To:
dnsop@cafax.se
From:
Markus Stumpf <maex-lists-dns-ietf-dnsop@Space.Net>
Date:
Tue, 8 Apr 2003 15:38:14 +0200
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inline
In-Reply-To:
<Pine.LNX.4.44.0304071625170.19441-100000@commander.av8.net>; from dean@av8.com on Mon, Apr 07, 2003 at 04:30:05PM -0400
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Mutt/1.2.5.1i
Subject:
Re: I-D ACTION:draft-ietf-dnsop-inaddr-required-04.txt
On Mon, Apr 07, 2003 at 04:30:05PM -0400, Dean Anderson wrote: > > There is a much easier way to find out all the domains hosted by us than > > to ask for the PTR records of each and every IP of e.g. our /16. > > Really? What is it? Know your tools and ask your LIRs. > So, you expect everyone to give out their customer lists? Not every ISP > shares your hubris. That's not our fault. And if you mean that it's impossible, if I want Example Co Ltd as a customer, to find out where they have Internet connectivity from, just because you don't add reverse records, you're rather naive. Oh btw. the example I made is one customer, so adding one or 100 PTR records doesn't make much difference in matters of losing customers and it was the explicit wish of that customer to add the records. > > > Perhaps you want to rethink that long PTR list. And at > > > some point, it will be too big for a UDP reply. I hadn't even thought > > > about that until I looked at your big list. Then what? > > > > Then we don't add other names. > > If you don't add them, then their reverse is broken, according to this > proposal. 1) it isn't, according to this proposal 2) the software knows about reverse resolving first, as it gets the IP address, looks up the PTR and validates the info by doing a forward lookup of the name(s) it got from the PTR. If it doesn't get names in the PTR it will not lookup these names. 3) if UDP buffer is too small DNS software automatically switches to TCP (or at least it should). \Maex -- SpaceNet AG | Joseph-Dollinger-Bogen 14 | Fon: +49 (89) 32356-0 Research & Development | D-80807 Muenchen | Fax: +49 (89) 32356-299 "The security, stability and reliability of a computer system is reciprocally proportional to the amount of vacuity between the ears of the admin" #---------------------------------------------------------------------- # To unsubscribe, send a message to <dnsop-request@cafax.se>.