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6.5 Accessing Multiple Cameras over the Internet
When accessing multiple cameras over the Internet, you must assign separate port
numbers for each camera. The reason for this is simple. Your gateway router needs
some way of knowing which camera to direct an incoming request to. Unless directed
otherwise, your browser will always send web page requests to port 80. Since port 80
can only be forwarded to one LAN IP address, all incoming web page requests on port
80 will go to this address.
The solution to this problem is to set up the router, assign a different port number to each
camera. For example, you may set up your second camera to use port 81. When you want to
access this camera, you would tell your browser to use port 81, instead of port 80. In your
router’s port forwarding setup, you would need to forward port 81 to the LAN IP address of
the second camera. Web page requests arriving at port 81 will automatically be directed to
the second camera’s address.
To instruct your browser to use a different port, other than 80, to access a web page, you
would add the port number at the end of the IP address or URL, separated by a colon.
For example, to access a camera on port 81 if your WAN IP address is 211.75.91.24
, you
would enter http://211.75.91.24:81
into your browser’s address bar. You can do the same
thing with a URL such as http://tom.vipcam.cn:81.
The steps to set up remote access are as follows:
1. Go to your gateway router setup page and configure port forwarding to port 81 to
LAN IP address of Camera_1(e.g. 192.168.0.151) and port 82 to the LAN IP
address of Camera_2(e.g. 192.168.0.152).
2. From somewhere on the Internet, bring up Internet Explorer and enter your WAN
IP address followed by a colon and the port number such as:
http://211.75.91.24:81
to access Camera_1.
6.6 Dynamic Domain Name Service (DDNS)
Your Internet Service Provider (ISP) provides you at least one IP address which you use
to connect to the Internet. The address you get may be static, meaning it never changes,
or dynamic, meaning it’s likely to change periodically. Just how often it changes, depends
on your ISP. A dynamic IP address complicates remote access since you may not know
what your current WAN IP address is when you want to access your network over the
Internet. The solution to the dynamic IP address problem comes in the form of a dynamic
DNS service.
Note: Some routers use port 80 for remote configuration and it’s possible to
experience a conflict when using port 80 for camera access. Therefore, you
should use port 81 for your first camera, port 82 for the second, etc... This
setup also makes it easier to remember which camera is using a particular port
number.
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