Date: Sun, 07 Sep 2008 15:14:32 -0500 From: Kevin Kinsey <kdk@daleco.biz> To: Andrew Falanga <af300wsm@gmail.com> Cc: freebsd-questions <freebsd-questions@freebsd.org> Subject: Re: mail server DNS configuration questions Message-ID: <48C43628.20207@daleco.biz> In-Reply-To: <200809062122.33714.af300wsm@gmail.com> References: <200809061928.28539.af300wsm@gmail.com> <48C3457C.6070301@daleco.biz> <200809062122.33714.af300wsm@gmail.com>
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Andrew Falanga wrote: >> *Not having* a reverse entry for a mail server is often >> the cause of issues. > > This I do know very well. I had similar problems when running a sendmail > backup spooler for Syracuse Networks back in 2000. The eventual solution was > that our ISP delegated control of our subnet to us. I'm wondering if > something similar must be done on the internal network, i.e. 192.168.2.0/24. > Perhaps I shouldn't have eluded to the problems that my clients are > experiencing. The real question is, should I configure a sub-domain under > whitneybaptist.org for this server and if so, how to set it up? > > I'm interested as to why you got this answer to the host query you did. In my > original mail, I provided the result of a reverse lookup on that IP address > to which I got this response: > [/usr/home/andy] > -> dig +short -x 72.24.34.252 > 34-252.72-24-cpe.cableone.net. > > Using host, on my machine, I get this response: > [/usr/home/andy] > -> host 72.24.34.252 > 252.34.24.72.in-addr.arpa domain name pointer 34-252.72-24-cpe.cableone.net. > Well, interestingly enough: [30] Sun 07.Sep.2008 DING! [kadmin@archangel][~/logs] host 72.24.34.252 252.34.24.72.in-addr.arpa domain name pointer 34-252.72-24-cpe.cableone.net. So something's changed in the last 12 hours, although I can't say exactly what. AFAIK, my DNS boxen and I were communicating Just Fine(tm) last night as well as this afternoon. > Regardless of the fact that I got a response and you didn't, I'm still not > getting the right information. The reverse mapping should be something like: > > 252.34.24.72.in-addr.arpa PTR mail.whitneybaptist.org. > > I may have gotten the syntax wrong as it's been a while since I've had to > manipulate BIND name tables. > >> And the RFC for ESMTP is #2821. >> > > Thanks for the RFC. > > Andy Well, at this point, I'd take the day off, and tomorrow perhaps have a "dig" at cableone's support ppl, looky here: [35] Sun 07.Sep.2008 14:03:43 [kadmin@archangel][~/logs] dig 72.24.34.1 ; <<>> DiG 9.4.2-P1 <<>> 72.24.34.1 ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 56668 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0 ;; QUESTION SECTION: ;72.24.34.1. IN A ;; AUTHORITY SECTION: . 3600 IN SOA A.ROOT-SERVERS.NET. NSTLD.VERISIGN-GRS.COM. 2008090700 1800 900 604800 86400 ;; Query time: 222 msec ;; SERVER: 66.76.92.18#53(66.76.92.18) ;; WHEN: Sun Sep 7 14:03:50 2008 ;; MSG SIZE rcvd: 103 So, it's obvious they're playing with this zone Right Now(tm), (more or less) as the SN seems to indicate today. Possible this is auto-generated or something, but I think you'll get no joy on the PTR records until they do something upstream. As for your internal net, I don't know much about it, unfortunately. KDK
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