我尝试设置仅 IPv6 的家庭局域网，但 DNS 似乎无法正常工作。要启用 NAT64，我必须将公共 DNS 服务器更改为我的防火墙（无论如何，这是首选选项）。我使用的是最新固件 7.4 的 Fortigate
它成功解析了 A 记录：
nslookup -type=A ip4only.me
Server: 2001:xxxx:xxxx:4c03::f
Address: 2001:xxxx:xxxx:4c03::f#53
Non-authoritative answer:
Name: ip4only.me
Address: 23.153.8.78
以及将 IPv4 响应转换为 IPv6 响应
nslookup -type=AAAA ip4only.me
Server: 2001:xxxx:xxxx:4c03::f
Address: 2001:xxxx:xxxx:4c03::f#53
Non-authoritative answer:
ip4only.me has AAAA address 64:ff9b::1799:84e
问题出在仅限 IPv6 的站点上，Fortigate 不会回复：
nslookup -type=AAAA ip6only.me
Server: 2001:xxxx:xxxx:4c03::f
Address: 2001:xxxx:xxxx:4c03::f#53
Non-authoritative answer:
*** Can't find ip6only.me: No answer
当然，公共 DNS 服务器可以解析这个查询：
nslookup -type=AAAA ip6only.me 2001:4860:4860::8888
Server: 2001:4860:4860::8888
Address: 2001:4860:4860::8888#53
Non-authoritative answer:
ip6only.me has AAAA address 2001:4810:0:3::78