Comment by pi-rat

I've had a lot of issues with this for some of our customers. Nobody wants to run old deploy environments for weeks..

Turns out their routers somehow sets an insane TTL (like max int), and reports this to their clients, which in turn also get stuck with an insane TTL. You have to reboot or flush both the router and the clients to get it unstuck. I don't know if it's a "feature" or some sort of memory corruption / race condition.

The routers were almost always Asus routers, ex: Asus RT66. And the same customers were repeat offenders (not every time, but often enough).

In the end we had them set DNS on their computers to something like 1.1.1.1