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A comment on Akamai Edge DNS was down. Parent comment

Re:Akamai Edge DNS was down by dheera on Thursday July 22, 2021 @01:22PM (#27921707)
Is there a way to tell your system to fall back to the last known IP address if DNS server isn't reachable?

Basically soft-invalidate your local DNS cache but it back from the cache graveyard if DNS is down.

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Re:Akamai Edge DNS was down by elithrar on Thursday July 22, 2021 @02:00PM (#27922179)
You could run a local resolver like dnsmasq or Unbound that can “serve stale” on upstream failures, but that assumes the DNS failure is a client-facing resolver one.

From what I observed here, it was more internal DNS related: Newegg was serving an opaque “DNS failure” error page from Akamai’s front-end which is likely because their infra was failing to resolve names internally.

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Re:Akamai Edge DNS was down by TimWolla on Thursday July 22, 2021 @01:41PM (#27921916)
Unbound has a 'serve-expired' option: https://nlnetlabs.nl/documentation/unbound/unbound.conf/#ser...
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Re:Akamai Edge DNS was down by bombcar on Thursday July 22, 2021 @01:27PM (#27921752)
It should be possible to set your cache so it lives forever but still checks for a new IP at normal expiring time.
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