3 ms·
Those ISP resolver caches do respect the DNS TTL per the spec, otherwise all kinds of stuff breaks. If you're concerned that this would still be an issue you c
by fulafel 6y ago
Those ISP resolver caches do respect the DNS TTL per the spec, otherwise all kinds of stuff breaks.
If you're concerned that this would still be an issue you could easily do some measurements. There's no incentive for ISPs to break the this given the "my internet is broken" UX and how tiny DNS traffic is.