From: Hauke Lampe Newsgroups: comp.protocols.dns.bind Subject: Re: about the A and PTR for sending mail Date: Thu, 10 Nov 2011 12:39:13 +0100 Lines: 53 Approved: bind-users@lists.isc.org Message-ID: References: NNTP-Posting-Host: lists.isc.org Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enigAA997A3E181B6F74676FAD3A" X-Trace: usenet.stanford.edu 1320925217 8043 149.20.64.75 (10 Nov 2011 11:40:17 GMT) X-Complaints-To: action@cs.stanford.edu To: bind-users@lists.isc.org Return-Path: X-Original-To: bind-users@lists.isc.org Delivered-To: bind-users@lists.isc.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=hauke-lampe.de; s=mail1; h=Content-Type:OpenPGP:In-Reply-To:References:Subject:To:MIME-Version:From:Date:Message-ID; bh=tUHo89enRKPfl0taU3f01NctXKiwN0s1Bc9cKrcoxoc=; b=rDZsldUI9GzBGQSuTsL8V0CSqRcy6ZNhsyDNAwYg2ggZ6LJA4KFTK2BzFmkHrgOVkwwbRAfxOL/gbkIk8vrB6cvlPC0QhxFax2r/r+yapLSym4u8Pf954XiKh3xPcsOZ2NF5vx3LUqXLt80VO4pKmfYTACtHBEOvTkMBT6P5FpO/NiHdweH9pqhV/pD8nZ/xCavR4zN8dnEInUdd74QMutE2eEBE7NdysEtERFAbu8QcBdTsmGr0Bc0C0r/biyXqLWfAMox38u1nJ9O9sAv5CiKH1diZlAcZ1PP4d/uKv6+B/7Ykx4mPUyhCZLhI9TOD0nqz6BekqDOXJgIlJWqixA==; User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.23) Gecko/20110922 Thunderbird/3.1.15 In-Reply-To: X-Enigmail-Version: 1.1.2 OpenPGP: id=2888001BD95F1C53; url=https://www.hauke-lampe.de/Hauke_Lampe_-_PGP_Key.txt X-Spam-Status: No, score=-2.0 required=5.0 tests=AWL,BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, NORMAL_HTTP_TO_IP autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mx.ams1.isc.org X-BeenThere: bind-users@lists.isc.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: BIND Users Mailing List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!news.franciliens.net!feed.ac-versailles.fr!porbandar.httrack.net!news.httrack.net!news.glorb.com!usenet.stanford.edu!not-for-mail Xref: x330-a1.tempe.blueboxinc.net comp.protocols.dns.bind:86 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigAA997A3E181B6F74676FAD3A Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 10.11.2011 02:57, =E9=A3=8E=E6=B2=B3 wrote: > I have two server IPs, the A records for them are: >=20 > mail.dnsbed.com. 300 IN A 74.117.233.4 > mail.dnsbed.com. 300 IN A 74.117.232.204 >=20 > The corresponding PTR records are: >=20 > 4.233.117.74.in-addr.arpa. 36466 IN PTR dnsbed.com. > 204.232.117.74.in-addr.arpa. 36453 IN PTR dnsbed.com. The forward lookup for dnsbed.com returns:; 173.245.61.41 173.245.61.115 The reverse entries for your nameserver don't have to match your mailserver name but they must be consistent, i.e. the reverse must resolve forward to the IP address. mail.dnsbed.com -> 74.117.233.4 -> dnsbed.com -> 74.117.233.4 would be a consistent reverse/forward loop. mail.dnsbed.com -> 74.117.233.4 -> dnsbed.com -> 173.245.61.41 is not Maybe the easiest way would be to change the PTRs of 4.233.117.74.in-addr.arpa. and 204.232.117.74.in-addr.arpa to "mail.dnsbed.com", so you don't have to move the A records of dnsbed.com HTH, Hauke. --------------enigAA997A3E181B6F74676FAD3A Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iEYEARECAAYFAk67t+wACgkQKIgAG9lfHFOkZQCgu7YU+BpOxytpNNtptOe88uMs q5sAoKKWTYdwooWzSPhL/7Obals4ABYa =zft8 -----END PGP SIGNATURE----- --------------enigAA997A3E181B6F74676FAD3A--