From owner-freebsd-questions@FreeBSD.ORG Tue Oct 30 21:33:53 2007 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 599BA16A468 for ; Tue, 30 Oct 2007 21:33:53 +0000 (UTC) (envelope-from brent.jones@otago.ac.nz) Received: from mailhub2.otago.ac.nz (mailhub2.otago.ac.nz [139.80.64.247]) by mx1.freebsd.org (Postfix) with ESMTP id CA34013C4CB for ; Tue, 30 Oct 2007 21:33:52 +0000 (UTC) (envelope-from brent.jones@otago.ac.nz) Received: from its-ex-p04.registry.otago.ac.nz (its-ex-p04.registry.otago.ac.nz [10.4.15.133]) by mailhub2.otago.ac.nz (8.13.8/8.13.8) with ESMTP id l9UJhCJ2021659; Wed, 31 Oct 2007 08:43:19 +1300 Received: from its-ex-p04.registry.otago.ac.nz ([10.4.15.138]) by its-ex-p04.registry.otago.ac.nz with Microsoft SMTPSVC(6.0.3790.3959); Wed, 31 Oct 2007 08:43:19 +1300 Received: from MAIL1.registry.otago.ac.nz ([10.4.15.128]) by its-ex-p04.registry.otago.ac.nz with Microsoft SMTPSVC(6.0.3790.3959); Wed, 31 Oct 2007 08:43:18 +1300 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Date: Wed, 31 Oct 2007 08:43:18 +1300 Message-ID: <31AE442CCBC1094ABC40CE85B0149F063E5F94@MAIL1.registry.otago.ac.nz> In-Reply-To: <64c038660710282057o4077f09cr913017aa56a28a79@mail.gmail.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: 192.168.1.1 is on lo0 but got reply from... Thread-Index: Acga/XYiJaqc/2v7T8iL9HYHYy438AAL2UIg References: <64c038660710282057o4077f09cr913017aa56a28a79@mail.gmail.com> From: "Brent Jones" To: "Modulok" , X-OriginalArrivalTime: 30 Oct 2007 19:43:18.0989 (UTC) FILETIME=[1F2277D0:01C81B2D] X-PMX-Version: 5.3.3.310218, Antispam-Engine: 2.5.2.313940, Antispam-Data: 2007.10.30.122330 X-PerlMx-Spam: Gauge=IIIIIII, Probability=7%, Report='__CP_URI_IN_BODY 0, __CT 0, __CTE 0, __CT_TEXT_PLAIN 0, __HAS_MSGID 0, __IMS_MSGID 0, __MIME_TEXT_ONLY 0, __MIME_VERSION 0, __SANE_MSGID 0' Cc: Subject: RE: 192.168.1.1 is on lo0 but got reply from... X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Oct 2007 21:33:53 -0000 You are correct, and that's all it probably means. Someone on your ISP side (and it could be the ISP itself) is using the 192.168 address space. Our ISP here uses the 172.16 private address space for a bunch of stuff, including all their internal mail relays. Cheers, Brent =20 -----Original Message----- From: owner-freebsd-questions@freebsd.org [mailto:owner-freebsd-questions@freebsd.org] On Behalf Of Modulok Sent: Monday, 29 October 2007 4:57 p.m. To: freebsd-questions@freebsd.org Subject: arp: 192.168.1.1 is on lo0 but got reply from... One of my FreeBSD machines acts as a router, providing shared internet access via ipfw/natd to the local network. Recently I've been getting a lot of these in the logs: arp: 192.168.1.1 is on lo0 but got reply from (someEthernetAddress) on xl1 xl1 is my Internet-facing interface. The address 192.168.1.1 is configured on the internal interface, xl0 not xl1. The address mapping for 192.168.1.1 is a permanent entry in the ARP table. 1) After reading the arp(4) manpage am I to assume that someone on my ISP's side of things has something terribly mis-configured? 2) If the local host has a permanent entry for 192.168.1.1, why would it send out an arp request for an address it already knows (is this normal)? Just trying to make sure it's not something I screwed up... -Modulok- _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org"