DVRs, or digital video recorders, are network-enabled devices that stream live or recorded video from devices such as security cameras. Users can access their DVRs over the network or Internet. If the DVR is behind a router and not connected directly to the Internet, several issues can prevent users from connecting. The router's IP changes regularly, so users connecting to its IP address will have to be alerted to new IP addresses. DDNS solves this problem by giving the router a permanent address which it updates when its IP address changes. DMZ allows connections to the DVR through the router, by forwarding all ports from the router to the DVR.
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Connect the DVR to the router using a standard Ethernet cable or by joining its wireless network. See your DVR's documentation for information on joining a wireless network.
Access your DVR's status screen, look for its network status and write the IP address down. See your DVR's documentation for information on finding status details.
Open the router's Web configuration page by typing "192.168.0.1" into your Web browser's address bar and pressing "Enter." If this IP address doesn't work, see your router's documentation for its default IP address.
Log in with the router's username and password. Try an empty username and "admin" as the password, or "admin" as the username and an empty password. If none of these work, consult your router's documentation for its default username and password.
Locate and click the "DDNS" or "Dynamic DDNS" link on the router's "Tools" or "Advanced" menu.
Fill out the router's DDNS page, providing your DDNS service, host name in the form "address.sample-ddns.com" and your DDNS account username and password. If you don't already have a DDNS account, select any DDNS service on the router's DNS page, type its Web address displayed on the router's configuration page into your Web browser's address bar, press "Enter" and set up an account on its website.
Click the "Apply" or "Save Changes" button.
Locate and click the "DMZ" or "Demilitarized Zone" link on the router's "Applications & Gaming," "Firewall" or "Advanced" menu.
Click the "Enabled" button or check box.
Type the DVR's IP address into the "IP Address" box on the DMZ page.
Click "Apply" or "Save Changes."
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