启用cloudflare免费服务

启动了IPV6支持

启动了DNSSEC

启动了TLS 1.3支持

;; ANSWER SECTION:
www.cnadn.net.          299     IN      AAAA    2606:4700:30::681b:9db1
www.cnadn.net.          299     IN      AAAA    2606:4700:30::681b:9cb1
www.cnadn.net.          299     IN      RRSIG   AAAA 13 3 300 20190607155152 20190605135152 34505 cnadn.net. 89UW6rToOQbECqe6Owayg7bdsajDf2dV/Bwpe/twJpX4+DzpLo/67wNL Vx1znrioz+xYS6fZTP3EQPbnP89TuA==

;; ANSWER SECTION:

www.cnadn.net. 299 IN AAAA 2606:4700:30::681b:9db1

www.cnadn.net. 299 IN AAAA 2606:4700:30::681b:9cb1

www.cnadn.net. 299 IN RRSIG AAAA 13 3 300 20190607155152 20190605135152 34505 cnadn.net. 89UW6rToOQbECqe6Owayg7bdsajDf2dV/Bwpe/twJpX4+DzpLo/67wNL Vx1znrioz+xYS6fZTP3EQPbnP89TuA==

由于是免费服务，所以没有中国节点加速，导致都从国外pop节点访问，TTFB有点大。。。。