firewall n extport locport t ip s

This command is used to setup the port forwarding configuration of the modem.

n = 1 to 50	Port forwarding number
extport = 0 to 65535	External port number to forward to
locport = 0 to 65535	Local port number to forward to
t = 0	Disable
t = 1	UDP
t = 2	TCP
t = 3	Both UDP and TCP
ip = 0.0.0.0 to 255.255.255.255	Local IP address to forward to
s = 0	Disable forwarding
s = 1	Enable forwarding

Notes:

Up to 50 port forwarding configurations can be set.
The local IP address will default to 192.168.1.X, where X is extracted from iii.iii.iii.iii and 192.168.1 is extracted from the IP address in the LAN Configuration setting.
LAN IP addresses used in port forwarding rules must match the LAN subnet as configured using lanip, lannetmask, and lanrepip.
The corresponding Port Forwarding Rules (PortFwd) page in the Web Interface only shows the first 10 port forwarding configurations.

Examples:

Set port forwarding #1 to forward data destined for port 8080 (same external & local port number), for both UDP and TCP, to IP 192.168.1.20 and enabled :
cmd firewall 1 8080 8080 3 192.168.1.20 1

Set port forwarding #2 to forward UDP data destined for external port 42375 and redirect it to local port 5001 at IP 192.168.1.20 and enabled :
cmd firewall 2 42375 5001 1 192.168.1.20 1