From owner-freebsd-security@FreeBSD.ORG Mon Oct 27 08:27:05 2003 Return-Path: Delivered-To: freebsd-security@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 6A8EE16A4BF for ; Mon, 27 Oct 2003 08:27:05 -0800 (PST) Received: from lariat.org (lariat.org [63.229.157.2]) by mx1.FreeBSD.org (Postfix) with ESMTP id 366AC43F85 for ; Mon, 27 Oct 2003 08:27:04 -0800 (PST) (envelope-from brett@lariat.org) Received: from runaround.lariat.org (IDENT:ppp1000.lariat.org@lariat.org [63.229.157.2]) by lariat.org (8.9.3/8.9.3) with ESMTP id JAA27729; Mon, 27 Oct 2003 09:26:55 -0700 (MST) X-message-flag: Warning! Use of Microsoft Outlook renders your system susceptible to Internet worms. Message-Id: <6.0.0.22.2.20031027092251.04ad3dd8@localhost> X-Sender: brett@localhost (Unverified) X-Mailer: QUALCOMM Windows Eudora Version 6.0.0.22 Date: Mon, 27 Oct 2003 09:26:20 -0700 To: Jarkko Santala , Kris Kennaway From: Brett Glass In-Reply-To: <20031027120642.A96390@trillian.santala.org> References: <200310270731.AAA23485@lariat.org> <20031027080240.GA9552@rot13.obsecurity.org> <20031027110203.B96390@trillian.santala.org> <20031027093435.GA6111@rot13.obsecurity.org> <20031027120642.A96390@trillian.santala.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" cc: security@freebsd.org Subject: Re: Best way to filter "Nachi pings"? X-BeenThere: freebsd-security@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Security issues [members-only posting] List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 27 Oct 2003 16:27:05 -0000 At 03:17 AM 10/27/2003, Jarkko Santala wrote: >Blocking >all ping packets to improve security is nothing more than security through >obscurity. It may hide your system against the simplest ping probes, but >it does nothing to improve security as such. In our case, there's a more compelling reason. Some of our customers' system administrators have utilities which ping their servers from their home Internet connections to make sure everything's working. If I were to block pings, all of these guys' (and gals') pagers and cell phones would go off at once. I'd be beseiged with demands to remove the block immediately. --Brett