Date: Fri, 13 Jul 2007 11:56:28 -0700 From: Chuck Swiger <cswiger@mac.com> To: Dan Casey <dcasey@debtresolve.com> Cc: "freebsd-questions@FreeBSD. ORG" <freebsd-questions@freebsd.org> Subject: Re: is is able to setting up DNS server reverse lookup with DynamicIP? Message-ID: <246A0B0B-B20A-4673-875F-C27224248980@mac.com> In-Reply-To: <4697B9EB.5070907@debtresolve.com> References: <46970917.3030502@fpt.vn> <52742602-950D-4964-B9EA-6E0000A6F8D2@mac.com> <4697B9EB.5070907@debtresolve.com>
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On Jul 13, 2007, at 10:44 AM, Dan Casey wrote: >>> I'm using dynamicDNS, so I will able to specify the forward *AND* >>> reverse lookups? >> >> No. Reverse lookups are controlled by whoever owns the IP delegation >> for the netblock in question, and they are not going to configure PTR >> records for dynamic IPs. If you want to have reverse lookups you >> control, you'll need to get static IPs. > > Slight correction. To do what you want, you will need to get a static > ip. Then you can request your isp (or whoever owns the ip block) to > setup the PTR record for you. That's not really a correction. :-) If you get a single static IP, for example, normally the ISP or netblock owner will not delegate that, but are willing to setup a PTR record. If you get a larger static netblock, especially a /24 or larger, then your ISP can delegate reverse DNS to nameservers you run, and thus you can set up and change the reverse lookup results at will without needing your ISP to make PTR record changes. See http://www.ietf.org/ rfc/rfc2317.txt about "Classless IN-ADDR.ARPA delegation" for the deal with regard to delegation of smaller netblocks than a /24. -- -Chuck
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