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45

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.abc.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. 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.

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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Chapter 4: Configuration

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ADSL

Connect Mode:

The default is Multimode; it will detect the ADSL line code, G.dmt, G.lite,

and T1.413 automatically. But in some area, it cannot detect the ADSL line code well. At this

time, 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.

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Chapter 4: Configuration

47

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 drop-

down list, simply enter its IP address as shown above. Your ISP may provide an SNTP

server for you to use.

Resync Poll Interval

(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.

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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.

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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