ATTN GARY KLINE
smithi at nimnet.asn.au
Fri Nov 5 07:28:32 UTC 2010
In freebsd-questions Digest, Vol 335, Issue 8, Message: 29
On Fri, 05 Nov 2010 01:32:11 -0400 Jon Radel <jon at radel.com> wrote:
> On 11/5/10 12:22 AM, kline wrote:
> > It is time to get this stuff arrow-straight, so hoping that someone
> > on-list can clue me in.
> > http://www.dnscog.com/report/thought.org/1288928790
> If your parents, the nameservers authoritative for .org, tell the world
> that one of the nameservers for thought.org is ns1.thought.org, they
> also have to tell the world what the IP address for ns1.thought.org is
> using an A record. That A record is glue. Otherwise you get a machine
> conversation something like:
> Resolving nameserver trying to find a record in the thought.org zone
> (RN): Please Mr. root server, I'd like to know about www.thought.org....
> Root: See the .org folks over there....
> RN: Please Mr. top-level dude, about that www.thought.org....
> Org: Well, see ns1.thought.org....
> RN: Ahem, I'm trying to find out basic stuff about thought.org and I
> don't know the address for ns1.thought.org in order to ask it
> Org: Well, ask ns1.thought.org what the address for ns1.thought.org is...
> RN: But, but, but....followed by petulant stomping off
> Glue A records fix that problem.
Lovely description Jon :) But you don't always have any control of what
parent nameservers do; eg we do DNS for a .com but both NS are in .au so
DNS reports always whinge about lack of glue .. nonetheless it works,
though only after a hunt down through the .au servers, until cached.
> BTW, the fact that a glue record isn't returned for ns2.everydns.net in
> response to a query about NS records for thought.org really isn't a
> problem; note the "info" rather than "fail" from DNSCog.
> Biggest problem I still see is that ns2.everydns.net refuses to respond
> to queries about thought.org. You sure your account there is still
> active and functional and that you're allowing zone transfers to them?
Confirmed here, no response at all after a good long wait; worse than
reyrning 'we don't do thought.org'
% dig @ns2.everydns.net. thought.org
; <<>> DiG 9.3.4-P1 <<>> @ns2.everydns.net. thought.org
; (1 server found)
;; global options: printcmd
;; connection timed out; no servers could be reached
where they really should be quickly issuing a REFUSED response. 'dig
@ns2.everydns.net. everydns.net' works fine, so I'm reaching it ok.
> I note that you don't allow transfers from arbitrary addresses, and
> http://www.everydns.com/faq/secondary-domain/example-setup does warn
> that the source address for transfer requests was/will/did change.
> Some of the problems reported by DNSCog appear to be bogus. They've got
> some bugs related to cases where a nameserver has a name in the domain
> in question. (And also some bugs related to nameservers which are
> reachable by both ipv4 and ipv6, but that doesn't apply to you.)
Bogus indeed. Tested one local domain there and got whinging about not
accepting <> and postmaster@ mail; odd, thought I, but maillog shows:
Nov 4 22:43:43 xxxx sm-mta: ruleset=check_relay,
arg1=[18.104.22.168], arg2=22.214.171.124, relay=[126.96.36.199],
reject=550 5.7.1 Fix reverse DNS for 188.8.131.52
% dig -x 184.108.40.206
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 18278
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;220.127.116.11.in-addr.arpa. IN PTR
;; AUTHORITY SECTION:
46.146.216.in-addr.arpa. 1800 IN SOA ns1.mydyndns.org.
zone-admin.dyndns.com. 2008082768 10800 1800 604800 1800
Seems a bit amateurish to me, running a service like that on a dynamic
address without reverse resolution, then expecting mail to work ..
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