From owner-freebsd-net@FreeBSD.ORG Thu Jul 2 18:34:18 2009 Return-Path: Delivered-To: freebsd-net@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id A6586106566C; Thu, 2 Jul 2009 18:34:18 +0000 (UTC) (envelope-from dwmalone@maths.tcd.ie) Received: from salmon.maths.tcd.ie (salmon.maths.tcd.ie [IPv6:2001:770:10:300::86e2:510b]) by mx1.freebsd.org (Postfix) with SMTP id D45C08FC12; Thu, 2 Jul 2009 18:34:17 +0000 (UTC) (envelope-from dwmalone@maths.tcd.ie) Received: from walton.maths.tcd.ie ([134.226.81.10] helo=walton.maths.tcd.ie) by salmon.maths.tcd.ie with SMTP id ; 2 Jul 2009 19:34:16 +0100 (BST) Received: from localhost ([127.0.0.1] helo=maths.tcd.ie) by walton.maths.tcd.ie with SMTP id ; 2 Jul 2009 19:34:15 +0100 (BST) To: Bruce Evans In-reply-to: Your message of "Fri, 03 Jul 2009 04:21:02 +1000." <20090703035833.E40558@delplex.bde.org> X-Request-Do: Date: Thu, 02 Jul 2009 19:34:15 +0100 From: David Malone Message-ID: <200907021934.aa77192@walton.maths.tcd.ie> Cc: Edwin Groothuis , freebsd-net@FreeBSD.org Subject: Re: NTP - default /etc/ntp.conf 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, 02 Jul 2009 18:34:18 -0000 > This is handled by having different local clocks in different strata. > I only use 2 such strata -- 1 for server and another for all clients. > But this is not so easy to set up as a default. Indeed - I use 14 for the server, in the hope that it would limit how far the unsynced time would get in the event of something unexpected happening. If we're disconnected, I don't expect the time to need to go more than two hops, so 14 should be OK. Introducing some machines at stratum 10 into my network will result in something else that I didn't expect. > ref8 FreeBSD cluster machines have the new ntp.conf, so they have the > local clock with the same stratum and this misconfiguration is getting > some official testing :-). I think this configuration has been pretty well tested, unbeknownst to many ;-) > It is probably actually unofficial, due > mergemaster blowing away the old primitive ntp.conf which is still > used on other FreeBSD cluster machines. This seems to break the > server config generally -- ntptrace on ref8* hangs after localhost > while ntptrace on ref7-amd64 hangs after hub. Interesting! David.