From owner-freebsd-questions@FreeBSD.ORG Wed Jul 19 14:29:04 2006 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id ED16316A4DA for ; Wed, 19 Jul 2006 14:29:04 +0000 (UTC) (envelope-from david.robillard@gmail.com) Received: from ug-out-1314.google.com (ug-out-1314.google.com [66.249.92.168]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1B2D843D53 for ; Wed, 19 Jul 2006 14:29:03 +0000 (GMT) (envelope-from david.robillard@gmail.com) Received: by ug-out-1314.google.com with SMTP id m2so337393uge for ; Wed, 19 Jul 2006 07:29:02 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:cc:mime-version:content-type:content-transfer-encoding:content-disposition; b=EzgkhVNAgyHP64HyBNKf7DB+X1IfeulbcY+m3mKGXLBBY5x48npyNMC199SAbo+fH0C9Tc+5vPEfpfZ/4Nb3l0x9LGDMNeTFRGbUexG9VL9Pv6eG69vSshnJrWMKjl+hxsR2QRtwLAv5S2O4/W7AyV54orJEZrIVy2g7hmljudk= Received: by 10.66.242.20 with SMTP id p20mr801563ugh; Wed, 19 Jul 2006 07:29:02 -0700 (PDT) Received: by 10.67.106.8 with HTTP; Wed, 19 Jul 2006 07:29:02 -0700 (PDT) Message-ID: <226ae0c60607190729n795082d6u9e990a9fb10163ff@mail.gmail.com> Date: Wed, 19 Jul 2006 10:29:02 -0400 From: "David Robillard" To: "Mikhail Goriachev" MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline Cc: FreeBSD Questions Mailing List Subject: Re: :::. Sendmail & WorkAroundBrokenAAAA. 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: Wed, 19 Jul 2006 14:29:05 -0000 > Thanks for looking into this. I just realised that the domain in > question got fixed overnight after notifying the sysadmin. I guess this > is a good thing, yet I'm left puzzled with the difference between > confBIND_OPTS option and compiled INET6 support. Hello Mikhail, The difference is rather simple. The sendmail program will look up AAAA records only if it is built with the NETINET6 compile-time macro defined. If so, it looks up AAAA records first, then A records. Thus, if sendmail is not compiled for IPv6, then the resolver will never query AAAA records. Hence there will never have a problem related to the WorkAroundBrokenAAAA. See 24.9.91 as "ResolverOptions" and 9.2.7 as "Broken IPv6 Name Servers" in the sendmail book by O'Reilly (the so called Bat Book ISBN: 1-56592-839-3) The book recommends the following if you find a broken Name Server: a) Notifiy the hostmaster running the broken name server. The sooner the broken name servers are fixed, the cleaner the internet will run. b) Add the define(`confBIND_OPTS', `+WorkAroundBrokenAAAA')dnl into your sendmail.mc file. Regards, David -- David Robillard UNIX systems administrator & Oracle DBA CISSP, RHCE, Sun Certified Security Administrator