shinwn

Nothing precludes you from upping the TTL after the change. Traditionally DNS admins progressively drop the TTL prior to a change to reduce the time an RRSet is in flux (so if your TTL is N, N + 1 seconds prior you drop it to half N, and again and again until its your preferred window size) and cautious ones slowly ramp back up again to the regular value.

DNS Push Notifications[1] could be tacked on to resolvers and clients.

1: https://tools.ietf.org/html/draft-ietf-dnssd-push

Is there anything like this that can act as gadget devices for more than one host? (So I can plug it in to 4 different PCs or the like)