From owner-freebsd-security Mon Aug 21 15:28: 3 2000 Delivered-To: freebsd-security@freebsd.org Received: from ibb0021.ibb.uu.nl (ibb0021.ibb.uu.nl [131.211.124.21]) by hub.freebsd.org (Postfix) with ESMTP id 39D1B37B423 for ; Mon, 21 Aug 2000 15:28:00 -0700 (PDT) Received: by ibb0021.ibb.uu.nl (Postfix) id D64D17B1; Tue, 22 Aug 2000 00:27:17 +0200 (CEST) Date: Tue, 22 Aug 2000 00:27:17 +0200 From: Mipam To: William Wong Cc: Bill Fumerola , freebsd-security@FreeBSD.ORG Subject: Re: icmptypes Message-ID: <20000822002717.A14704@ibb0021.ibb.uu.nl> Reply-To: mipam@ibb.net References: <007701c00b4f$9c905340$4c9409cb@labyrinth.net.au> <003c01c00bb7$94783340$0300a8c0@anime.ca> <20000821173714.D57333@jade.chc-chimes.com> <006301c00bbb$13b9afa0$0300a8c0@anime.ca> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <006301c00bbb$13b9afa0$0300a8c0@anime.ca>; from willwong@anime.ca on Mon, Aug 21, 2000 at 05:59:26PM -0400 X-Obviously: All email clients suck. Only Mutt sucks less! X-Editor: Vi X-Operating-System: BSD Sender: owner-freebsd-security@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org > I tried to "reset icmp" and it said that reset it only valid for tcp > packets. Would the polite way be to use some sort of "unreach" code? > Yup, a normal response when you send a machine a ping packet and it's not up, the router will send you an icmp unreachable back (icmp type 3). That's what you can do as well as response to a icmp packet to be polite i guess. On the other hand.. consider letting icmp types 0,3,8 and 11 through as was discussed before. And just drop all fragmented icmp packets. Or perhaps only allow 0 and 11 in. Bye, Mipam. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message