From owner-freebsd-questions Mon Mar 15 0:10: 4 1999 Delivered-To: freebsd-questions@freebsd.org Received: from relay.ucb.crimea.ua (relay.ucb.crimea.ua [212.110.138.1]) by hub.freebsd.org (Postfix) with ESMTP id 0108C150BC for ; Mon, 15 Mar 1999 00:09:16 -0800 (PST) (envelope-from ru@ucb.crimea.ua) Received: (from ru@localhost) by relay.ucb.crimea.ua (8.9.2/8.9.2/UCB) id KAA75157; Mon, 15 Mar 1999 10:07:09 +0200 (EET) (envelope-from ru) Date: Mon, 15 Mar 1999 10:07:09 +0200 From: Ruslan Ermilov To: geniusj@phoenix.unacom.com Cc: questions@FreeBSD.ORG Subject: Re: SYN attacks Message-ID: <19990315100709.D64525@relay.ucb.crimea.ua> Mail-Followup-To: geniusj@phoenix.unacom.com, questions@FreeBSD.ORG References: <19990314215130.12505.qmail@phoenix.unacom.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.95.3i In-Reply-To: <19990314215130.12505.qmail@phoenix.unacom.com>; from geniusj@phoenix.unacom.com on Sun, Mar 14, 1999 at 09:51:30PM -0000 X-Operating-System: FreeBSD 3.1-STABLE i386 Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Sun, Mar 14, 1999 at 09:51:30PM -0000, geniusj@phoenix.unacom.com wrote: > Hi, if this is directed towards the wrong list, please forward it to the > correct one.. My concern is that our server has been getting some massive > SYN floods from, what we think arespoofed hosts recently. It has brought our > system to its knees, even with its power (Dual 400 512 mb of ram). We would > like to somehow restrict these zombie connections from building up so much > .. I found somewhat of an old kernel patch, but due to the age of it, it isnt > applicable any more. I would like any suggestions on stopping or weakening > these attacks either by kernel patch or ip filtering.. Any suggestions are > welcome. > > Thanks, > Jason DiCioccio man 4 dummynet Cheers, -- Ruslan Ermilov Sysadmin and DBA of the ru@ucb.crimea.ua United Commercial Bank +380.652.247.647 Simferopol, Ukraine http://www.FreeBSD.org The Power To Serve http://www.oracle.com Enabling The Information Age To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message