Cannot receive IP from cable modem

How did you connect the computer to the router. If you are using a DSL modem it will have a DHCP server in it that is allocating IP addresses across your network. If you added the router to the computer via a hub or network switch what is the computers ip .
address. Remove the WI FI router - turn off P.C and then Go to cmd or dos prompt if windows based system and type in ipconfig and press enter to see if ip addresses are 10.0.0.2 if they are your dlink router uses 192.168.0.1 so you need to make the dlink router ip addressand subnet setting to match the Modem ip addresses of the DHCP server. Change the ip address of the dlink router to be 10.0.0.2 and change the modem to allocate DHCP IP addresses from 10.0.0.10 to 10.0.0.255. Only do this if IP addresses are 10,0,0,1 to 10.0.0.,254 on the desktop p.c with the dsl or cable modem connected.without the router being involved. (you may need to ask the ISP what the user name and password is of the modem and it should be ip address xx.xx.xx.1 so type this into a browser to change the modem settings. 10.0.0.1 or 192.168.0.1 just remember if the modem is 192.168.0.1 so is the Wi router from d-link and you will have an ip clash problem)
. How do you do this by ethernet connection from only the desktop directly with only the Wi FI . router. Go to a internet browser and type in the URL 192.168.0.1 and then change the router ip address to match what the DSL modem DHCP issues..
Page 14 of Router instructions see http://files.dlink.com.au/Products/DIR-615/Manuals/DIR-615_C2_Manual_v3.10.pdf
in the manual it states to use a direct ethernet connection for the setup program but you need to be connected to the internet for it to work but if the IP addresses are wrong or clashing will have no internet. You also want to set the modem as the DCHP server and disable the DHCP server in the set up of the wi fi tand set the WI FI router default gateway as the ip address of the Modem. if any DHCP server options in the WI FI router sert to the modem ip address. .

You need to read the router set up in the manual for a cable modem.

You need to check that the device IP ranges are the same.

There is not a disconnection of the DHCP server in the router listed, but there is some advice on setting up the router as a wireless extender which might be useful.

http://www.downloads.netgear.com/files/GDC/WNDR4000/WNDR4000_UM_06May2013.pdf

what is the ip address of the cable modem ?
when connected directly to the modem can you do ipconfig in dos command window and find out the gateway ip address listed.
This has to be the gateway ip address in the wi fi router.
turn of DCHP server in the WI FI router and make its ip address one more than the cable modem ip address.
make sure subnet mask is the same in both devices
Make sure DHCP server in Modem has leases above 20 to allow other devices to use 1 - 19 .
eg 10.0.0.1 or 192.168.0.1 for cable modem ip address internally.
make wi fi router 10.0.0.2 or 192.168.0.2 depends on the ip address of modem ?
Gateway address of 10.0.0.1 or 192.168.0.1 depends on the ip address of modem ?
dhcp server leases from 10.0.0.21 to 10.0.0.254 depends on ip address of modem ?

You shouldn't be connecting the device directly to your ISP, but rather to a modem that is connected to the ISP. The modem will then handle the NAT for your network and your E4200 should be able to pick up a private IP address using DHCP from your modem. Or you can set a static IP on your wireless router as long as that address is available and on the same subnet as your modem. You should also exclude any static IP addresses from being handed out over DHCP so you avoid IP addressing conflicts.

I think there is no need to replace the ADSL2+ Router.
Belkin is fine and should work well in combination with the D-Link Router and you would get the downlink data rate up to 300Mbps.
I recommended that you use Belkin Router as ADSL Modem and Dlink to provide wireless access. (Instead of buying ADSL Modem)
So, all you have to do is : -
-Turn-off wireless signal of the Belkin modem.
-Connect the Dlink Router to the Modem (Belkin) through CAT6 Cable.
-Configure the Dlink Router, Secure it and Enjoy 300Mbps Data Rate.

(In this way your Belkin will serve as ADSL Modem and Dlink would be the wireless router)

Let me know if any further clarification/ assistance is required.
Hope it helps! Good Luck!
CreativeTECH

If the Internet light is off then there is a problem with the phone line to the ADSL modem or the modem is faulty or there is a problem at the telephome exchange.
Disconnect the phone cable at the ADSL modem and connect a phone handset to this cable - check for a dial tone and that you can dial out.
If you don't get a dial tone, use a different or new phone cable.
If the phone line is OK then : -
Ring your ISP to get them to test your connection to your ADSL
modem.

it seems that ur PC & cable modem configuration is ok, now the problem is with ur router WAN interface configuration. the problem would be one out of 2 - first to check whether ur router wan interface is configured properly to obtain IP address from DHCP (if possible, u can give the static ip address with same series as cable modem) second to check with ur ISP.

If the modem is actually passing out DHCP, then you have to connect the modem to the router 4 port lan side and not the wan port. Give the router a static ip like 192.168.1.2 and you can talk to it and configure the wireless features.

pls check your connection between the switch and the router,dsl,access point.
2.make sure the gateway router is receiving good signals

wonderful! that's always a good thing to hear - sometimes it is the "make sure you're power cord is plugged in" problem, eh :)