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I have CCTV that work via 3G (use simcard). I can access it directly using dynamic IP but as it keep changes, I won't be able to access it. My question if I set DDNS on CCTV, how can DDNS detect the current dynamic IP. Where do I port forward the DDNS host name as there is no router use. scenario like this

CCTV(3G simcard) ------> 3G provider ------> user <------ <------

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2 Answers 2

You need to make a port forwarding from the router ( located in 3G ISP ) and this is a challenge !

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Welcome to pro webmasters. For this to be a useful answer, please provide any additional information that could help people with this question such as instructions for enabling port forwarding or links to documentation about enabling port forwarding. –  Stephen Ostermiller Oct 9 '13 at 9:28
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The CCTV software that uses the 3G will need to support DDNS and from what you say that is the case. You now need a DDNS provider... personally I recommend DynDNS which offer some of the best DNS solutions that are reliable and not to expensive. I recommend the pro package which in their own short description sounds exactly what you need:

Looking to access your computer, DVR, webcam or camera system remotely without having to remember a confusing (and ever changing) IP address? Try DynDNS Pro, a great option for those who need Dynamic DNS and Remote Access capabilities without any bells, whistles or fireworks.

There are many other DDNS providers however and you should take a look here for free DDNS and other paid DDNS services. If the CCTV system is important I recommend a paid service as they have a habit of stop working on free based DDNS

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