本篇日志我查到关於居易的NAT及DMZ相关说明，
我用Goolge翻译播成中文再稍微调一下。

居易的NAT有「连接埠重定向」、「开放连接埠」和 「DMZ 主机」。
(There are Port Redirection, Open Ports, and DMZ Host.)

Port Redirection - The packet with the specified port number.is forwarded onto a specific LAN host  You can also translate the port to another local port. 
连接埠重定向 - 具有指定连接埠号的封包被转送到特定的 区网主机您也可以将该连接埠转换为另一个本地端连接埠。

Open Ports - It is the same as Port Redirection (described above) but allows you to define a range of ports. 
开放连接埠 - 它与连接埠重定向（如上所述）相同，但允许您定义一个范围的多个连接埠。

DMZ Host - This opens up a single host to the Internet completely. All incoming packets will be forwarded to the DMZ host, Except packets received in response to outgoing requests from other LAN host or incoming packets which match the rules of Port Redirection and Open Ports. 
DMZ 主机 - 这会将单个主机完全打开到 网际网络。所有传入的封包都将被转发到 DMZ 主机，但不包括反应来自其他 LAN 主机的传出请求及匹配的「连接埠重定向」和「开放连接埠」规则的传入封包。

When using combinations of these three methods, there is a priority structure Port Redirection >> Open Ports >> DMZ. For example, if an Open Ports rule conflicts with a Port Redirection rule, then Port Redirection will take effect. 

当使用这三种方法的组合时，有一个优先级结构「连接埠重定向」大於「开放连接埠」大於「DMZ主机」。 
例如，如果 Open Ports 规则与 Port Redirection 规则冲突，则 Port Redirection 将生效。