[TriLUG] calling dns experts

[Aaron Joyner via TriLUG]

`dig +trace <domain>` is your friend.  It will walk down from the root
nameserver records, and attempt to resolve the record at each server along
the way.  If you're seeing inconsistent results, run it several times, or
step through each of the authoritative servers returned at each step, to
verify what each of them returns.  Note that the most likely outcome is
indeed that you'll just have to wait out the propagation delay and cache
timeouts.  Note that most server implementations also do negative caching,
meaning that if there was a brief period that the domain did not resolve,
they may cache that for up to the SOA minimum value (
https://tools.ietf.org/html/rfc2308 for the finer details).  You'll have to
wait out the negative cache TTL to be sure all the recursive resolvers will
return the correct results.

Good things come to those who wait,
Aaron S. Joyner

On Mon, Mar 8, 2021 at 11:24 AM Hariharan Gopalan via TriLUG <
trilug at trilug.org> wrote:

> I was watching the dig output, it keeps switching between resolved and
> unresolved, finally was able to talk to the tech guy supporting the .ai
> domain. This is a country domain for anguilla and he said it may take upto
> 5 hours to fully propagate.
>
> On Mon, Mar 8, 2021 at 11:04 AM Brian Bouterse <bmbouter at gmail.com> wrote:
>
> > Lookup the WHOIS record for which domain servers are authoritative on it.
> > Then use `dig` to inspect the results from those server. This should
> point
> > out where the gap is in the service currently.
> >
> > On Mon, Mar 8, 2021 at 10:55 AM Hariharan Gopalan via TriLUG <
> > trilug at trilug.org> wrote:
> >
> >> need some urgent help please, one of the domains I had registered with a
> >> registrar in latin america had expired. I renewed it and after an hour
> or
> >> so it started resolving. But soon after that it again stopped resolving,
> >> wondering why that would happen. any clues?
> >> --
> >> This message was sent to: bmbouter at gmail.com <bmbouter at gmail.com>
> >> To unsubscribe, send a blank message to trilug-leave at trilug.org from
> >> that address.
> >> TriLUG mailing list : https://www.trilug.org/mailman/listinfo/trilug
> >> Unsubscribe or edit options on the web  :
> >> https://www.trilug.org/mailman/options/trilug/bmbouter%40gmail.com
> >> Welcome to TriLUG: https://trilug.org/welcome
> >
> >
> >
> > --
> > Brian Bouterse
> >
> --
> This message was sent to: Aaron S. Joyner <aaron at joyner.ws>
> To unsubscribe, send a blank message to trilug-leave at trilug.org from that
> address.
> TriLUG mailing list : https://www.trilug.org/mailman/listinfo/trilug
> Unsubscribe or edit options on the web  :
> https://www.trilug.org/mailman/options/trilug/aaron%40joyner.ws
> Welcome to TriLUG: https://trilug.org/welcome