When it comes to TTL I try to imagine the perspective of the person on the other side that implemented the resolver at a university (which copies might be anywhere) or isp a couple decades ago. What odd behavior did they have to manage and what quick hacks might they have done to fix them?
From this I have chosen a minimum of 5 minutes of TTL. Anything that might have caused a large amount of dns traffic in the early day of the internet to go off every minute, or worse ever few seconds, might killed their server and taught the young programmer to sanitize inputs.
From this I have chosen a minimum of 5 minutes of TTL. Anything that might have caused a large amount of dns traffic in the early day of the internet to go off every minute, or worse ever few seconds, might killed their server and taught the young programmer to sanitize inputs.