Date: Thu, 24 Jul 97 16:43:00 -0800 From: "Studded" <Studded@dal.net> To: "freebsd-isp@freebsd.org" <freebsd-isp@freebsd.org> Subject: Importance of DNS reverse resolution Message-ID: <199707242343.QAA26405@mail.san.rr.com>
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On Thu, 24 Jul 1997 00:37:59 -0400, Gary Palmer wrote: >spork wrote in message ID ><Pine.BSF.3.95q.970724003016.14460A-100000@super-g.inch.com>: >> processes the logs. We've since gotten some positive responses from >> clients coming in from ISPs that don't do revs on most of their dialup >> connections. > >Thats broken. A number of ftp sites won't let you on without a valid >DNS entry for both A and PTR records. I'd ask my ISP to fix their DNS >if they weren't giving reverses. It's just plain stupid. If IRC is important to your customers, you should know that on many networks (EFnet for instance) most servers won't let a person on if they don't reverse (partially as a protection from spoofing). On DALnet we are a little more liberal, in the sense that we allow the clients on but they show up with an IP address instead of the hostname. In the future, this may change though, and of course, reverse mapping is generally a good policy anyway. :) On a related note, it may be of interest that approximately 10% of the users that connect to us either don't have hostnames, or have names that don't resolve. I know that some of them are intentional, in fact I've contacted some sites who've told me explicitly that they don't resolve their user's hostnames to discourage them from using IRC. And I'll spare you the humorous responses I get from ISP's that I contact regarding misconfigured DNS entries, although my favorite was the one that tried to convince me that there was a GOOD REASON for the A and PTR records for the hostname of their shell server to be mismatched.... *Grin* The man who fears nothing, loves nothing.
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