From owner-freebsd-stable Tue Sep 17 15:30:19 2002 Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.FreeBSD.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 6ABA137B401; Tue, 17 Sep 2002 15:30:17 -0700 (PDT) Received: from sccrmhc02.attbi.com (sccrmhc02.attbi.com [204.127.202.62]) by mx1.FreeBSD.org (Postfix) with ESMTP id 91ACF43E72; Tue, 17 Sep 2002 15:30:16 -0700 (PDT) (envelope-from crist.clark@attbi.com) Received: from blossom.cjclark.org ([12.234.91.48]) by sccrmhc02.attbi.com (InterMail vM.4.01.03.27 201-229-121-127-20010626) with ESMTP id <20020917223015.JXIW7124.sccrmhc02.attbi.com@blossom.cjclark.org>; Tue, 17 Sep 2002 22:30:15 +0000 Received: from blossom.cjclark.org (localhost. [127.0.0.1]) by blossom.cjclark.org (8.12.3/8.12.3) with ESMTP id g8HMUFWn003712; Tue, 17 Sep 2002 15:30:15 -0700 (PDT) (envelope-from crist.clark@attbi.com) Received: (from cjc@localhost) by blossom.cjclark.org (8.12.3/8.12.3/Submit) id g8HMUEgs003711; Tue, 17 Sep 2002 15:30:14 -0700 (PDT) X-Authentication-Warning: blossom.cjclark.org: cjc set sender to crist.clark@attbi.com using -f Date: Tue, 17 Sep 2002 15:30:14 -0700 From: "Crist J. Clark" To: Chris Byrnes Cc: questions@FreeBSD.ORG Subject: Re: arplookup xx.xxx.xx.xxx failed: host is not on local network Message-ID: <20020917223014.GB3323@blossom.cjclark.org> Reply-To: "Crist J. Clark" References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4i X-URL: http://people.freebsd.org/~cjc/ Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG [Inappropriate cross-post to -stable removed.] On Sun, Sep 15, 2002 at 02:08:51PM -0500, Chris Byrnes wrote: > My /var/log/messages is being filled, non-stop, by these errors looped: > > Sep 15 13:41:28 servername /kernel: arplookup xx.xxx.xx.xxx failed: host is > not on local network > Sep 15 13:41:28 servername /kernel: arplookup xx.xxx.xx.xxx failed: host is > not on local network > > After doing some reading, I've already issued, "sysctl -w > net.link.ether.inet.log_arp_wrong_iface=0" thinking that would fix the > problem. Unfortunately, it has not. > > Any ideas? This is a netmask problem, but not really the one that other people have described. This is how it usually works. Your troubled machine above, "servername," receives an ARP who-has from another machine on the LAN called "clientname." However, the IP address that clientname gives as a source does not match up to any local networks that servername knows about. For example, say servername has an address of 192.0.2.10/25. The other machine has 192.0.2.210/24. When servername gets an ARP (which is broadcast so servername gets it fine), who-has 192.0.2.10 tell 192.0.2.210 It gets confused. 192.0.2.210 is not local (as far as it is concerned) so it logs an error. Note that this is not a harmless error. These two machine cannot talk to each other. The fix, of course, is to make sure all machines on the same LAN have the same netmask. -- 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-stable" in the body of the message