From owner-freebsd-security Thu Aug 16 10:31:55 2001 Delivered-To: freebsd-security@freebsd.org Received: from albatross.prod.itd.earthlink.net (albatross.mail.pas.earthlink.net [207.217.120.120]) by hub.freebsd.org (Postfix) with ESMTP id B2D9D37B406 for ; Thu, 16 Aug 2001 10:31:50 -0700 (PDT) (envelope-from cjc@earthlink.net) Received: from blossom.cjclark.org (dialup-209.245.128.59.Dial1.SanJose1.Level3.net [209.245.128.59]) by albatross.prod.itd.earthlink.net (EL-8_9_3_3/8.9.3) with ESMTP id KAA12074; Thu, 16 Aug 2001 10:31:39 -0700 (PDT) Received: (from cjc@localhost) by blossom.cjclark.org (8.11.4/8.11.3) id f7GGwrA05061; Thu, 16 Aug 2001 09:58:53 -0700 (PDT) (envelope-from cjc) Date: Thu, 16 Aug 2001 09:58:53 -0700 From: "Crist J. Clark" To: "Carroll, D. (Danny)" Cc: freebsd-security@FreeBSD.ORG Subject: Re: IPFW and dynamic rules. Message-ID: <20010816095853.D4232@blossom.cjclark.org> Reply-To: cjclark@alum.mit.edu References: <98829DC07ECECD47893074C4D525EFC31176AD@citsnl007.europe.intranet> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <98829DC07ECECD47893074C4D525EFC31176AD@citsnl007.europe.intranet>; from Danny.Carroll@mail.ing.nl on Thu, Aug 16, 2001 at 03:27:50PM +0200 Sender: owner-freebsd-security@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org On Thu, Aug 16, 2001 at 03:27:50PM +0200, Carroll, D. (Danny) wrote: [snip] > Is it possible to set up a rule that works a little like this: > > internal host A connects to external host B > ipfw or natd then makes a dynamic rule that allows any traffic (or > traffic from specific ports) from host B back into the network. > After 5 minutes of inactivity, the rule is discarded. [snip] > Can it be done? Yes. Patches welcome. -- Crist J. Clark cjclark@alum.mit.edu To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message