Security - Tenda W300D User Manual

Supposing that the router's WAN IP address is 183.37.227.201, then
the Internet user only needs to enter http：//183.37.227.201 in Web
browser address field to access your Web server.

4.2.8 Security

IP Filter
IP filter function can block LAN PCs from communicating with Internet
PCs by preventing specific IP addresses from accessing external
network through router via specific a port number or range.
1) Click "Advanced Setup" → "Security" → "IP Filtering" to display the
page above and then click the "Add" button to enter the page
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ADSL2/2+ Router