Search Again: Re: Reverse DNS puzzle From: Men & Mice Support Date: Wednesday, November 10, 1999 Time: 2:04:00 am >...but of more >concern is that it reports there are no PTR records for our machines with A >records. I don't get this. I had quickDNS pro create a reverse domain for >our whole IP range. Yet when I use an online Reverse DNS lookup it fails to >complete the reverse lookup, but is able to complete the reverse lookup on >some of the ISP's machines in the same IP range. [...] >148.249.13.216.in-addr.arpa. PTR www.caravel.bc.ca. The problem is that your ISP has control of the reverse zone. The fact that you have created a reverse zone file doesn't mean that a resolver will query your server for your addresses. Reverse queries are resolved just like domain queries, starting at the root servers. The root servers delegate the class C subnet to your ISP: 249.13.216.in-addr.arpa. NS ns1.metronet.ca. 249.13.216.in-addr.arpa. NS ns2.metronet.ca. Your provider can't delegate this reverse zone to you, because it's delegated to them (and besides which, they have some addresses in this range as well). Right now, a query to ns1.metronet.ca for 216.13.249.148 gives no records found. You need to prod your ISP into resolving this. They have two possible solutions: 1) They can add PTR records for all of your addresses to their reverse zone file. If you ever add, remove, or rename a computer in your network, you'll need to have them change the reverse record. -- OR -- 2) They can delegate your part of the reverse zone using classless delegation (as described in RFC 2317 <http://www.faqs.org/rfcs/rfc2317.html>). This would give you direct control over your own reverse records. This type of delegation can be handled in a variety of ways; the most straightforward involves making a minor change to your existing reverse zone file. They would also have to create a number of records, but these records are very simple (and repetitive). If you or your ISP need any help understanding RFC 2317, just ask. ____________________________________________________________________ Chris Buxton cbuxton@menandmice.com Men & Mice http://www.menandmice.com Makers of: QuickDNS Pro

Messages In This Thread: Reverse DNS puzzle by Craig Bowers on Nov 10, 1999 at 1:28:00 am Re: Reverse DNS puzzle by Men & Mice Support on Nov 10, 1999 at 2:04:00 am Re: Reverse DNS puzzle by Craig Bowers on Nov 10, 1999 at 2:36:00 am