Foscam FI9818W User Manual page 34

Add cameras in WAN
If you want to view all cameras via the internet(remote computer), you will need to add them using DDNS
domain name. Firstly, make sure all of the cameras you added can be accessed through the internet.
(The way to configure DDNS is in chapter 4.4.4)
login to the first camera using a DDNS domain name and port.
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