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DSL BROADBAND TROUBLESHOOTER

Updated on October 19, 2014

DSL BROADBAND TROUBLESHOOTER

First thing you need to do is to check the DSL (Digital Subscriber Line) modem/router link status.

Power LED:

It indicates that the modem is switched on.

DSL LED:

If DSL LED is holding stably, then the connection between DSL modem/router and ISP’s DSLAM (Digital Subscriber Line Access Multiplexer) server is working properly.(In some cases, depends on the type of modem, ADSL(Asymmetric Digital subscriber Line) or Link will be there which all refer to DSL only.)

Ethernet LED:

Steady light (blinking light in some modems) indicates that the Ethernet (LAN) connection with your system is working properly.

Internet LED:

Steady light (blinking light in some modems) indicates that the modem is connected with internet.

Case 1

DSL is blinking continuously/No DSL LED light

In this case, problem may be due to phone line or DSLAM port/DSL modem .

Troubleshooting:

1. Remove the DSL modem phone cable (RJ11 –single line telephone cable) and connect to the modem properly, then wait for few minutes to check the DSL link status. If DSL LED is not holding stably, trace the DSL modem phone cable connected to the modem to find any damage. If any damage/ break is found, replace the cable.

2.If you are using any splitter(In case of Landline phone/Fax with broadband connection),remove the splitter and phone cable may directly be connected to the modem to check the DSL link status. If DSL LED is stable, then your splitter is faulty.

3.No fruitful result is obtained even after direct connection of phone cable(RJ11 cable), contact your service provider to rectify your problem because the problem may be due to phone line copper cable(Telephone exchange to your end) or DSLAM port.(In rare case, problem may be due to faulty phone cable(RJ11) port of your modem.)

Case 2

DSL Link status is working properly but modem is unreachable

Troubleshooting:

1. Check the Ethernet LAN (RJ45) cable and its connectivity (From DSL Ethernet LAN port to your PC’s Ethernet LAN NIC port).

2. Change the Ethernet LAN port in your DSL modem and ping the modem

(For pinging, get the proper IP address of your DSL modem from the manual and go to the command prompt and execute the pinging operation.

(View the typical successful pinging on the photo capsule)

3. Change the Ethernet port in your PC if it has more than one Ethernet port and ping the modem/Connect your DSL modem to another PC or laptop and ping the modem. If successful pinging happens, the problem is due to your PC‘s faulty Ethernet NIC port.

4. If you are not able to reach DSL modem in all the above attempts, your DSL modem is faulty.

Case 3

DSL link status and LAN port connection from PC to DSL modem are functioning properly but unable to log in to DSL modem:-

Troubleshooting:-

1. Type the IP address of your router in the address bar of browser (older version DSL modem may not be compatible with the latest version browsers) http://192.168.1.1 (say your DSL Modem IP address is 192.168.1.1) and then press ‘enter’-you will be directed into modem/router page by asking username and password of your modem.

2.Enter the correct username and password.(please refer to your DSL router/modem manual or its official website to get the default IP address, username and password for logging in to DSL modem)

3. If you are unable to log in to DSL modem even after having entered the correct username and password, your DSL modem is faulty.

Case 4

DSL link status and log in status are successful but unable to access the internet

Troubleshooting:

You can verify/edit the existing configuration or you can delete the existing configuration and create a new one.

Verify/edit the existing configuration/Create a new connection:

1. Check/select the VPI and VCI parameters of your ISP

VPI (Virtual Path Identifier) and VCI (Virtual Circuit Identifier) which are used in ATM (Asynchronous Transfer Mode) cell to establish a connection between DSLAM and BRAS (Broadband Remote Access Server)/BNG (Broadband Network Gateway) server of your ISP.

2. ATM Quality of Service category may preferably be UBR (Unspecified Bit Rate) without PCR (peak cell rate);If UBR with PCR is selected ,choose maximum peak cell rate.

3. Choose the correct type of internet connection of your ISP (PPPoE/PPPoA/Bridging/MER Routing)

4. Choose the option-‘Obtain IP address automatically’ on WAN ISP setting page.

5. Enable –‘NAT (Network Address Translation)’ which enables LAN/Private network hosts to access the internet and enable/add default route.

6. Enter your username & password given by your ISP correctly and Continuous type/Always on mode may be preferred for setting up your connection.

7. Go to LAN interface setup page.

Enable-‘DHCP (Dynamic Host Configuration Protocol) server’ which will assign IP address to your hosts on LAN/Private network from the existing IP pool count.

In some modems/routers, you may need to enable the LAN physical ports.

8. DNS relay (optional)

In some DSL routers, DNS relay option will be available.

You can choose either auto-discovered DNS server option or user discovered DNS server option.

