From owner-freebsd-isp Fri Sep 29 7: 2:42 2000
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Date: Fri, 29 Sep 2000 10:01:38 -0400
From: Jan Knepper <jan@smartsoft.cc>
Organization: Smartsoft, LLC
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To: Jim Weeks <jim@siteplus.net>
Cc: Artem Koutchine <matrix@ipform.ru>,
Andy Wolf <Andy.Wolf@nextra.de>, James Wyatt <jwyatt@rwsystems.net>,
Jan Knepper <jan@digitaldaemon.com>, freebsd-questions@FreeBSD.ORG,
freebsd-isp@FreeBSD.ORG
Subject: Re: DNS: having domain1.com and domain1.net point to the same IP.
References: <Pine.BSF.4.21.0009290850070.335-100000@veager.siteplus.net>
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Jim Weeks wrote:
> On Fri, 29 Sep 2000, Artem Koutchine wrote:
>
> > From: "Jim Weeks" <jim@siteplus.net>
> > >
> > > On Fri, 29 Sep 2000, Andy Wolf wrote:
> > >
> > > > We use two A records now and therefor accept redundancy. The reverse
> > lookup
> > > > of course can only point to one of the labels.
> > >
> > > The general consensus throughout the industry seems to be that C names are
> > > evil.
> > >
> > > I have never been bitten by just using A names.
> > >
> >
> > I have. Revers lookup might fail and some secure smtp server and other
> > daemons
> > do not allow access if reverse lookup failes. For example:
>
> What type of smtp setup would fail because the reverse lookup name did not
> match that of the virtual domain?
>
> Do you have an example of a daemon that would choke?
No an example of a daemon that would choke, but UUnet didn't have my reverse-DNS
setup so the reverse lookup's didn't work.
For that reason I resend (this) messages, because I didn't see it appear on the
list.
Appearantly SMTP (as postfix) checks via a reverse lookup whether or not a host
really exists. When it does not, it does not accept the message.
Don't worry, be Kneppie!
Jan
--
Jan Knepper
Smartsoft, LLC
88 Petersburg Road
Petersburg, NJ 08270
U.S.A.
http://www.smartsoft.cc/
http://www.mp3.com/pianoprincess
Phone : 609-628-4260
FAX : 609-628-1267
FAX : 303-845-6415 http://www.fax4free.com/
Phone : 020-873-3837 http://www.xoip.nl/ (Dutch)
FAX : 020-873-3837 http://www.xoip.nl/ (Dutch)
In God we Trust -- all others must submit an X.509 certificate.
-- Charles Forsythe <forsythe@alum.mit.edu>
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