TP-Link TL-MR3420 User Manual page 99

4. I want to build a WEB Server on the LAN, what should I do?
1) Because the WEB Server port 80 will interfere with the WEB management port 80 on the
Router, you must change the WEB management port number to avoid interference.
2) To change the WEB management port number: Log in to the Router, click the "Security"
menu on the left of your browser, and click "Remote Management" submenu. On the
"Remote Management" page, type a port number except 80, such as 88, into the Web
Management Port field. Click Save and reboot the Router.

Note:
If the above configuration takes effect, to configure to the Router by typing
http://192.168.0.1:88 (the Router's LAN IP address: Web Management Port) in the address
field of the Web browser.
3) Log in to the Router, click the "Forwarding" menu on the left of your browser, and click the
"Virtual Servers" submenu. On the "Virtual Servers" page, click Add New..., then on the
"Add or Modify a Virtual Server" page, enter "80" into the blank next to the "Service
Port", and your IP address next to the "IP Address", assuming 192.168.0.188 for an
example, remember to Enable and Save.
TL-MR3420
Figure A-7 Basic Security
Figure A-8 Remote Management
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3G/4G Wireless N Router User Guide