Quadrox QGuard Installation Manual - Manual (Page 29)

GuardNVR Installation Manual 29
Version 4.4 Series
Follow the prompts the Network connection wizard provides to define your unit in the
network.
For obtaining more detailed information about your network settings please contact
your system administrator or check the OS manual.
2.4.6.2 Router and firewall
To fully understand this section it is important to know what the difference between a router
and a firewall is.
A firewall is the piece of software that takes care of guarding the network communications.
Sometimes the term ‘firewall’ refers to the machine performing firewall tasks. This is
confusing and in fact incorrect: normally a firewall is not a piece of hardware, but a program
running on that hardware.
A router is a piece of hardware that embodies the physical connection between two different
networks (e.g. your local network and the Internet). It redirects (“routes”) data so that it arrives
at the correct place. A router is a hardware device, but its functionality is controlled by
software that runs on the router.
Sometimes the routing functionality is provided by a proxy server, bridge or gateway. While
these are not the same as routers, they can be considered as such for the discussion in this
document.
Router software can have firewall capabilities. In other words, the router software
can have, apart from its normal capability to connect two networks and redirect data,
the capabilities of inspecting, allowing, and denying certain network communication.
As an example, most broadband routers (ADSL, SDSL, cable modems, etc)
nowadays have firewall capabilities and are also being used as such.
In the following schemes the firewall and the router are depicted as two different
entities (nodes on the network), but know that they could be one and the same node
in practical cases.
2.4.6.2.1
Configuring router
The router that forms the connection between the corporate network and the Internet needs to
know which internal machine it has to send network traffic to.
For example, a client machine on the internet requests a connection on port 1518 (the port for
GuardNVR video commands), using the public IP address of the router. The router then needs
to know to which device on the corporate network it needs to send this connection request, in
this case the GuardNVR. So the router needs to know the local IP address on the corporate
network of the GuardNVR. Configurations for different brands and models of routers in the
field can be found in:
Web Resource for Router Configuration and Setup:
http://www.portforward.com/routers.htm