Great Circle Associates Firewalls
(September 1996)
 

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Subject: Re: SYN floods - possible solution?(update)
From: scs @ lokkur . dexter . mi . us (Steve Simmons)
Organization: Inland Sea
Date: 13 Sep 1996 11:41:33 -0400
To: firewalls @ GreatCircle . COM
Distribution: local
Newsgroups: local.firewalls
References: <Pine . SOL . 3 . 95 . 960913110653 . 16566A-100000 @ tartarus>

"Roderick Murchison, Jr." <murchiso @
 vivid .
 newbridge .
 com> writes:

>That's where the filtering comes in.  We would detect and halt a large
>grouping of SYN's with the same source IP and drop them.  THis still does
>not protect the firewall from getting hit with a flurry of SYN's with
>random source IP's, but it should keep the firewall from being used as a
>proxy for the attack.

Yes, if you record the source address you solve this problem.
-- 
  "Yea, the heavens shall open and the NP-complete solution given forth.
ATT executives shall give birth to two-headed operating systems, and 
copyrights shall be expunged.  The voice of the GNU shall be heard, but
the faithless will be without transcievers."   -- me


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