Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Tue, 20 Feb 2001 18:46:12 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Tue, 20 Feb 2001 18:46:03 -0500 Received: from code.and.org ([63.113.167.33]:972 "EHLO mail.and.org") by vger.kernel.org with ESMTP id ; Tue, 20 Feb 2001 18:45:47 -0500 To: hps@tanstaafl.de Cc: linux-kernel@vger.kernel.org Subject: Re: DNS goofups galore... In-Reply-To: <95ulrk$aik$1@forge.intermeta.de> <96c39t$o1g$1@forge.intermeta.de> From: James Antill Content-Type: text/plain; charset=US-ASCII Date: 20 Feb 2001 18:45:21 -0500 In-Reply-To: "Henning P. Schmiedehausen"'s message of "Tue, 13 Feb 2001 19:52:29 +0000 (UTC)" Message-ID: Lines: 67 User-Agent: Gnus/5.0807 (Gnus v5.8.7) XEmacs/21.1 (Capitol Reef) MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org "Henning P. Schmiedehausen" writes: > james@and.org (James Antill) writes: > > >"Henning P. Schmiedehausen" writes: > > >> % telnet mail.bar.org smtp > >> 220 mail.foo.org ESMTP ready > >> ^^^^^^^^^^^^ > >> > >> This kills loop detection. Yes, it is done this way =%-) and it breaks > >> if done wrong. > > > This is humour, yeh ? > > No. This was a comment on the "loop detection" claim. [snip ... domain example] > No. This is a misconfiguration. Yes, RFC821 is a bit rusty but as far > as I know, nothing has superseded it yet. And Section 3.7 states > clearly: > > Whenever domain names are used in SMTP only the official names are > used, the use of nicknames or aliases is not allowed. _In_ SMTP, that doesn't say anything about MX records to me and even if it does it's very old and needs to change. > And the 220 Message is defined as > > 220 So... you should have the reverse for the ip address after the 220. Which most people do (but not all, mainly due to there not being enough ips). [snip CNAME lesson] The question was, why can't you use CNAMEs. You said 'because of loop detection'. I said 'But that doesn't work anyway, because you can have to names pointing at one machine without a CNAME record ... and that needs to, and currently does, work'. > Dipl.-Inf. (Univ.) Henning P. Schmiedehausen -- Geschaeftsfuehrer > INTERMETA - Gesellschaft fuer Mehrwertdienste mbH hps@intermeta.de Let me put it this way... tanstaafl.de. IN MX 50 mail.hometree.net. tanstaafl.de. IN MX 10 mail.intermeta.de. intermeta.de. IN MX 50 mail.hometree.net. intermeta.de. IN MX 10 mail.intermeta.de. mail.hometree.net. IN A 194.231.17.49 mail.intermeta.de. IN A 212.34.181.3 49.17.231.194.in-addr.arpa. IN PTR limes.hometree.net. 3.181.34.212.in-addr.arpa. IN PTR babsi.intermeta.de. -- # James Antill -- james@and.org :0: * ^From: .*james@and\.org /dev/null - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/