ICP DAS USA GRP-520 User Manual page 44

(5) Set "DDNS" function. (Because the IP of 3G usually is not a fixed IP, we use DDNS to get
a fixed domain name)
(6) Set "Port Mapping Rule" to let user access the device behind GRP-520 via the internet.
This setting will bind the port of 3G interface to "Target IP:Target Port".
Port 12080 of 3G interface  192.168.0.20:80
Port 12180 of 3G interface  192.168.0.21:80
Port 12280 of 3G interface  192.168.0.22:80
(7) Please reboot GRP-520 to enable settings. (you can reboot from the web or the power
source)
GRP-520 User Manual, V1.30, Aug. 2015
44