Date: Thu, 16 Sep 1999 11:26:34 +0300 From: Ruslan Ermilov <ru@ucb.crimea.ua> To: elazich@AlaskaAir.com Cc: freebsd-questions@FreeBSD.ORG Subject: ARP (was: Re: IPFW & NATD) Message-ID: <19990916112634.D87554@relay.ucb.crimea.ua> In-Reply-To: <msg1226967.thr-894a72.4c526e@alaskaair.com>; from elazich@AlaskaAir.com on Wed, Sep 15, 1999 at 10:47:06AM -0700 References: <msg1219643.thr-894a72.4c526e@alaskaair.com> <19990913210504.D88685@relay.ucb.crimea.ua> <msg1220105.thr-894a72.4c526e@alaskaair.com> <19990913212704.A98610@relay.ucb.crimea.ua> <msg1220314.thr-894a72.4c526e@alaskaair.com> <msg1223309.thr-894a72.4c526e@alaskaair.com> <19990914204140.C19867@relay.ucb.crimea.ua> <msg1226967.thr-894a72.4c526e@alaskaair.com>
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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. <PS> Anyway, you have a problem with your network configuration, not with IPFW and NATD. </PS> -- 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
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