From owner-freebsd-stable@FreeBSD.ORG Mon Sep 19 19:08:35 2005 Return-Path: X-Original-To: freebsd-stable@freebsd.org Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 2C96616A41F for ; Mon, 19 Sep 2005 19:08:35 +0000 (GMT) (envelope-from Colin.Farley@ecarecenters.com) Received: from ranger.electric.net (ranger.electric.net [216.129.90.29]) by mx1.FreeBSD.org (Postfix) with ESMTP id 84ABA43D45 for ; Mon, 19 Sep 2005 19:08:30 +0000 (GMT) (envelope-from Colin.Farley@ecarecenters.com) Received: from root by ranger.electric.net with emc1-ok (Exim 4.24) id 1EHR07-0002Pb-Th; Mon, 19 Sep 2005 12:08:27 -0700 Received: by emcmailer; Mon, Sep 19 2005 12:08:27 -0700 Received: from [64.4.68.42] (helo=wpg1-notesmail.PRLOANS.LAN) by ranger.electric.net with esmtp (Exim 4.24) id 1EHR03-0002M8-VQ; Mon, 19 Sep 2005 12:08:23 -0700 Importance: Normal X-Priority: 3 (Normal) From: Colin Farley To: matt@fruitsalad.org Date: Mon, 19 Sep 2005 14:08:22 -0500 Message-ID: X-Mailer: Lotus Domino Web Server Release 6.5.4 March 27, 2005 X-MIMETrack: Serialize by Notes Server on WebMail/COMPUBank(Release 6.5.4|March 27, 2005) at 09/19/2005 02:08:22 PM, Serialize complete at 09/19/2005 02:08:22 PM, Itemize by Notes Server on WebMail/COMPUBank(Release 6.5.4|March 27, 2005) at 09/19/2005 02:08:22 PM, Serialize by Router on PRLUSA-NOTESMAIL/COMPUBank(Release 6.5.3|September 14, 2004) at 09/19/2005 02:08:23 PM, Serialize complete at 09/19/2005 02:08:23 PM Content-Transfer-Encoding: quoted-printable X-Virus-Status: Scanned by VirusSMART (s) MIME-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: freebsd-stable@freebsd.org Subject: Re: Gratuitous ARP 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: Mon, 19 Sep 2005 19:08:35 -0000 Hi Matt, Thanks for your reply. = The model of the Cisco router is 2811. Do you think that lowering the= timeout to 5 seconds would be ok? I have seen that Cisco does not recommen= d a timeout below 30 seconds but after reading your reply and seeing as the= re are only a couple dozen hosts on this subnet I would think that thi= s would be fine. Please confirm. Thanks again. = Colin -----owner-freebsd-stable@freebsd= .org wrote: ----- To: freebsd-stable@freebsd.org From: Matt Douhan Sent by: owner-freebsd-stable@freebsd.org Date: 09/19= /2005 01:54PM cc: Colin Farley = Subject: Re: Gratuitous ARP On Monday 19 September 2005 19:31, Colin = Farley wrote: > 1.&nbs=3Dp; Set the arp cache timeou= t of the cisco router very low so > that outages a=3Dre = minimal. I would rather not do this as it will > p= roblably stress th=3De router too much. Unfortunately I know little> about cisco devices so=3DI really cant figure this one = out, does anyone > think that this is a bad th=3Ding? &n= bsp;Can you tell a cisco device not to > cache arp entri= es on just the=3Dinternal interface? The subnet > = currently consists of about 25 hosts =3Dso this may not be so bad after = > all? Depending on your Cisco router model you will= not have any issues whatsoever lowering the timeout to really low, in = the region of a few seconds. even an old 25xx device would be to han= dle that without problems. > > 2. Ru= n an ANT task to =3Dclear the cache on the cisco device, this > = ; task can become part of the UCARP=3Dscripts. This may be a go= od > solution but security is a concern. This wou= ld be very very bad, cause no matter how you do it the security concern= would be severe. -- Matt Douhan www.fruitsalad.org (remem= ber, amateurs built the Ark, professionals built the Titanic) =5F=5F=5F= =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F= 5F=5F=5F= =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F freebsd-stable= @freebsd.org mailing list [1]http://lists.freebsd.org/mailman/li= stinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stab= le-unsubscribe@freebsd.org" = References 1. 3D"http://lists.freebsd.org/mailman/li=