From mboxrd@z Thu Jan 1 00:00:00 1970 From: Elver Loho Subject: Matching misc TCP header fields Date: Thu, 14 Aug 2003 08:27:11 +0300 Sender: netfilter-admin@lists.netfilter.org Message-ID: <200308140827.11478.kernelpenguin@hot.ee> References: <20030814182810.GA2123@linux.local> Reply-To: kernelpenguin@hot.ee Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20030814182810.GA2123@linux.local> Content-Disposition: inline Errors-To: netfilter-admin@lists.netfilter.org List-Help: List-Post: List-Subscribe: , List-Id: List-Unsubscribe: , List-Archive: Content-Type: text/plain; charset="us-ascii" To: netfilter@lists.netfilter.org Any quick hints on how to match misc TCP header fields such as the window size? This new "worm" out there that sends portscans from spoofed IP addresses setting window size to 55808 is pretty interesting. I've captured some interesting traffic with that window size using tcpdump. How to do the same using netfilter? Quick search on the manpage didn't reveal anything related. Same result with a quick google query. Elver