Re: Nmap issues...? or router?

[Blake Frantz <blake () mc net>]

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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