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you should find out on the DVR which ports it requires to go out. every brand is different. i worked with alot of brands.
i assume you are residential internet user, even if you are able to port forward and get it working, you probably have a dynamic IP address.
what that means is: after 'x' amount of time. (days. weeks. etc.) your IP will change and you will have to port forward all over again.
alot of modern cctv dvrs have a type of dns relay server. so you can give it a name and you dont have to worry about port forwarding. something like how teamviewer works?
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