Hahaha yeah, thanks Residential ISPs, your DNS sucks. I always found a better caching resolver, like UUNET, until Verizon got better at it, and then Google DNS came along. The caches have cleared. Beckman On Thu, 20 Jan 2022, Alex Balashov wrote:
Why, back in my day, residential ISPs would ignore your TTLs and cache for 3 days no matter what you did?
Kids these days.
? Alex
On Jan 20, 2022, at 7:54 PM, Peter Beckman <beckman at angryox.com> wrote:
Please, y'all -- when doing a DNS migration, ensure 1000% that your DNS records on your old DNS provider match your DNS records on your new DNS provider, and plan your DNS migration early by setting the TTL for your NS records at least to 5 minutes (300 seconds) if allowed, 30 seconds if you can.
Assume all caching servers will cache for 5 minutes even if you set it to 30 seconds.
At least that way if things go wrong, your outage horizon is 5 minutes, not 1 hour or more!!!
-- Alex Balashov | Principal | Evariste Systems LLC
Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free) Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
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