From owner-freebsd-net@FreeBSD.ORG Mon Oct 11 11:05:38 2010 Return-Path: Delivered-To: net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E408E10656C1 for ; Mon, 11 Oct 2010 11:05:38 +0000 (UTC) (envelope-from ume@mahoroba.org) Received: from mail.mahoroba.org (ent.mahoroba.org [IPv6:2001:2f0:104:8010::1]) by mx1.freebsd.org (Postfix) with ESMTP id 907268FC1C for ; Mon, 11 Oct 2010 11:05:38 +0000 (UTC) Received: from yuga.mahoroba.org (ume@yuga.mahoroba.org [IPv6:2001:2f0:104:8010:21b:d3ff:fe38:5381]) (user=ume mech=DIGEST-MD5 bits=0) by mail.mahoroba.org (8.14.4/8.14.4) with ESMTP/inet6 id o9BB5Ol6090656 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Mon, 11 Oct 2010 20:05:30 +0900 (JST) (envelope-from ume@mahoroba.org) Date: Mon, 11 Oct 2010 20:05:24 +0900 Message-ID: From: Hajimu UMEMOTO To: Eugene Grosbein In-Reply-To: <4CB2AF28.30309@rdtc.ru> References: <4CB2AF28.30309@rdtc.ru> User-Agent: xcite1.60> Wanderlust/2.15.9 (Almost Unreal) SEMI/1.14.6 (Maruoka) FLIM/1.14.9 (=?ISO-2022-JP-2?B?R29qGyQoRCtXGyhC?=) APEL/10.8 Emacs/23.2 (i386-portbld-freebsd8.1) MULE/6.0 (HANACHIRUSATO) X-Operating-System: FreeBSD 8.1-STABLE X-PGP-Key: http://www.imasy.or.jp/~ume/publickey.asc X-PGP-Fingerprint: 1F00 0B9E 2164 70FC 6DC5 BF5F 04E9 F086 BF90 71FE Organization: Internet Mutual Aid Society, YOKOHAMA MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset=US-ASCII X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.2.6 (mail.mahoroba.org [IPv6:2001:2f0:104:8010::1]); Mon, 11 Oct 2010 20:05:30 +0900 (JST) X-Virus-Scanned: clamav-milter 0.96.3 at asuka.mahoroba.org X-Virus-Status: Clean X-Spam-Status: No, score=-2.9 required=5.0 tests=ALL_TRUSTED,BAYES_00, T_RP_MATCHES_RCVD autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on asuka.mahoroba.org Cc: net@freebsd.org Subject: Re: strange resolver behavour 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: Mon, 11 Oct 2010 11:05:39 -0000 Hi, >>>>> On Mon, 11 Oct 2010 13:31:04 +0700 >>>>> Eugene Grosbein said: egrosbein> FreeBSD 8.1-STABLE: egrosbein> # host koin-nkz.com. egrosbein> koin-nkz.com has address 62.231.164.101 egrosbein> Host koin-nkz.com not found: 3(NXDOMAIN) egrosbein> This domain does not have MX records but NXDOMAIN seems to wrong return egrosbein> code to me. Think about MTA that does look-up for MX first, egrosbein> obtains NXDOMAIN and rejects mail. egrosbein> tcpdump shows that after MX look-up failure resolver adds my local egrosbein> domain suffix from /etc/resolv.conf's "search" clause and egrosbein> goes to my local DNS server looking for MX record for egrosbein> 'koin-nkz.com.my.ru.' that does not exists. Hence, NXDOMAIN. egrosbein> Is it a bug in our resolver? I think no, host(1) links ISC's resolver, and it doesn't use libc's resolver. I suspect there is some problem in host(1) or ISC's resolver. egrosbein> I've tested 6.4-STABLE and 7.3-STABLE, same effect. egrosbein> I've also tested 4.11-STABLE and it works correctly - no wrong egrosbein> suffix addition, no NXDOMAIN. 4.X's host(1) is from BIND8, but it comes from BIND9 on 5.X and later. I confirmed it on my 4.11 box with our in-tree host(1). However, host(1) from ports has same behavior with 8.1. It is bind9-9.3.6.1.1. % uname -r 4.11-RELEASE-p25 % /usr/bin/host koin-nkz.com. koin-nkz.com has address 62.231.164.101 % /usr/local/bin/host koin-nkz.com. koin-nkz.com has address 62.231.164.101 Host koin-nkz.com not found: 3(NXDOMAIN) Sincerely, -- Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan ume@mahoroba.org ume@{,jp.}FreeBSD.org http://www.imasy.org/~ume/