Panasonic BL-C210 Series Operating Instructions Manual page 97

So how can you access your camera when you are away from home if other people are using the same IP
address as your camera?
Understanding global addresses
The answer is to access the camera by entering the unique IP address assigned to you by your Internet Service
Provider (ISP). This address is called a global address, or a WAN (wide area network) address. In the example
below, your global IP address is aaa.aaa.aaa.aaa and your neighbor's global IP address is zzz.zzz.zzz.zzz.
•
Note that an actual IP address is made of numbers, not letters.
192.168.0.253
192.168.0.252
192.168.0.2
When you are away from home, you can access your router by entering aaa.aaa.aaa.aaa. But now you have
another problem—you don't want to access your router, you want to access the cameras connected to your
routers.
Understanding port numbers
Data is sent between devices on a network using different ports depending on what kind of data is being sent.
A port is not a physical object; it is a piece of information in the data that helps the data be directed to the
intended device. In the example below, the port numbers 50000 and 50001 are assigned to your cameras.
192.168.0.253
Port 50000
192.168.0.252
Port 50001
192.168.0.2
By assigning unique port numbers to your cameras, you can access your cameras when you are away from
home by entering aaa.aaa.aaa.aaa:50000 or aaa.aaa.aaa.aaa:50001 in the web browser of a PC. When your
router receives information via its global IP address, it passes it on to one of your cameras depending on which
port number you entered after the global IP address.
But how does your router know which camera to pass information to?
Understanding port forwarding
If your router supports a feature called port forwarding (sometimes it's called address translation, static IP
masquerade, virtual server, port mapping, or other names, depending on the router manufacturer), the router
can be set up to take information it receives on specific ports and pass it on to a specific IP address.
The port forwarding settings needed for the example above would look something like this:
B
192.168.0.1
aaa.aaa.aaa.aaa
C
B
192.168.0.1
C aaa.aaa.aaa.aaa
A
B
192.168.0.1
zzz.zzz.zzz.zzz
C
A
192.168.0.253
192.168.0.252
192.168.0.2
Operating Instructions 97