Siemens S7-300 User Manual page 25

Input the IP address of the router in the IE browser address bar of the remote PC and then appear
the router setting interface, set the port mapping for PC, as shown below. If your PC does not use
the router to access Internet, then this step can be omitted.
The meaning of the above settings is that when the client ETH Adapter CN visit and access the
router's external network IP address of PC (this address is automatically resolved by the domain
name, you no longer cares about its change),router will automatically transfer this visiting to the
VCOMM virtual serial port software on the PC with IP address 192.168.1.108, port 8000
which is connected to the router
After setting, click "Restart Router" button or re-power the router to work with the new parameters.
Run the client software on the PC, as shown below, the domain name kollew.changeip.net has
been pointed to the external network IP address of the router.
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