On Saturday, 28 December 2002 at 11:27:53 -0600, Len Conrad wrote: > >> Easier said than done. I've been assigned 66.45.116.136/29 by the ISP. > > .136 is not a power of 2 which is required for classless reverse > delegation.
They don't need to be powers of 2. > It should be .132/29 or .140/29 No, they're not powers of 2 either. The requirement for a /29 is that the last 3 bits of the binary representation be 0. Valid values in this area are 128, 136 and 144. >> I control DNS for quadtelecom.com, but I don't control the reverse >> lookup. I'd like to know the exact algorithm in use, so that I can >> negotiate with my ISP. > > For sub-Class C delegation, see the DNS & BIND book, 4th edition. > > <snip> I think the real problem here is that Harry's ISP is too clueless to handle reverse delegation. Another possibility is that they deliberately don't allocate a reverse address in order to stop him from sending mail directly; if they relay via their mail server (which appears to be mail.steelcityhosting.com, 66.45.117.3). For more information, take a look at the following, which is a message I send to systems which appear to be bona fide attempts from broken reverse addresses. Looking at the name of the sender, I'm sure this one is not bona fide, and I didn't really send the message. Most of my double bounces come from spammers. Greg -------------------- PLEASE READ THIS MESSAGE. It contains important information about problems at your site. It is machine generated, but it is intended to be intelligible. The attached message is caused by a misconfiguration of your DNS server: your mail server 65.60.8.2 claims to be localhost.localdomain, which does not resolve. As an anti-spam measure, we require reverse lookups for all mail we accept. This message will not be delivered unless you correct your DNS configuration. Since this situation has continued for a considerable period of time, we must assume that it is not a transient problem. If you believe this assessment is incorrect, or if you need help resolving the problem, please contact me by phone at +61-8-8388-8286 between 9 am and 6 pm Central Australian time (currently GMT+1030). ******************************************************************* [EMAIL PROTECTED], you have been copied on this message because we have reasonable grounds to believe that you are not aware of these problems, and that you have entrusted localdomain to deliver your mail for you. This message is an indication that localdomain is not perfoming this task correctly. If the situation continues, you should contact localdomain support and get them to rectify the problem. Greg Lehey > From [EMAIL PROTECTED] Thu Dec 26 15:50:55 2002 > Return-Path: <[EMAIL PROTECTED]> > Delivered-To: [EMAIL PROTECTED] > Received: by wantadilla.lemis.com (Postfix) > id CD3025194A; Thu, 26 Dec 2002 15:50:55 +1030 (CST) > Date: Thu, 26 Dec 2002 15:50:55 +1030 (CST) > From: [EMAIL PROTECTED] (Mail Delivery System) > To: [EMAIL PROTECTED] (Postmaster) > Subject: Postfix SMTP server: errors from unknown[65.60.8.2] > Message-Id: <[EMAIL PROTECTED]> > X-Spam-Status: No, hits=1.1 required=5.0 > tests=MAILER_DAEMON,MAILTO_TO_SPAM_ADDR,SPAM_PHRASE_00_01 > version=2.41 > X-Spam-Level: * > > Transcript of session follows. > > Out: 220 wantadilla.lemis.com ESMTP Postfix > In: HELO localhost.localdomain > Out: 250 wantadilla.lemis.com > In: MAIL FROM: <[EMAIL PROTECTED]> > Out: 250 Ok > In: RCPT TO: <[EMAIL PROTECTED]> > Out: 450 Client host rejected: cannot find your hostname, [65.60.8.2] > > Session aborted, reason: lost connection -- When replying to this message, please copy the original recipients. If you don't, I may ignore the reply or reply to the original recipients. For more information, see http://www.lemis.com/questions.html See complete headers for address and phone numbers To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-questions" in the body of the message
