ZyXEL Communications P-870HW-51a v2 User Manual

 Chapter 8 Network Address Translation (NAT)

P-870HW-51a v2 User’s Guide

In addition to the servers for specified services, NAT supports a default server IP 
address. A default server receives packets from ports that are not specified in the 
NAT Port Forwarding Setup screen.

Figure 56   NAT - DMZ Host 

External Start 
Port

Enter the original destination port for the packets.

To forward only one port, enter the port number again in the External 
End Port field. 

To forward a series of ports, enter the start port number here and the 
end port number in the External End Port field.

External End 
Port 

Enter the last port of the original destination port range. 

To forward only one port, enter the port number in the External Start 
Port field above and then enter it again in this field. 

To forward a series of ports, enter the last port number in a series that 
begins with the port number in the External Start Port field above.

Internal Start 
Port

Enter the port number here to which you want the ZyXEL Device to 
translate the incoming port. For a range of ports, enter the first number 
of the range to which you want the incoming ports translated.

Internal End 
Port 

Enter the last port of the translated port range.

Server IP 
Address

Enter the inside IP address of the virtual server here.

Protocol

Select the protocol supported by this virtual server. Choices are TCP, 
UDP, or TCP/UDP.

Back

Click Back to return to the previous screen.

Apply

Click Apply to save your changes back to the ZyXEL Device.

Cancel

Click Cancel to begin configuring this screen afresh.

Table 29   Port Forwarding Edit (continued)