求懂英语的帮帮忙，修改德国域名的NS为DNSPOD提供的。

因为注册费用便宜，所以在狗爹上面注册了个德国米，后来发现NS死活修改无效，问了客服。回复如下：

Are there nameserver requirements for my .de domain names?



Yes. The following nameserver requirements apply to all .de domain names:



You must have two authoritative nameservers. You can verify if your nameservers are authoritative by visiting http://www.denic.de/en/background/nast.html and entering the domain name and its nameservers to receive a reply. If the answer at ZoneCheck lists a non-authoritative answer at the top of the nameserver list, your nameservers are not authoritative. The nameservers in the domain name's zone file must match the nameservers you are trying to use, or your nameservers are considered non-authoritative.

Each nameserver must be on a separate class-C network. That is, the first three octets cannot be the same. For example, 216.1.69.1 and 68.42.99.120 are valid.

You must have a Start of Authority (SOA) refresh value between 10000 and 86400 seconds.

You must have a retry value between 1800 and 28800 seconds.

You must have a Time to Live (TTL) value between 180 and 345600.

You must specify a Mail Exchanger (MX) record that resolves to a valid mail server for the life of the domain name registration, not just for the registration itself.

Serial numbers for all nameserver zones for the domain name must match.

对我来说有点难度，懂英文的指点一二好吗，主要是考虑用CDN，现在制约很大，感谢了。