See Resources for more details about the DNS requirements, including some caveats.

关于 DNS 需求的更多信息见 参考资料，其中包括一些附加说明。

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Then, check IP connectivity with the pingall script; it will tell you about the latency to your ISP's gateway, the DNS, and all your clients, including the problematic one.

然后使用 pingall 脚本检查这个 IP 是否有问题；这将告诉您有关到达 ISP 网关、DNS 和所有客户机的延时时间，其中包括那些有问题的客户机。

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By providing a root zone file, you can let your DNS server query the root Internet servers for information about other hosts on the Internet.

通过提供根区域文件，您可以让DNS服务器查询根internet服务器中关于Internet上的其他主机的信息。

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How about your DNS servers?

FORBES: The End Of IPv4 Is Near

The company currently handles about one million DNS requests a second, a number that spikes to around three million during moments of heavy Internet use.

FORBES: Verisign: Cyber Attacks Will Grow 1000-Fold This Decade

The method is known as DNS amplification, and is something that cyber security experts have known about for some time.

FORBES: 'Biggest Cyber Attack In History' Could Have Been Carried Out With Just A Laptop