Re: Server blocks access of IP after nmap scan

[Todd Haverkos <infosec () haverkos com>]

amon.amarth9 () gmail com writes:

> Nice explained. Anyway, the problem is that although this can be
> effective defense structure, when not configured properly it can
> block legitimate users too. 

Indeed.  

For example, what if the attacker decides to spoof traffic pretending
to be from... oh, the IP's of the 13 root dns servers? 

The misconfigured environment would then suddenly have one hell of a
time resolving new DNS queries.  So, care must be taken for such
defenses. 

Nmap's idle scan rules for this sort of thing.  Finding good idle
zombies becomes the fun.

--
Todd Haverkos, LPT MsCompE
http://haverkos.com/

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