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Re: TCP Syn Flooding
From: Steve Suehring <sec () braingia org>
Date: Tue, 18 Feb 2003 07:56:53 -0600

While I obviously can't guarantee it, I would sincerely doubt that there 
is a true syn flood taking place sourced in the doubleclick network.  What 
were you doing at the time?  Possibly surfing the web?  Those source and 
destination ports look awfully like you were surfing the web and 
doubleclick's side tried to open a connection to you for their load 
balancing software.

My guess would be that the netgear is picking up a false positive.  

Searching deja reveals that this may be the case after all:



On Sat, Feb 15, 2003 at 09:20:46AM -0500, Tim Laureska wrote:
OK. I just installed a Netgear firewall box between a cable modem and a
NT 4.0 server on a small network.. and set it up to email me attempts at
security breaches. I am brand new to these devices and a relative
neophyte to internet/internal network security.  So the question is

I received this message a few times yesterday after I installed the box:

Fri, 02/14/2003 20:35:01 - TCP connection dropped -
Source:, 80, WAN - Destination:, 20306, LAN -
'TCP:Syn Flooding' End of Log ----------

What should I make of this?

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