full-disclosure - Re: SYN ACK scans to random ports

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Message-ID: <5241E1E3.5070903@oelgoetze.de>
Date: Tue, 24 Sep 2013 21:02:59 +0200
From: Jan Murawski <der@...goetze.de>
To: full-disclosure@...ts.grok.org.uk
Subject: Re: SYN ACK scans to random ports

For example nmap can randomize the list of scanned ports. I guess, that
is supposed to confuse people :)


Le 24/09/2013 16:34, Fabio a écrit :
> Il 24/09/13 14:49, silence_is_best@...hmail.com ha scritto:
>> Can someone explain the point of a SYN ACK scan to random high ports?  I
>> usually see a fair amount of these...at first I thought it was maybe a
>> block to an initiating SYN packet, but I don't see any evidence that the
>> SYN ACK isn't the first packet seen.  Danke.
> 
> 
> Typically an ACK or SYN ACK scan is used to map out firewall rulesets,
> determining whether they are stateful or not and which ports are filtered.
> 
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