From owner-freebsd-questions Sat Jan 12 14:33:14 2002 Delivered-To: freebsd-questions@freebsd.org Received: from snipe.prod.itd.earthlink.net (snipe.mail.pas.earthlink.net [207.217.120.62]) by hub.freebsd.org (Postfix) with ESMTP id DFD2D37B400 for ; Sat, 12 Jan 2002 14:33:07 -0800 (PST) Received: from dialup-209.245.142.29.dial1.sanjose1.level3.net ([209.245.142.29] helo=blossom.cjclark.org) by snipe.prod.itd.earthlink.net with esmtp (Exim 3.33 #1) id 16PWhz-0005ks-00; Sat, 12 Jan 2002 14:33:04 -0800 Received: (from cjc@localhost) by blossom.cjclark.org (8.11.6/8.11.3) id g0CMX2P21550; Sat, 12 Jan 2002 14:33:02 -0800 (PST) (envelope-from cjc) Date: Sat, 12 Jan 2002 14:33:01 -0800 From: "Crist J . Clark" To: Bernie Cc: freebsd-questions@FreeBSD.ORG Subject: Re: ipfw logging + rules -- newbie Message-ID: <20020112143301.C20890@blossom.cjclark.org> References: <20020112115756.C13242-100000@BLAST> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <20020112115756.C13242-100000@BLAST>; from Bernie_X@myrealbox.com on Sat, Jan 12, 2002 at 12:08:34PM +0200 X-URL: http://people.freebsd.org/~cjc/ Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Sat, Jan 12, 2002 at 12:08:34PM +0200, Bernie wrote: [snip] > in the /var/log/security i get many blocking messages, > blocked by the last 'default' rule saying: > > /kernel: ipfw: 65435 Deny P:2 194.x.x.x 224.0.0.1 in via tun0 Those are IGMP packets. > 1. should i allow this ip? if i can connect to the isp with > no problem, why does it want to connect to me? is this normal > on dialup connections? Yes, it's pretty normal. The ISP's routers are trying to figure out if your machine wants to/knows how to speak multicast. > 2. in the line above, what does the 'P:2' means? IP Protocol 2, IGMP. See protocols(5) and /etc/protocols. > and the > 244.0.0.1? ^ (you mean 224) The destination IP address. It's the "all systems" multicast address. > 3. is there any way to see more extensive info of the firewall > log, ie more details? Not really. I've got some patches that enable additional information in the URL below. -- "It's always funny until someone gets hurt. Then it's hilarious." Crist J. Clark | cjclark@alum.mit.edu | cjclark@jhu.edu http://people.freebsd.org/~cjc/ | cjc@freebsd.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message