From owner-freebsd-security Wed Nov 7 18:50:29 2001 Delivered-To: freebsd-security@freebsd.org Received: from clmboh1-smtp3.columbus.rr.com (clmboh1-smtp3.columbus.rr.com [65.24.0.112]) by hub.freebsd.org (Postfix) with ESMTP id 9EFE837B405 for ; Wed, 7 Nov 2001 18:50:26 -0800 (PST) Received: from vectra (dhcp235214.columbus.rr.com [204.210.235.214]) by clmboh1-smtp3.columbus.rr.com (8.11.2/8.11.2) with SMTP id fA82k7T27956; Wed, 7 Nov 2001 21:46:07 -0500 (EST) Message-Id: <4.1.20011107214347.0091ce80@pop.service.ohio-state.edu> X-Sender: kennsmit@none (Unverified) X-Mailer: QUALCOMM Windows Eudora Pro Version 4.1 Date: Wed, 07 Nov 2001 21:45:43 -0500 To: freebsd-security@FreeBSD.ORG From: K Smith Subject: Re:firewall question Cc: tomg@trancer.com Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" 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 Tom: I would suggest double checking each IP configuration (including subnet mask). The next step is to use basic tools such as ping, traceroute and arp to determine the behavior of your network. Utilize a traffic analyzer such as tcpdump or ethereal and an ethernet hub (if you are using a switch) if you haven't discovered the source of the problem using the previous steps. Your problem could be complex, but will most likely be caused by a simple configuration error. BTW: You would probably get a better response posting this to a more general Q&A list, as it doesn't particularly pertain to security. Good Luck! ks >I've been playing with setting up a firewall. This is the setup: >The firewall PC is running FreeBSD 4.4 with the default 'simple' firewall >running. There are two ethernet cards in it, one at IP 206.147.211.9 talking >to the outside network. The other ethernet card is using IP 10.0.0.1 and is >talking to an internel network of two PCs. >One PC is running FreeBSD 4.4 and is at IP 10.0.0.2 and the other PC is >running Win98 and is at IP 10.0.0.3. Both are using 10.0.0.1 as the default >gateway. >If both machines are plugged into the network and running everything seems to >be working fine. However as soon as I shut down the Win98 box or unplug it >from the network, the FreeBSD machine can't communicate out of the firewall >anymore. Plug the Win98 box back in and it starts working again. >Any suggestions? TIA >-- >Tom Greenwalt (F.O.E.) Trancer Software Inc. tomg@trancer.com >9099 7th Street NE http://www.trancer.com/ >Minneapolis, MN 55434-1113 http://www.trancer.com/~tomg >---- When I'm good I'm very good, when I'm bad I'm better, ---->---------- But when I'm evil you better run. ------------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message