The resolver Unbound has a handy feature 'prefetch' [1] which refreshes a cached record before it expires. I'm unfamiliar with Technitium though Edit: another

The resolver Unbound has a handy feature 'prefetch' [1] which refreshes a cached record before it expires. I'm unfamiliar with Technitium though Edit: another option allows for serving expired TTLs, which is permitted by rfc. There is a great explanation on their site [2] [1] https://unbound.docs.nlnetlabs.nl/en/latest/manpages/unbound.conf.html#unbound-conf-prefetch https://unbound.docs.nlnetlabs.nl/en/latest/manpages/unbound... [2] https://unbound.docs.nlnetlabs.nl/en/latest/topics/core/serve-stale.html https://unbound.docs.nlnetlabs.nl/en/latest/topics/core/serv...