From owner-freebsd-net@FreeBSD.ORG Thu Nov 17 06:23:20 2005 Return-Path: X-Original-To: freebsd-net@freebsd.org Delivered-To: freebsd-net@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 3C1CB16A41F for ; Thu, 17 Nov 2005 06:23:20 +0000 (GMT) (envelope-from kaakun@highway.ne.jp) Received: from mx.highway.ne.jp (pip8.gate01.com [61.122.117.246]) by mx1.FreeBSD.org (Postfix) with ESMTP id EA84543D45 for ; Thu, 17 Nov 2005 06:23:19 +0000 (GMT) (envelope-from kaakun@highway.ne.jp) Received: from [202.213.251.158] (helo=[192.168.20.8]) by pop11.isp.us-com.jp with esmtp (Mail 4.20) id 1EcdB0-0002Q8-HR for freebsd-net@freebsd.org; Thu, 17 Nov 2005 15:23:18 +0900 Message-ID: <437C21AF.2070107@highway.ne.jp> Date: Thu, 17 Nov 2005 15:22:39 +0900 From: Kazuaki Oda User-Agent: Mozilla Thunderbird 1.0.6 (X11/20050731) X-Accept-Language: en-us, en MIME-Version: 1.0 To: freebsd-net@freebsd.org Content-Type: text/plain; charset=ISO-2022-JP Content-Transfer-Encoding: 7bit Subject: carp backup host replies to arp-request X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 17 Nov 2005 06:23:20 -0000 Hi list, I have set up 2 routers with FreeBSD 6.0-RELEASE. They are using carp interfaces, so one is a master router and another is a backup. They seemed to work fine, but a few days later I noticed that not only master router but also backup router replies to arp-requests of the common IP address from a layer 3 switch. This behavior confuses the switch, and sometimes it makes the switch to send a packet addressed to the common IP address to the port which is connected to backup router. I googled and found that OpenBSD fixed this problem in ip_carp.c 1.62. I hope that someone import this into FreeBSD... -------------------- Kazuaki Oda