Reverse lookups not working when Internet connection failed.

[Matus UHLAR - fantomas]

On 07.11.22 15:57, David Carvalho via bind-users wrote:
>Finally had the opportunity to get back to this.
>Having internet connection restored, everything seems to be working as supposed to. One simple query from my client and one response from my server.
>Output from wireshark:
>
>1	0.000000	10.0.0.199	193.136.66.1	DNS	85	Standard query 0x000b PTR 8.66.136.193.in-addr.arpa
>2	0.016660	193.136.66.1	10.0.0.199	DNS	204	Standard query response 0x000b PTR 8.66.136.193.in-addr.arpa CNAME 8.0-28.66.136.193.in-addr.arpa PTR meteo.di.ubi.pt NS dns.di.ubi.pt NS dns2.di.ubi.pt A 193.136.66.1 A 193.136.66.2
>
>Just 2 packets.

great, it works.

>But on the command line I get the following, and I'm confused why the "non-authoritive answer":

>Non-authoritative answer: -----------------------here!???
>8.66.136.193.in-addr.arpa       canonical name = 8.0-28.66.136.193.in-addr.arpa

this happens your server is not authoritative for the 
66.136.193.in-addr.arpa domain.

I guess your servers don't fetch 66.136.193.in-addr.arpa from your ISP.

I also wasn't able to reach your servers:

8.66.136.193.in-addr.arpa. 86400 IN     CNAME   8.0-28.66.136.193.in-addr.arpa.
0-28.66.136.193.in-addr.arpa. 86400 IN  NS      dns2.di.ubi.pt.
0-28.66.136.193.in-addr.arpa. 86400 IN  NS      dns.di.ubi.pt.
;; Received 121 bytes from 193.136.2.228#53(ns02.fccn.pt) in 56 ms

% dig -x 193.136.66.8 @dns.di.ubi.pt.
dig: couldn't get address for 'dns.di.ubi.pt.': failure

% dig -x 193.136.66.8 @dns2.di.ubi.pt.
dig: couldn't get address for 'dns2.di.ubi.pt.': failure

so there's another problem to solve.

>        IN      NS      dns.di.ubi.pt.
>        IN      NS      dns2.di.ubi.pt.

looks like your servers dns.di.ubi.pt (193.136.66.1) and dns2.di.ubi.pt 
(193.136.66.2) aren't reachable from internet.

-- 
Matus UHLAR - fantomas, uhlar at fantomas.sk ; http://www.fantomas.sk/
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