How to configure nat port translation in a ZyXEL ADSL router
How to configure nat port translation in a ZyXEL 661 ADSL router
Problem
Configuring Port Mapping via web interface is not possible. Use telnet commands detailed below.
Solution
If you are having problems configuring port mapping on a Zyxel router, the below instructions should help you.
There is no way of doing this using the web GUI so please use the telnet command to configure port mapping.
You can only do port address translation via the command line interface (telnet):
Example 1: translate external ports 4420 through 4422 to internal ports 8080 through 8082 to internal lan
ip 192.168.26.101
:4420 -> 192.168.26.101:8080
:4421 -> 192.168.26.101:8081
:4422 -> 192.168.26.101:8082
ip nat server load 1
ip nat server edit 2 svrport 4420 4422
ip nat server edit 2 intport 8080 8082
ip nat server edit 2 forwardip 192.168.26.101
ip nat server edit 2 active yes
ip nat server save
To display the table :
ip nat server load 1
ip nat server disp 1
Example 2 : Translate external ports 8080 to internal ports 80 to internal lan ip 192.168.0.10
ip nat server load 1
ip nat server edit 2 svrport 8080 8080
ip nat server edit 2 intport 80 80
ip nat server edit 2 forwardip 192.168.0.10
ip nat server edit 2 active yes
ip nat server save
Change Default WebAdmin tcp port 80 to 81 as this will cause issue’s.
Enable WEB-Admin :
sys server load
sys server access http 0
sys server save
Change WEB-ADMIN port 80 to 81.
sys server load
sys server port web 81
sys server save
sys server: save ok
Notes: (1) The “load 1” is required to loading the set #1 (1st page) of rules,
the “edit 2” refers to the 2nd rule (in set #1)
(2) svrport refers to the ports as they appear on the WAN side before the translation
(3) intport refers to the ports as they appear on the LAN side after the translation
if you view the port forwarding rules in the web interface (Network > NAT) the external ports
(svrport) are shown in rule 1 (N-1)
If your firewall is enabled, then you will need to create a firewall rule based on the internal ports (intport).
Add WAN/LAN rule 1 Permit Source IP = any Destination IP = 192.168.0.10 Service = TCP Port 80
Display Listening Ports:
sys server disp
ip tcp status
ENABLE/DISABLE FIREWALL
P-660H-D1> sys firewall active no
P-660H-D1> sys firewall active yes