Chapter 4:Configuration

52

DNS

A Domain Name System (DNS) contains a mapping table for domain name and IP addresses. On

the Internet, every host has a unique and user-friendly name (domain name) such as

www.helloworld.com and an IP address. An IP address is a 32-bit number in the form of

xxx.xxx.xxx.xxx

, for example 192.168.1.254. You can think of an IP address as a telephone

number for devices on the Internet, and the DNS will allow you to find the telephone number for

any particular domain name. As an IP Address is hard to remember, the DNS converts the friendly

name into its equivalent IP Address.

You can obtain a Domain Name System (DNS) IP address automatically if your ISP has provided it

when you logon, check the

Enable

box. Usually when you choose PPPoE or PPPoA as your WAN

- ISP protocol, the ISP will provide the DNS IP address automatically. You may leave the

configuration field blank.

Alternatively, your ISP may provide you with an IP address of their DNS. If this is the case, you

must enter the DNS IP address manually.

If you choose one of the other three protocols

─

RFC1483 Routed/Bridged and IPoA check with

your ISP, it may provide you with an IP address for their DNS server. You must enter the DNS IP

address if you set the DNS of your PC to the LAN IP address of this router.

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53

ADSL

Connect Mode:

The default setting is

Multimode

.

This mode will automatically detect your ADSL

line code, G.dmt, G.lite, and T1.413. But in some area, multimode cannot detect the ADSL line

code well. If it is the case, please adjust the ADSL line code to G.dmt or T1.413 first. If it still fails,

please try the other values such as ALCTL, ADI, etc.

Activate Line:

Aborting (false) your ADSL line and making it active (true) again for taking effect

with setting of

Connect Mode

.

Coding Gain:

Configure the ADSL coding gain from 0 dB to 7dB, or automatic.

Tx Attenuation:

Setting ADSL transmission gain, the value is between 0~12.

DSP FirmwareVersion:

Current ADSL line code firmware version.

Connected:

Display current ADSL line sync status.

Operational Mode:

Display current ADSL mode standard (Operational Mode) your Router is using

when ADSL line has sync.

Annex Type:

ADSL Annex A, which works over a standard telephone line. Annex B, which works

over an ISDN line.

Upstream:

Display current upstream rate of your ADSL line.

Downstream:

Display current downstream rate of your ADSL line.

Chapter 4:Configuration

54

System

There are six items within the

System

section:

Time Zone, Remote Access, Firmware Upgrade,

Backup/Restore, Restart

and

User Management.

Time Zone

The router does not have a real time clock on board; instead, it uses the Simple Network Time

Protocol (SNTP) to get the current time from an SNTP server outside your network. Choose your

local time zone, click

Enable

and click the

Apply

button. After a successful connection to the

Internet, the router will retrieve the correct local time from the SNTP server you have specified. If

you prefer to specify an SNTP server other than those in the list, simply enter its IP address as

shown above. Your ISP may provide an SNTP server for you to use.

Daylight Saving

is also known as

Summer Time Period.

Many places in the world

adapt it during

summer time to move one hour of daylight from morning to the evening in local standard time.

Check

Automatic

box to auto set your local time.

Resync Period

(in minutes) is the periodic interval the router will wait before it re-synchronizes the

router’s time with that of the specified SNTP server. In order to avoid unnecessarily increasing the

load on your specified SNTP server you should keep the poll interval as high as possible – at the

absolute minimum every few hours or even days.

Chapter 4:Configuration

55

Remote Access

To temporarily permit remote administration of the router (i.e. from outside your LAN), select a time

period the router will permit remote access for and click

Enable.

You may change other

configuration options for the web administration interface using

Device Management

options in

the

Advanced

section of the GUI.

If you wish to permanently enable remote access, choose a time period of 0 minutes. This setting

cannot be saved into flash when timer set to zero.

Chapter 4: Configuration

56

DO NOT power down the router or interrupt the firmware upgrading while it is

still in process.

Improper operation could damage the router.

Firmware Upgrade

Your router’s “firmware” is the software that allows it to operate and provides all its functionality.

Think of your router as a dedicated computer, and the firmware as the software it runs. Over time

this software may be improved and modified, and your router allows you to upgrade the software it

runs to take advantage of these changes.

Clicking on

Browse

will allow you to select the new firmware image file you have downloaded to

your PC. Once the correct file is selected, click Upgrade to update the firmware in your router.

Warning