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6.6 Router & Port Forwarding
A majority of networks will often consist of a single IP address which shares internet access
through a router. This IP address may be any external (public) static IP address or any
dynamic IP address issued by the Internet Service Provider.
The purpose of a router is to enable multiple personal computers and any other devices that
require internet connection to access the internet simultaneously. Most routers by default
enable (open) commonly used ports so that mainstream applications such as Hypertext
Transfer Protocol (HTTP, Port 80), File Transfer Protocol (FTP, Port 21), Telnet (Port 23) and
Post Office Protocol 3 (POP3, Port 110) are used.
To solve the firewall problem, and let a visitor into the network, the user instructs the router to
allow traffic to pass through on a given port. This is known as Port Forwarding, as the router
forwards (directs) all internet requests on a specific port to the local machine. With port
forwarding, external visitors are able to connect to the NVR while other internal devices
remain protected.
Here is the example of NVR connection.
Network
Router
use
Static IP
x
use
DHCP
x
PC Connect position
NVR IP Setting
A
○
STATIC
○
DHCP
○
STATIC
DHCP
○
STATIC
○
DHCP
STATIC
DHCP
PC Connect position
① LAN
② WAN
B
C
B
△
Ｘ
★
▲
Ｘ
☆
○
○
○
△
Ｘ
★
△
Ｘ
★
△
61
CF
C
★
Check the NVR IP of info
★
and set into Router.
○
N/A [Need Local DHCP
Server]
★
Check the NVR IP of info
★
and set into Router
N/A
△
PPPOE is not supported
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