From owner-freebsd-questions@FreeBSD.ORG Thu Apr 25 01:52:24 2013 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by hub.freebsd.org (Postfix) with ESMTP id 2507D1CB for ; Thu, 25 Apr 2013 01:52:24 +0000 (UTC) (envelope-from kayasaman@gmail.com) Received: from mail-we0-x234.google.com (mail-we0-x234.google.com [IPv6:2a00:1450:400c:c03::234]) by mx1.freebsd.org (Postfix) with ESMTP id B3E131839 for ; Thu, 25 Apr 2013 01:52:23 +0000 (UTC) Received: by mail-we0-f180.google.com with SMTP id x43so2124284wey.11 for ; Wed, 24 Apr 2013 18:52:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:message-id:date:from:user-agent:mime-version:to:subject :content-type:content-transfer-encoding; bh=ueO+iXCJXbfnR+xaXpdhLpSEk7PeCXUFzZp+0VhA9Wo=; b=FGGdLVNlJV7AoKFVa2tA+3MzzaXuecpncSTk65TOG1Kb5/gmwsSZNFw7WwHi/LAv90 gd7Ths4TnFION5OCHGua6hOteRh1V9UOUt/RdLJNoVauXhats3Dgr4NonXrxFapoiZZt 9CpwRTToRiIRx7ARHTUF39Dnfy+E7ewJ94oLAtIu086xBSEb9B2GGtcZxV1EnVRWSyUm b1JkqG5VZ0JCrNVGwEZu62LcNiV5w4wvyuU3j0aep1POTI3zZ5A0uu+/v5SbYDjCCSJI XvdQkQGkozS05xNy+osrW14EO/y+2221lsD0XwvnekNuXSaE7bfL01h6n4CFgmdtnANA OYZQ== X-Received: by 10.180.105.195 with SMTP id go3mr654065wib.2.1366854742881; Wed, 24 Apr 2013 18:52:22 -0700 (PDT) Received: from X220.optiplex-networks.com (81-178-2-118.dsl.pipex.com. [81.178.2.118]) by mx.google.com with ESMTPSA id fz3sm7743652wib.0.2013.04.24.18.52.21 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 24 Apr 2013 18:52:22 -0700 (PDT) Message-ID: <51788C55.6040009@gmail.com> Date: Thu, 25 Apr 2013 02:52:21 +0100 From: Kaya Saman User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130407 Thunderbird/17.0.5 MIME-Version: 1.0 To: freebsd-questions@freebsd.org Subject: Unknown IP address shows FreeBSD server MAC in arp cache Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Apr 2013 01:52:24 -0000 Hi, I'm experiencing a weird problem and I have no idea where to begin with this one! Basically what's happening is that I did a host scan from my NetBSD box running Cacti in order to 'Auto Discover' machines on my network; a php script on the Cacti server added an IP address xxx.xxx.1.52. Seeing this as odd since I haven't configured any machine with this IP as it's in the DHCP range on my network and there aren't any machines running on DHCP on the particular VLAN either as everything is statically configured; I proceeded to check the arp cache of my NetBSD box which pointed to the MAC address of my FreeBSD server? Having a look round my network and servers each ping attempt to xxx.xxx.1.52 gives me a response and in the arp cache of each machine/device shows the FreeBSD server. Long ago I may have had this machine on xxx.xxx.1.52 but I can't recall and all settings in /etc/rc.conf for interfaces and Jails are fine and consistent with my Network Spec. My network has also had a massive overhaul since then as I've changed switches and router in the meantime too.... I have thought about arp poisoning but then again no other machine is connected to my network that I don't know about and since it's a home network there's really only me connected to it. Also I'm running OpenBSD as a firewall/router gateway which I've also checked thoroughly including Packet Filter and haven't found any issues. I also thought about RARP and bootparamd since I'm running a bunch of Sun SPARC systems in which I NetBooted but nothing on that front either showed any result. I additionally have checked the /etc/hosts files of all my systems and even my local DNS db files but nothing shows xxx.xxx.1.52 at all. The BSD version that I'm running on my FreeBSD server is 8.2 x64. Would anyone be able to help me out with this one? Basically why is a rogue or unknown IP address pointing to my FreeBSD box's NIC? Regards, Kaya