4 ms·
Keep in mind that not all DNS caches—particularly those at large ISP's—respect sub-3600s TTL's. (they do this in an effort to reduce load; whether it is truly
by elithrar 14y ago
Keep in mind that not all DNS caches—particularly those at large ISP's—respect sub-3600s TTL's.
(they do this in an effort to reduce load; whether it is truly effective on today's hardware is arguable)
- saurik 14y agoSome ISPs (in particular, those in countries far from the US, such as those in the Middle East, although occasionally even Europe) do not even honor the hour-long TTL used by ELB (for reasons of latency, not load), so if you care about your traffic not being routed to someone else's server, you should not allow ELB to get exposed to end user requests (in my case, I use it to balance my backend servers, but the only incoming connections it handles are from CDNetworks, whom I know has a to-specification implementation of DNS caching).