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Network Security Security-Basics
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Re: Is this normal?

Subject: Re: Is this normal?
Date: Wed, 27 Oct 2004 12:56:58 -0400
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On Oct 27, 2004, at 8:35 AM, Barrie Dempster wrote:

On Fri, 2004-10-22 at 12:34 -0300, Joe Polk wrote:
It's not necessarily unusual. Someone is scanning for open ports and such and
is attempting to come in.
<snip>

They most certainly are not, in this case.
You can't scan for open ports if the packets contain a fake return
address like this. In order for the scanning machine to know that a port
is open it requires something to be sent back (ie.. SA). as has been
mentioned before this is most likely a syn flood type attack.


--
Barrie Dempster (zeedo) - Fortiter et Strenue

  http://www.bsrf.org.uk

[ gpg --recv-keys --keyserver www.keyserver.net 0x96025FD0 ]


Wouldn't the -D option let you do a decoy scan? This would let you make a scan look like it is coming from some other place or dummy host.


Ken Swain
mail: ken@kenswain.com
im: aim:krswain190
web: kenswain.com
"/dev/geek"
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