Wireless N300 Home Router
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Note:
If you include port 80 on this section, you must set the port for
remote (web-based) management to a different number than 80, such as
8080, otherwise the virtual server feature may not take effect.
4.2 DMZ Host
The DMZ (De-Militarized Zone) function disables the firewall on the router
for one device for a special purpose service such as Internet gaming or
video conferencing. Enabling DMZ host may expose your local network to
potential attacks. So it is advisable to use it with caution.