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Port Mapping

Port mapping is the mapping of a port outside of the web

host’s IP address to a machine inside the web, to provide

service. When a user connects to the port of the IP address,

the server will automatically map the request to the

corresponding machine on the LAN.

With the port mapping function, many ports of one machine’s

IP address can be mapped to different machines and different

ports on the web. Port mapping can also have other special

functions, like POP, SMTP, TELNET, etc.

For example, if we want to map a web server which has an IP

address of 192.168.111.10, we just need to input the IP address

and TCP port 80 into the port mapping chart of the router.

There are two methods to map a port, automatic and manual.

The UPnP function automatically maps the port and modiﬁes

the router’s port mapping chart.

UPNP (Auto) Function

In order to get a connection to the DVR through a Public

network, we need to set the Router to cross the NAT of the

DVR. UPnP can make the NAT cross automatically via the

UPnP agreement of the DVR, and you don’t have to set up the

Router.

Note: To use the UPnP Function, there must be Router support

and be able to set up the UPnP Function.

1. Connect the Router to the network, access the Router’s

conﬁguration menus, set up the Router and

enable the UPnP Function.

Routers from different manufacturers may have some

differences, please refer to the speciﬁc router’s instructions

before setting it up.

2. Connect the DVR to the Router. The conﬁguration will

automatically connect to the IP address or static IP. After

setting up the IP address, click the Advanced Conﬁguration

and navigate to the menu with ports and multicast etc. Enable

“UPnP port mapping”

3. Enter the Router management interface. Detect the port

if there is already Port Mapping. If there is, it shows that the

UPnP set up is ﬁnished.

4. Input the IP address in a web browser such as Internet

Explorer, and add the port number of the DVR, for example:

155.157.12.227:81. If you want to enter by the Client Software,

use the TCP port offered by the outer network.

Note: If there are a few DVRs that need to be set up via the

UPnP function, in order to avoid IP conﬂict, set the ports of

the embedded DVR to different port numbers. Otherwise, it will

choose a previously set up DVR port as the ﬁrst choice.

Manual Port Mapping

1. Connect the DVR to a Router and set up a static IP address.

2. Log in to the Router, access its conﬁguration menu, and

enter the required settings. Then go to the port, set the IP

address distributed by the DVR, and set the rules for port

mapping, add the HTTP and TCP ports to the mapping list. The

default access ports of the DVR include HTTP port 80 and TCP

port 8000, if the ports are occupied by other devices; please

modify the default port of the DVR to other vacant ports.

3. Input the public net IP address into the web browser, and

add the port number of the DVR you want to access after the

IP, for example: http://155.157.12.227:81. If you want to access

it via Client Software, you can use the outer network TCP port

directly.

Notice: For detailed conﬁguration settings, please refer to the

your router user manual.

NTP Function

The NTP function handles time synchronization between the

DVR and the GPS clock server to ensure the accuracy of both

devices.

Internet Conﬁguration

CONFIGURATION→NETWORK, select “Advanced”, then select

“NTP” to conﬁgure. After accessing the Internet, the NTP

function can use a standard NTP server to automatically set the

time. Enter the IP address and domain name of an NTP server.

To activate the NTP function, click “Enable”.

You can select how often the DVR will update its clock setting.

The interval options are from 1 to 65535 minutes.

Intranet Conﬁguration

If the DVR is connected to an intranet, the user can use a

privately-owned server as the clock source. Enter the private

NTP server address in the DVR’s NTP conﬁguration (as noted

above) to set it as the clock source.

Privately-owned NTP servers can use standard NTP products

to provide accurate time setting from a PC system. Please refer

to the instructions below when using a PC system as an NTP

server.

NTP Server Set Up under Windows

“Start” menu→“Run”, input “regedit” to enter the registry

editing feature.

Build a new key assignment of DWORD Value by going to:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\

Services\W32Time\Parameters\registry sub key (NtpServer);

Change the value to 1, and save.

Restart the computer.

NOTE: changes to Windows registry must be done carefully

and only make the changes as noted above. It is best to always

make a backup of your registry before attempting any changes.

NTP Server Set Up Under Linux

Due to the differences between Linux distributions, for details

on how to set up an NTP server under Linux, refer to the

manual for the distribution you are using.

REMOTE ACCESS

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