== DNS/negative-caching/TTL ==
[[DNS/TTL/negative-caching]]

Optimizing Negative Caching Time in DNS　
　https://securityblog.switch.ch/2016/05/02/optimizing-negative-caching-time-in-dns/
{{{
A lower negative caching time is more user-friendly
}}}

現在は900(15分)が適当だろう。

-- ToshinoriMaeno <<DateTime(2017-10-30T11:30:41+0900)>>