From owner-freebsd-questions Thu Sep 16 10:13:18 1999 Delivered-To: freebsd-questions@freebsd.org Received: from aag.alaskaair.com (outbound.alaskaair.com [159.49.42.191]) by hub.freebsd.org (Postfix) with SMTP id 8FB1D14BD6 for ; Thu, 16 Sep 1999 10:13:09 -0700 (PDT) (envelope-from elazich@AlaskaAir.com) Received: from OUTBOUND.alaskaair.com by aag.alaskaair.com via smtpd (for hub.FreeBSD.org [204.216.27.18]) with SMTP; 16 Sep 1999 17:16:20 UT Received: from asnasta (asnasta.alaskaair.com [159.49.42.21]) by outbound.alaskaair.com (8.9.3/8.9.3) with SMTP id KAA16687; Thu, 16 Sep 1999 10:03:07 -0700 From: elazich@AlaskaAir.com To: ru@ucb.crimea.ua Cc: freebsd-questions@FreeBSD.ORG Date: Thu, 16 Sep 1999 09:48:16 -0700 Subject: Re: ARP (was: Re: IPFW & NATD) Message-ID: References: <19990913210504.D88685@relay.ucb.crimea.ua> <19990913212704.A98610@relay.ucb.crimea.ua> <19990914204140.C19867@relay.ucb.crimea.ua> <19990916112634.D87554@relay.ucb.crimea.ua> Organization: Alaska Airlines MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit Content-ID: X-Gateway: NASTA Gate 2.0 for FirstClass(R) Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG I see your point, but where I'm confused is that my internal hosts simply have just 10.x.y.z addresses, no bridging that I have setup on the internal network. The only bridging that I am aware of is taking place on my dsl modem (bridge technically). Could this be the source of the problem? Eli ru@ucb.crimea.ua writes: >On Wed, Sep 15, 1999 at 10:47:06AM -0700, elazich@AlaskaAir.com wrote: >> just browsing through my log files and came across this message; >> >> >Sep 13 14:53:28 capricorn /kernel: arp: 10.0.0.2 is on vx0 but got >> >reply from 00:c0:f0:16:2a:8b on lnc1 >> >Sep 13 14:53:29 capricorn /kernel: arp: 10.0.0.2 is on vx0 but got >> >reply from 00:c0:f0:16:2a:8b on lnc1 >> >Sep 13 14:59:01 capricorn /kernel: arp: 10.0.0.2 is on vx0 but got >> >reply from 00:c0:f0:16:2a:8b on lnc1 >> >Sep 13 14:59:06 capricorn last message repeated 3 times >> >> the hw address referenced here is not on my internal network and as >> indicated is being resolved by my external NIC. Why would this be? I >> thought private addresses were not routed and my routing table appears >> to be correct for my network; >> >Aha! >Maybe, there is another host on your local ethernet segment that is >doing >bridging with your external segment (lnc1), and some host on that >external >segment (whose ha==00:c0:f0:16:2a:8b) has an IP address of 10.0.0.2. >This could be easily checked: >(change your local network number) ># ifconfig vx0 inet 10.1.0.1 netmask 255.255.255.0 >(clear the ARP table) ># arp -a -d >(try to ping 10.0.0.2) ># ping 10.0.0.2 >If you'll give a reply from 10.0.0.2, then the above said is true. > >Anyway, you have a problem with your network configuration, not >with IPFW and NATD. > >-- >Ruslan Ermilov Sysadmin and DBA of the >ru@ucb.crimea.ua United Commercial Bank, >ru@FreeBSD.org FreeBSD committer, >+380.652.247.647 Simferopol, Ukraine >http://www.FreeBSD.org The Power To Serve >http://www.oracle.com Enabling The Information Age >To Unsubscribe: send mail to majordomo@FreeBSD.org >with "unsubscribe freebsd-questions" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message