If you are selecting auto discovered DNS server option, your DSL router will depend on WAN side router of your ISP.

User discovered DNS server option eliminates dependence of your DSL router on WAN side router of your ISP. Preferably, you can set your ISP’s DNS server as your primary DNS server manually and you can set any of the following DNS servers as your secondary DNS server since it will speed up your internet connection/solve your ISP’s DNS related problems.

Google DNS servers:

1.8.8.8.8

2.8.8.4.4

Open DNS servers:

1.208.67.222.222

2.208.67.220.220

9. Save your WAN and LAN setting and reboot your DSL modem.

Typical DSL modem/router broadband configuration of BSNL ISP in India.

TP-LINK ADSL router

Type the IP address of your TP-LINK router in the browser: http://192.168.1.1 and press enter, you will be asked to enter the username and password of the DSL router. Enter the default username admin and default password admin and then press OK to configure the router.

Go to the interface setup menu and choose pvc2 virtual circuit which will assign VPI and VCI values as 0 and 35 automatically and status should be in active state

Select UBR in ATM QoS category (preferable)

PPPoE Connection:

WAN parameters for PPPoE configuration:

ISP Internet connection: PPPoE

ISP’s username &password :( enter the correct username & password (case sensitive) provided by your

ISP)

Encapsulation: PPPoE LLC

Bridge interface: Deactivated

Connection: Always On

Get IP address: Dynamic (If you are provided with a static IP address by your service provider, static IP address details may be used for configuration)

NAT: Enable

Default Route: ON/Yes and save the settings.

LAN parameters for PPPoE configuration:

DHCP server: Enable

DNS settings (optional): Auto discovered DNS server/ User discovered DNS server (IP address of DNS servers needs to be entered manually.)

Bridge Connection:

WAN parameters for Bridge configuration:

ISP Internet connection: Bridge mode

Encapsulation: Bridged LLC

Save the settings.

LAN parameters for Bridge configuration:

DHCP server: Enable

DNS settings (optional): Auto discovered DNS server/ User discovered DNS server (IP address of DNS servers needs to be entered manually.)

Go to the control panel and open Network connections folder.

Click on’ create a new connection icon’ under Network Tasks and new connection wizard setup page will be opened. Click Next, select connect to the internet option, click Next, select set up my connection manually, click Next, select connect using a broadband connection that requires a user name and password, click Next, enter the name of your ISP, click Next, enter your username and password provided by your ISP, then finally click finish to complete the connection setup.

In bridge mode, dial-up a modem is needed to connect to the internet. Unless, it is necessary to use Bridge connection (accessing internet through VPN etc),PPPoE connection is always preferred.

Case4

DSL Link status, DSL modem’s WAN and LAN parameters are correct but unable to access the internet.

Troubleshooting:

If DSL link status, DSL modem’s WAN and LAN parameters are verified and found to be correct, then the problem will be at ISP’s end only. (It may be due to DSLAM server/BNG server problem or port binding problem)Contact your ISP to fix the problem.

(Original content is available on my personal blog subtlespot.blogspot.com)

Successful Pinging
Successful Pinging
Typical DSL   modem/router   broadband configuration of BSNL ISP in India. TP-LINK ADSL router
Typical DSL modem/router broadband configuration of BSNL ISP in India. TP-LINK ADSL router
Typical DSL   modem/router   broadband configuration of BSNL ISP in India. TP-LINK ADSL router
Typical DSL modem/router broadband configuration of BSNL ISP in India. TP-LINK ADSL router
Typical DSL   modem/router   broadband configuration of BSNL ISP in India. TP-LINK ADSL router
Typical DSL modem/router broadband configuration of BSNL ISP in India. TP-LINK ADSL router
Typical DSL   modem/router   broadband configuration of BSNL ISP in India. TP-LINK ADSL router
Typical DSL modem/router broadband configuration of BSNL ISP in India. TP-LINK ADSL router
Typical DSL   modem/router   broadband configuration of BSNL ISP in India. TP-LINK ADSL router
Typical DSL modem/router broadband configuration of BSNL ISP in India. TP-LINK ADSL router
Bridge Configuration setup
Bridge Configuration setup
Bridge Configuration setup
Bridge Configuration setup
Bridge Configuration setup
Bridge Configuration setup
Bridge Configuration setup
Bridge Configuration setup
Bridge Configuration setup
Bridge Configuration setup
Bridge Configuration setup
Bridge Configuration setup
Bridge Configuration setup
Bridge Configuration setup

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    • receivetipstricks profile image

      Mrinal Saha 3 years ago from Jaipur,India

      wow , thanks for the useful information,, now i will know the reason and can troubleshoot it ,,

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