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Figure 16:

The Status: Wireless Status Screen

The following table describes the labels in this screen.

Table 14:

The Status: Wireless Status Screen

Basic Overview

Wireless Status

This field displays

ON

when the CGN3’s 2.4 GHz

wireless network is active, and displays

OFF

when it is

inactive.

Wireless Mode

This displays the type of 2.4 GHz wireless network that

the CGN3 is using.

Wireless Channel

This displays the wireless channel on which the CGN3’s

2.4 GHz wireless network is transmitting and receiving.

5GHz Wireless Status

Wireless Status

(5GHz)

This field displays

ON

when the CGN3’s 5 GHz wireless

network is active, and displays

OFF

when it is inactive.

Wireless Mode

(5GHz)

This displays the type of 5 GHz wireless network that

the CGN3 is using.

Wireless Channel

(5GHz)

This displays the wireless channel on which the CGN3’s

5 GHz wireless network is transmitting and receiving.

SSID Overview

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(SSID)

This displays the 2.4 GHz wireless network’s Service

Set Identifier. This is the name of the wireless network,

to which wireless clients connect.

Broadcast SSID

This field displays

Enabled

when the 2.4 GHz wireless

network’s SSID is being broadcast, and displays

Disabled

when it is not.

WMM

This field displays

Enabled

when the 2.4 GHz wireless

network, and displays

Disabled

when it is not.

Security Mode

This displays the type of security the CGN3’s 2.4 GHz

wireless network is currently using.

Security Key

This displays the password for the CGN3’s 2.4 GHz

wireless network.

SSID Overview (5GHz)

(SSID)

This displays the 5 GHz wireless network’s Service Set

Identifier. This is the name of the wireless network, to

which wireless clients connect.

Broadcast SSID

This field displays

Enabled

when the 5 GHz wireless

network’s SSID is being broadcast, and displays

Disabled

when it is not.

WMM

This field displays

Enabled

when the 5 GHz wireless

network, and displays

Disabled

when it is not.

Security Mode

This displays the type of security the CGN3’s 5 GHz

wireless network is currently using.

Security Key

This displays the password for the CGN3’s 5 GHz

wireless network.

Table 14:

The Status: Wireless Status Screen (continued)

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4

Basic

This chapter describes the screens that display when you click

Basic

in the toolbar. It

contains the following sections:



Basic Overview

on page

48



The LAN Setup Screen

on page

51



The Port Forwarding Screen

on page

54



The Port Triggering Screen

on page

58



The DMZ Screen

on page

62



The DNS Screen

on page

62



The DDNS Screen

on page

63

4.1

Basic Overview

This section describes some of the concepts related to the

Basic

screens.

4.1.1

WAN and LAN

A Local Area Network (LAN) is a network of computers and other devices that usually

occupies a small physical area (a single building, for example). Your CGN3’s LAN

consists of all the computers and other networking devices connected to the

LAN 1

~

4

ports. This is your private network (in routing mode - see

Routing Mode

on page

38

).

The LAN is a separate network from the Wide Area Network (WAN). In the case of

the CGN3, the WAN refers to all computers and other devices available on the cable

connection.

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By default, computers on the WAN cannot identify individual computers on the LAN;

they can see only the CGN3. The CGN3 handles routing to and from individual

computers on the LAN.

4.1.2

LAN IP Addresses and Subnets

IP addresses on the LAN are controlled either by the CGN3’s built-in DHCP server

(see

LAN Settings

on page

28

), or by you (when you manually assign IP addresses to

your computers).

For more information about IP addresses and subnets in general, see

LAN Settings

on page

28

.

4.1.3

DNS and Domain Suffix

A domain is a location on a network, for instance

example.com

. On the Internet,

domain names are mapped to the IP addresses to which they should refer by the

Domain Name System. This allows you to enter “www.example.com” into your

browser and reach the correct place on the Internet even if the IP address of the

website’s server has changed.

Similarly, the CGN3 allows you to define a

Domain Suffix

to the LAN. When you

enter the domain suffix into your browser, you can reach the CGN3 no matter what IP

address it has on the LAN.

4.1.4

Debugging (Ping and Traceroute)

The CGN3 provides a couple of tools to allow you to perform network diagnostics on

the LAN:



Ping: this tool allows you to enter an IP address and see if a computer (or other

network device) responds with that address on the network. The name comes

from the pulse that submarine SONAR emits when scanning for underwater

objects, since the process is rather similar. You can use this tool to see if an IP

address is in use, or to discover if a device (whose IP address you know) is

working properly.



Traceroute: this tool allows you to see the route taken by data packets to get

from the CGN3 to the destination you specify. You can use this tool to solve

routing problems, or identify firewalls that may be blocking your access to a

computer or service.

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4.1.5

Port Forwarding

Port forwarding allows a computer on your LAN to receive specific communications

from the WAN. Typically, this is used to allow certain applications (such as gaming)

through the firewall, for a specific computer on the LAN. Port forwarding is also

commonly used for running a public HTTP server from a private network.

You can set up a port forwarding rule for each application for which you want to open

ports in the firewall. When the CGN3 receives incoming traffic from the WAN with a

destination port that matches a port forwarding rule, it forwards the traffic to the LAN

IP address and port number specified in the port forwarding rule.

NOTE:

For information on the ports you need to open for a particular application,

consult that application’s documentation.

4.1.6

Port Triggering

Port triggering is a means of automating port forwarding. The CGN3 scans outgoing

traffic (from the LAN to the WAN) to see if any of the traffic’s destination ports match

those specified in the port triggering rules you configure. If any of the ports match, the

CGN3 automatically opens the incoming ports specified in the rule, in anticipation of

incoming traffic.

4.1.7

DMZ

In networking, the De-Militarized Zone (DMZ) is a part of your LAN that has been

isolated from the rest of the LAN, and opened up to the WAN. The term comes from

the military designation for a piece of territory, usually located between two opposing

forces, that is isolated from both and occupied by neither.

4.1.8

DNS

Domain Name Server (DNS) runs special-purpose networking software, features a

public IP address, and contains a database of network names and addresses for

other Internet hosts. DNS translates Internet domain and host names to IP

addresses. DNS automatically converts the names we type in the Web browser

address bar to the IP addresses of Web servers hosting those sites.