From owner-freebsd-stable@FreeBSD.ORG Thu Sep 15 15:50:19 2011 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 70218106566B for ; Thu, 15 Sep 2011 15:50:19 +0000 (UTC) (envelope-from ml@my.gd) Received: from mail-bw0-f54.google.com (mail-bw0-f54.google.com [209.85.214.54]) by mx1.freebsd.org (Postfix) with ESMTP id 065588FC0C for ; Thu, 15 Sep 2011 15:50:17 +0000 (UTC) Received: by bkbzs8 with SMTP id zs8so3300687bkb.13 for ; Thu, 15 Sep 2011 08:50:16 -0700 (PDT) Received: by 10.204.142.200 with SMTP id r8mr870384bku.213.1316100264207; Thu, 15 Sep 2011 08:24:24 -0700 (PDT) Received: from dfleuriot-at-hi-media.com ([83.167.62.196]) by mx.google.com with ESMTPS id p8sm3776864bkk.3.2011.09.15.08.24.21 (version=SSLv3 cipher=OTHER); Thu, 15 Sep 2011 08:24:22 -0700 (PDT) Message-ID: <4E7218A4.4000205@my.gd> Date: Thu, 15 Sep 2011 17:24:20 +0200 From: Damien Fleuriot User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:6.0.2) Gecko/20110902 Thunderbird/6.0.2 MIME-Version: 1.0 To: "freebsd-stable@freebsd.org" References: <4E71C059.5060404@hi-media.com> In-Reply-To: <4E71C059.5060404@hi-media.com> X-Forwarded-Message-Id: <4E71C059.5060404@hi-media.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: CARP interfaces and mastership issue X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Sep 2011 15:50:19 -0000 Posting to -stable since -pf didn't show much interest :/ -------- Original Message -------- Subject: CARP interfaces and mastership issue Date: Thu, 15 Sep 2011 11:07:37 +0200 Hello list, TLDR: carp interface becomes MASTER for a split second after being created, even if another MASTER exists on the network with faster advertisements. Breaks connections. HOWTO prevent ? We've been experiencing this double mastership problem with CARP interfaces. Allow me to put some context here: 2 firewalls, PF1, PF2, each with 2 VLANs (for example, some have more) on a lagg device (link aggregation). These firewalls then share virtual IPs through CARP interfaces, let us assume the following: PF1: - vlan13 - vlan410 - carp13 (advskew 50) - carp410 (advskew 50) PF2: - vlan13 - vlan410 - carp13 (advskew 100) - carp410 (advskew 100) CARP preemption is turned on, so that if vlan13 should fail on PF1, PF2 would assume mastership on both CARP interfaces. Syscontrols below: net.inet.carp.allow: 1 net.inet.carp.preempt: 1 net.inet.carp.log: 1 net.inet.carp.arpbalance: 0 net.inet.carp.suppress_preempt: 0 The problem we have is, say for example we reboot PF2. When it comes back up, it will, even for a split second, assume CARP mastership for its interfaces, at the same time as PF1. This breaks existing sessions, openvpn tunnels and new client connections. While I acknowledge the home-made demons should be built to support tiny network outages, this doesn't solve our main problem. We have the same issue when destroying/creating said CARP interfaces. Recently we upgraded some switches' IOS version on our backup datacenter (which also has 2 PF boxes, sharing the CARP IPs with the 2 PFs on our production DC). To prevent anything nasty happening, we forbade production VLANs on the switches' uplink ports and only allowed management traffic to allow us to perform the upgrade. Things went smoothly but when we brought the production VLANs up again at layer 2 on the switches, when spanning-tree converged we had again a double MASTER problem. I understand I could have avoided it by destroying/recreating the CARP interfaces, but even in this case there is a split second during which both firewalls are CARP MASTER. Is there any way to force CARP to assume INIT state for some time when coming up, and only after X seconds either become MASTER or BACKUP ? Any other idea how to solve this, guys ?