When i connected my belkin n150 it wont connect to the internet the modem light flashes amber ,It says connected on my laptop but the modem light wont stay green

Disconnect the ISP modem power and network / cable. Do the same with the router. Wait a few minutes and reconnect starting with modem.

This indicates that router can't detect cable modem or this is unresponsive, probably your modem is logically tied with your PC (MAC address associated), that's why when you connect them directly work fine, if this is the case, you'll have to clone the MAC address of your PC into your router, this should be at Setup Menu, Manage MAC addresses option.

f the modem light keeps blinking, it means that the router hasn't been configured yet. Also, rarely, it can be an issue with WAN port/modem port on the router or the ethernet cable connecting the modem to router or finally, modem may not be working as its not applicable in this case(as you said).

1.Connect comp.--(gray port) router (yellow port)--modem
2.On the computer, open the router page by typing 192.168.2.1 in the address bar of browser

NOTE : IF YOUR INTERNET SERVICE PROVIDER IS CABLE FOLLOW THE BELOW STEPS

3.Under Internet WAN , SELECT the connection type as Dynamic.->NEXT
4.On the far left column, click on "MAC address" under Internet WAN.
5.Click on clone and apply changes and finally check Internet status
6.If internet status > Not connected, we need to do a network power cycle
7.For this, unplug the power from router, then from modem, then unplug the coaxial cable from cable modem.
8. Wait for 60 sec, then connect the coaxial cable, then connect power to modem, wait for lights on modem to get steady, then finally, plug in the power to router.
Now, you may see proper lights lit on the router.
All my best wishes for a fast internet service through the router.

FOR PPPOE OR DSL CONNECTIONS
1.Under Internet WAN , SELECT the connection type as PPPOE ->NEXT
2.ENTER THE USERNAME & PASSWORD PROVIDED BY YOUR IN INTERNET SERVICE PROVIDER
3.CLICK ON APPLY CHANGES



For any advanced help, revert asap!
Thanks and regards,
MILAN

As i understand you have a router provided by your ISP: MTNL, you need to configure the Belkin router in Dynamic mode and not in PPPoE. Then restart the devices by unplugging the power from MTNL router and Belkin. Wait for 20 secs, then power up MTNL router 1st, wait for all lights to get steady and finally power up the Belkin wireless router. Then you will find the modem and internet light lit up properly.
For any further clarifications, revert!

Thanks and regards,
Arvind

Actually there is no problem with the Modem
First Get the following Information from your ISP

1 ) The Connection Type
2 ) If it is PPPoE then Get the user name and Password

Step 1 : Connect Modem - Router - Computer (Wired)

Step 2 : Open RSP By typing 192.168.2.1 on the Address Bar of the internet explorer

Step 3 : On the Left Side Under Internet WAN Click
Connection type

Step 4 : Leave the Password Blank and click Submit

Step 5 : Select the connection type as given by the ISP

Step 6 : Click Next

Step 7 : Type Username And Password for PPPoE ,Click Apply Changes

Step 8 : There is no need to type Any Host Name for dynamic Click Apply Changes

Step 9 : If it is A Cable connection then

Step 10 : On the left side Under Internet WAN Click MAC Address

Step 11 : Click Clone

Step 12 : Click Apply Changes

Step 13 : Restart the Router

Step 14 : Check the Internet Status

Change the connection type into Dynamic

Do you have a user name and password to connect to the internet?
If you have that then you will need to set the router to PPPOE connection.
If not , then you will need to set the router to DHCP mode.
First make sure that your computer will be able to go online through the modem. It is very simple and you don't need the CD.
You can set up the router like the DSL connection.
Click Here for more info on how to set up the router.