Hi Mark,

If I remember correctly, there could be a delay of up to 12h when you transfer between DNS... In fact, now after searching, I recall the reduction of TTL can make it a tad easier. Look here: https://chrisburge.net/blog/avoid-dns-propagation-delay-when-updating-dns

TTL will force clients to update the dns record, but it isn't going to change the speed at which the DNS to DNS communication works.

I really doubt that it would take anywhere near the 5 days, 48 or even 12 hours. Last I tampered with a live DNS, propagation took literary minutes (alright, maybe a few dozen minutes ;) )

Another way would be to split webserver to host "old" and "new" location, so as the new entry gets advertised, users are visiting the new instance and not the old.

Hope that helps,

Bart

pon., 14 mar 2022 o 18:58 Mark Rogers <mark@more-solutions.co.uk> napisał(a):

I figured someone here might be able to explain this to me better than
the ISP (or tell me they're wrong).

A lot of domain registrars provide DNS hosting, but often only after
the domain has transferred, and only after the DNS is set to use their
servers. This means there is a delay between (a) switching to the new
DNS and (b) adding the host records to it, resulting in potential
downtime for anything that relies on the DNS.

My question: If the time between (a) and (b) can be reduced to almost
zero (such as by making both changes in a single hit via an API), I
assumed that there'd (almost certainly) never be an incorrect DNS
response given and therefore no propagation delays should apply.
However the company in question told me that there would still be a
propagation delay but disappeared from the chat when I asked where.

Am I missing something, and if so what?

--
Mark Rogers // More Solutions Ltd (Peterborough Office) // 0344 251 1450
Registered in England (0456 0902) 21 Drakes Mews, Milton Keynes, MK8 0ER
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