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LAN & WLAN
Case Studies
Configuration of ADSL routers
Original Polish version by Lukasz Sawicki
ADSL service (Asymmetric Digital Subscriber Line) is one of the most popular ways of getting Internet access, especially in the case of home users. To share the service among several computers one needs a router integrated with ADSL modem, which is connected directly to the telephone line (RJ11).
Typically, the ISP provides the user with basic ADSL modem which is suitable only for cooperation with a single PC.
Buying his/her own router the user can connect a number of home computers and optionally use wireless connectivity. The router may have additional functions that will be useful for optimum performance of the network.
Access Point TP-Link TL-WA701ND (2.4GHz, 802.11n, 150Mb/s) Wireless USB Adapter: TP-Link TL-WN721N (802.11n, 150Mb/s)
A typical network used in one-family home

Annex A or B? The home user should first get informed what kind of line is provided or available. In the case of common telephone lines (POTS/PSTN), there will be needed a router with Annex A. We recommend TP-Link devices: TD-8840 N2905, or TD-W8910G N2901 - router integrated with Access Point. For digital lines (ISDN) - the user has to employ a router with Annex B, such as TD-8840B N2906.
Example configuration of TP-Link TD-W8910G
for ADSL service (Annex A)
TP-Link TD-W8910G has been designed for ADSL service like Neostrada+
To begin the configuration connect the computer to any of the LAN ports in the router. It is also possible to use wireless connection, but the restart of the device will take more time.
The NIC adapter in the PC should use the same address pool that is set in the router.
The procedure:
  • Enter Start >> Settings >> Network and Dial-up Connections >> Local Area Connection >> Internet Protocol (TCP/IP) Properties (START menu in Windows OS);
  • Select: Obtain DNS server address automatically;
  • If the NIC didn't get IP address automatically, it is indispensable to enter the address manually, from the pool 192.168.1.2 ~ 192.168.1.254 (after configuring the router it is recommended to restore the automatic option).
Example of assigning the TCP/IP address (if automatic option does not work). At this stage other information is not needed.
After getting or entering the address use Internet browser to enter IP address of the router (the default one is 192.168.1.1). Then log in (the user name and password are given in user manual) and start the configuration procedure.
Login window
The service will be available only if all parameters are assigned correctly, for example according to the following table (ADSL services available in Poland). The service subscriber can always get proper configuration parameters from the ISP.
The easiest way to configure the router is to choose "Quick Setup" option.
ADSL Annex A
(The infrastructure of Telekomunikacja Polska S.A.)

Operator (ISP)

Service

Encapsulation

VPI

VCI

Multiplexing

TPSA

Neostrada

PPPoA

0

35

VC/MUX

GTS Energis

Multimo

PPPoE

0

35

LLC

Netia

Net24

PPPoA

0

35

VC/MUX

Dialog

DialNet

PPPoE

0

35

LLC

Tele2

Tele2

PPPoE

0

35

LLC

Parameters needed for proper configuration of ADSL service provided by other popular operators (Annex A)
Parameters of ADSL Annex B
(Dialog and Netia operators)

Operator (ISP)

Service

Encapsulation

VPI

VCI

Multiplexing

Netia

Net24

RFC2516 PPPoE

8

35

LLC

Dialog

DialNet

RFC1483 Bridge

1

32

LLC

Parameters needed for proper configuration of ADSL service provided by other popular operators (Annex B)
Begin with VPI/VCI paramters. They are responsible for connection and channel identification. E.g. for Neostrada+ it is 0/35 adequately (like the default ones). Then click Next.
ATM window (VPI and VCI)
The next step is configuration of connection type (for Neostrada+: PPPoA and VC/MUX.
Configuration of connection type
Then enter user name and password. For the first time, these are the default strings given in the table below (for the specific services). It allows to register the service after configuring the router, and obtain a unique user name and password.
Sometimes these parameters are provided separately (e.g. as a part of the contract - it depends on the ISP), together with other user's manual. However, in most cases after configuring the router the user should connect a dedicated website (apparently the only one available), and follow the instructions.
User name and password for the first connection and registration

Operator (ISP)

Service

User name

Password

TPSA

Neostrada

rejestracja@neostrada.pl

rejestracja

GTS Energis

Multimo

start@gtsenergis.pl

start

Netia

Net24

Internet

Internet

Dialog

DialNet

lack of data

lack of data

Tele2

Tele2

lack of data

lack of data

User name and password for the first connection and registration

Remarks on some items below:
  • Authentication Method (default: AUTO)
  • MTU - depends on ISP (default: 1492)
  • Dial on demand - it should be switched off.
Login window
Next, confirm Service Name, and, preferably, switch off Multicast function. Improper WAN Service parameter can block Internet access.

WAN window
Device Setup allows to configure LAN, including IP of the device (being the gateway of the network) and subnet mask. It also enables the user to switch on/off DHCP server. Use of DHCP server is a convenient option that automatically enables the computers in the network to obtain such parameters like IP address, subnet mask, default gateway, DNS servers.

LAN window
The last step is WLAN setup:
To use Access Point it is needed to:
  • select operating channel (it can be changed in the Wireless >> Basic window),
  • set SSID,
  • choose region (it can be changed in the Wireless >> Basic window),
  • set security options (it can be changed in the Wireless >> Security window).

Access Point setup screen
Before final approval Quick Setup provides a table with main WAN parameters. If they correspond to ISP data, click Save/Reboot. The configuration will be saved, and restored after each restart of the device.
The setting table
Congratulations, the basic configuration has been completed.
When restarting the device, the ADSL LED should blink, which indicates attempt of synchronization. In the Device Info window there is possibility of monitoring status of the router. When the link is set up correctly, the information Line Rate- Upstream/ Line Rate- Downstream will also be displayed.
The synchronization process includes network identification of the device - external IP address, default gateway, DNS server etc. The procedure can take up to 2 minutes.
Device Info window
IP address can be changed in the Advanced Setup >> LAN window, similarly to parameters of DHCP server.

Setting IP and DHCP parameters
Settings of Access Point can be changed in Wireless window. In the screenshot below there is shown its default configuration. The initial region is the United States, so it should be changed according to actual location.
In the Wireless >> Basic window the user can:
  • switch on/off wireless interface (Enable Wireless)
  • switch on/off SSID broadcasting (Enable SSID Broadcast)
  • change SSID
  • choose region

Basic wireless settings
It is important to choose adequate region:
Choosing the region of operation
In the Wireless >> Advanced window the user can:
  • change Access Point mode
  • change Access Point channel
  • enable QoS
  • change other advanced parameters of Access Point

Advanced settings of Access Point
To secure WiFi it is needed to enable data encryption and set cryptographic keys. By default security options are disabled. The settings can be performed in Wireless >> Security window.

Wireless Security window. By default security options are disabled (Network Authentication - Open, WEP Encryption - Disabled)
Currently one of the best security measures in WLANs is WPA2-PSK encryption, the option shown in the window below. "Click here to display" opens new window with the current cryptographic key (after clicking Save/Apply).

Wireless Security - WPA2-PSK encryption.
It is indispensable to change the default passwords in the Management >> Access Control >> Password window. On the Internet there are active programs which try to log in to routers of the users that have forgotten to do so:

Password window
It is reasonable to save the configuration data:
In the Management >> Settings >> Backup window the user can backup the configuration data to hard drive of the computer.
Configuration backup window
The Management >> Settings >> Update window allows to restore the backup configuration.
The Managment >> Settings >> Restore Default window allows to restore default settings.

NOTICE! THIS OPTION IRREVERSIBLY DELETES ALL ENTERED PARAMETERS/DATA