In this article, I found the relevant instructions about Juyi's NAT and DMZ.
I used Google to translate it into Chinese and then adjusted it a little.

Juyi's NAT includes "port redirection", "open port" and "DMZ host".
(There are Port Redirection, Open Ports, and DMZ Host.)

< colgroup>

	Port Redirection  (Port Redirection)< /td>	Open Ports  (Open Ports)	DMZ Host  (DMZ Host)
Specify WAN Interface  (Specify Wan Interface)	Yes (Yes)	Yes (can)	Yes (can)
Specify Destination Port (designated destination port)	Yes  (Yes)	Yes  (Yes)	-
No. of Port Per Rule (number of ports per rule)	One (one)	Multiple (multiple)	Multiple (multiple )
Destination Port Translation (connection port translation)	Yes (Yes, for example, 33061 for a specific host on the external network 33063)	-	-
Priority (priority)	Highest (highest)		Lowest (lowest)

 

< p>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. 
Port Redirection - has The packets of the specified port number are forwarded to the specific LAN host. You can also convert the port to another local port.

 

Open Ports - It is the same as Port Redirection (described above) but allows you to define a range of ports. < br>Open Ports - This is the same as Port Redirection (described above), but allows you to define a range of multiple ports.

 

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 Host - This fully opens a single host to the Internet. All incoming packets will be forwarded to the DMZ host, except incoming packets responding to outgoing requests from other LAN hosts and matching "Port Redirect" and "Open Port" rules.

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. 

When using a combination of these three methods, there is a priority structure "Port Redirection" over "Open Port " is greater than "DMZ Host".  
For example, if an Open Ports rule conflicts with a Port Redirection rule, Port Redirection will take effect.