I've read through this a couple of times. Seems like you've got Apache
running on 126.96.36.199 (and presumably you know that it is in fact
visible to the world). The provider's reverse record points to
162-201-66-177.lightspeed.sntcca.sbcglobal.net. You run the DNS for the
zone, and you've got the address in question in there as www. You've also
usurped the zone 66.201.162.in-addr.arpa and configured it on that server.
The problem statement seems to be some variation of "when I do a reverse
lookup on 188.8.131.52 I get
162-201-66-177.lightspeed.sntcca.sbcglobal.net instead of www.bonsi.org".
The problem statement has the following variations:
1) Doing a DNS lookup with a DNS tool, e.g. dig.
2a) Doing name lookups during/access control.
2b) Where it's doing them.
I very assiduously stated "usurped" above. For starters, out of the /24
you only defined the record you're interested in. If you were
authoritative, you'd better expect complaints. ;-)
NOTE: This is a perfect use case for off-label use of RPZ, you could
define your PTR record in an RPZ and you wouldn't need to take over the
Fundamentally, you're not authoritative for the zone:
# dig 66.201.162.in-addr.arpa ns +short
You're not authoritative for bonsi.org either:
# dig bonsi.org soa +short
ns-cloud-b1.googledomains.com. cloud-dns-hostmaster.google.com. 55 21600
3600 259200 300
# dig bonsi.org soa ns +short
;; Warning, extra type option
If you want to get your definition, you need to refer to your server:
# dig @184.108.40.206 www.bonsi.org +short
dig @220.127.116.11 -x 18.104.22.168
; <<>> DiG 9.8.3-P1 <<>> @22.214.171.124 -x 126.96.36.199
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: REFUSED, id: 59075
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available
;; QUESTION SECTION:
;188.8.131.52.in-addr.arpa. IN PTR
;; Query time: 21 msec
;; SERVER: 184.108.40.206#53(220.127.116.11)
;; WHEN: Thu Aug 15 09:06:24 2019
;; MSG SIZE rcvd: 45
Oh drat that didn't work! What's the ground truth here? The ground truth
is that this isn't truly your server, it's Google's:
# dig -x 18.104.22.168 +short
Google isn't going to let you do that. For one thing, Google probably
knows they're not authoritative for the reverse zone (previously shown).
Now we're going to talk about running your own nameserver (like BIND)
because it's useful. I'm going to ignore the forward DNS for bonsi.org,
which is working. FTR, if you were running your own server (and committed
to managing it for use as an auth) you could request that the zone be
delegated there from .org.
The use cases we're concerned with here are having a local vanity zone,
and the unquestioned virtues of a local caching resolver. We are going to
assume that the caching resolver is not open to the world. You could even
run your bonsi.org authoritatively on the caching resolver but not
delegated, if you wanted to have stuff which resolved locally but wasn't
in the zone for world + dog (see previous note regarding RPZ).
I'm going to assume that your configuration for the reverse zone will
work, subject to the previous caveats regarding multiple PTR records,
ignoring completeness (see previous note regarding RPZ).
Assuming that you've got the reverse zone defined (in a DNS server which
will serve it) you can query it with "dig @<nameserver-address> ..."
(which we tried above and got REFUSED).
That's not particularly convenient. What you'd do is set this resolver as
the DNS for your subnet (either manually or via DHCP). Having done so,
zones which are authoritatively (or via RPZ) served from the caching
resolver will mask the properly delegated configuration.
If you configure your local caching resolver for the server running
Apache, then Apache will use it when resolving addresses to names, as it
is wont to do for access control and logging. This is also likely to be
faster than reaching out over the internet; it will also continue to work
if Google's DNS goes down for some reason.
Looks like you've got IPv6 too, we'll leave that for aother day.
We'll leave search lists and information leakage for another day.
On Wed, 14 Aug 2019, Eduardo Bonsi wrote:
bonsi.org hosted by Google Domain (In view external) zone;
NOTE: Multiple PTR records is allowed, but funny things will happen to
services restricted by FQDN when you do so. DAMHIK!
177 IN PTR ns1.bonsi.org.
177 IN PTR ns2.bonsi.org.
177 IN PTR ns3.bonsi.org.
177 IN PTR bonsi.org.
177 IN PTR www.bonsi.org.
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