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Re: Nmap issues...? or router?
From: Blake Frantz <blake () mc net>
Date: Sun, 7 Oct 2001 20:26:14 -0500 (CDT)


This can happen if the net you are scanning from has more bandwidth than
the medium connecting you to the target machine (when no traffic shaping
mechanism is inplace).

Concider the following:


+---------+
| Scanner |
+----+----+
     |
     |  1000 mbit
     |
+----+----+     
| Switch  |
+----+----+
     |
     |
     |
+----+----+
| Router  |
+----+----+
     |
     |  DS-3
     |
+----+----+
| Switch  |
+----+----+
     |
     |
     |
+----+----+  
| Target  |  
+---------+


-Blake

On 7 Oct 2001, bluefur0r bluefur0r wrote:

After just completeing an audit for a company that has a DS-3 connection (shared) and a cisco router (2015), One of 
the first issues that was found was this: When nmaping using -sS and all ports, 1 nmap scan nmaping 1 host at a time 
appeared to completely destroy their bandwidth... Has anyone heard of this? Could this be a Router or ISP problem??? 
It took very long to complete because i needed to use the -T Polite option. I'm just curious if anyone else has ever 
encountered nmap using up all network resources for such a high volume connection. Any help would be appreciated so 
this never happens again. *Luckily I started after hours*
blue

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