Date: Wed, 8 Sep 1999 12:24:36 -0500 (CDT) From: Alec Kloss <alec@D2SI.COM> To: chris@tourneyland.com Cc: freebsd-questions@freebsd.org Subject: Re: Reverse DNS question Message-ID: <199909081724.MAA47927@D2SI.COM> In-Reply-To: <3.0.6.32.19990908113252.008181e0@mail.9netave.net> from "chris@tourneyland.com" at "Sep 8, 1999 11:32:52 am"
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chris@tourneyland.com said: > Hi, > > I've been reading a little about DNS, inlcuding about the responsibility a > DNS server it has for reverse DNS. For example, if I own the Class C > 111.72.34.* (which I don't), I'm responsible for the 111.72.34.IN-ADDR.ARPA > zone. Actually, it is 34.72.11.IN-ADDR.ARPA, but you get the idea. > Here's my problem: I have 5 static IP addresses, that my ISP leases me > along with my ADSL line. So, who's in charge of reverse DNS for those 5 > addreses? Unless I'm mistaken, the granularity of reverse DNS isn't such > that I can handle just my 5, and the ISP does the rest. Instead, I assume > that my ISP is responsible for reverse DNS on those 5, so it's up to me to > tell them what maps to what. This would also imply that I don't do any > reverse DNS at all (I'm not sure what this would mean for local reverse DNS > stuff, except that maybe it just gets forwarded like any other unknown DNS > request). > > Is this correct? Short answer, yes with an if. Long answer, no with a but. If you don't mind having to get your ISP to configure your reverse DNS stuff and having to get them to change it whenever you feel like it, you can let them take care of all the details and you can leave it all alone. But, if you want control over the reverse DNS on your addresses for whatever reason (you are curious about how to do it or you want to be able to change them without dealing with your ISP), you'll need to do it yourself. RFC2317 documents one way of doing this. (As I was glancing around the net, I found http://www.ripe.int/inaddr/infosources.html which seems to be helpful.) My ISP uses an alternative which uses IN NS records instead of the IN CNAME records. It seems to work pretty well. > - Chris > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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