From owner-freebsd-stable Tue Dec 17 15:27:51 2002 Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 25A6637B401 for ; Tue, 17 Dec 2002 15:27:50 -0800 (PST) Received: from malasada.lava.net (malasada.lava.net [64.65.64.17]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1052543EE1 for ; Tue, 17 Dec 2002 15:27:49 -0800 (PST) (envelope-from cliftonr@lava.net) Received: from localhost (1861 bytes) by malasada.lava.net; Tue, 17 Dec 2002 13:27:42 -1000 (HST) via sendmail [stdio] id for Date: Tue, 17 Dec 2002 13:27:41 -1000 From: Clifton Royston To: Craig Boston Cc: stable@freebsd.org Subject: Re: ipfilter / ipnat quandry Message-ID: <20021217132741.D26691@lava.net> References: <1040165976.4062.8.camel@owen1492.it.oot> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: <1040165976.4062.8.camel@owen1492.it.oot>; from craig@meoqu.gank.org on Tue, Dec 17, 2002 at 04:59:37PM -0600 Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Tue, Dec 17, 2002 at 04:59:37PM -0600, Craig Boston wrote: > On Tue, 2002-12-17 at 13:02, Clifton Royston wrote: > > ipf does have the ability to more correctly simulate a closed port. > > I did a similar exercise on my personal OpenBSD firewall box earlier > > this year; I won't go through your whole ruleset, but basically for > > every TCP port you block, you need to add a return-rst, and for every > > UDP port you block, you need to add return-icmp(port-unr). This > > provides a pretty good simulation of a host running no services, if > > that's what you want to look like. > > Does ipfw or ipf have the ability to return a SYN/ACK packet for each > incoming SYN, and return an appropriate ACK any incoming ACK packets? That's a very amusing idea, especially when applied to non-assigned IP addresses behind a firewall. I don't know and haven't checked the docs. -- Clifton -- Clifton Royston -- LavaNet Systems Architect -- cliftonr@lava.net "If you ride fast enough, the Specialist can't catch you." "What's the Specialist?" Samantha says. "The Specialist wears a hat," says the babysitter. "The hat makes noises." She doesn't say anything else. Kelly Link, _The Specialist's Hat_ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message