"portscans" (was Re: Arbor Networks DoS defense product)

JC Dill nanog at vo.cnchost.com
Sun May 19 15:21:23 UTC 2002


On 07:50 AM 5/19/02, Ralph Doncaster wrote:
 >
 >> RD> I often like to know if a particular web server is running Unix or
 >> RD> Winblows.  A port scanner is a useful tool in making that 
determination.
 >>
 >> [allan at ns1 phpdig]$ telnet www.istop.com 80
 >> Trying 216.187.106.194...
 >> Connected to dci.doncaster.on.ca (216.187.106.194).
 >> Escape character is '^]'.
 >> HEAD / HTTP/1.0
 >>
 >> HTTP/1.1 200 OK
 >> Date: Sun, 19 May 2002 01:47:57 GMT
 >> Server: Apache/1.3.22 (Unix) FrontPage/4.0.4.3 PHP/4.1.2 mod_fastcgi/2.2.8
 >
 >Sure, it works on some servers, but try it on yahoo.com, cnn.com, ...

<http://uptime.netcraft.com/up/graph/?mode_u=off&mode_w=on&site=www.cnn.com>

Works for me, works from any system that has a browser.  At any given time 
I'm *far* more likely to have a browser running than port scanning 
software, so this solution is also IMHO faster.

jc




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