TP-Link TL-R860 User Manual page 59

Note:
Your opposite side should call your WAN IP, which is displayed on the "Status"
page.
4) How to enable DMZ Host: Login to the router, click the "Forwarding" menu on
the left of your browser, and click " DMZ" submenu. On the "DMZ" page, click
"Enable" radio and type your IP address into the "DMZ Host IP Address" field,
using 192.168.1.169 as an example, remember to click the "Save" button.
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: Login 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.
TL-R860
A-5 Add or Modify a Virtual server Entry
Figure A-6 DMZ
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Cable/DSL Router User Guide