Digi TransPort WR21 Handbook page 8

–
Now redirect incoming communications to this port by using the port forwarding rules. Go here in the WebUI:
Configuration-Network>IP Routing/Forwarding>IP Port Forwarding/Static NAT Mappings. Add the rule to
forward to the serial port as below.
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Ensure that NAT'ing is applied on both IP address and Port by going here: Configuration-
Network>Interfaces>Advanced>PPP 0. Make sure the IP Address and Port circle is checked under the Enable NAT
on this interface check box.
Meter Engineers Handbook for Cellular Communication 7