fingerprinting option, and it
    seems to be quite accurate.
    
    2. There is probably a fair easier way of doing this, but if I want to find
    the internal IP address scheme, I often try to perform a download VPN
    topology request using Checkpoint Secureclient. Once the download is done,
    any request for the Internal IP address scheme will prompt for a username
    and password. Of course this method is far from perfect and makes all sorts
    of assumptions (VPN license, correctly configured encryption domain, non
    authenticated topology requests are allowed etc), but its better than
    nothing, sometimes, maybe.
    
    Regards
    
    Dave Wray
    Sec-Tec Ltd
    -------
    > Pl clarify the following
    > 
    > 1. Are there any means of detecting the presence of a
    > checkpoint firewall at a company's premises,  from a
    > remote location.
    > 
    > 2.Knowing one interface of the firewall machine, is it
    > possible for me to find the ip addresses of the other
    > interfaces.
    > 
    > Kindly reply at the earliest.
    > 
    > Priya
    > 
    > 
    > 
    > 
    > 
    > 
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