DNS Problem with Router

My friend has a router configuration where him modem is connected to his cable and then the router is connected to the modem. If you connect an Ethernet cable in to the modem, it works fine. However, if you connect an Ethernet cable into the router (The modem only has 1 port) and connect the router to the modem, we get the internet but cannot actually use the internet. Additionally, we can ping IP Addresses but we cannot ping Websites.

I believe it is a DNS issue but I have no clue how to solve DNS issues so here I am. If any of you need more information just tell me and I will have it ready for ya.

 

Hi Ultimaadragoon,

It reads like the ISP is only allowing 1 pc to connect through their service.

make sure the ethernet cable is connected from the modem to the router's uplink port (usually #1 or to the port that is not labeled with a number).

next, connect the original pc that has been used to access the internet into another port on the router.

using that pc's web browser, access the router settings and set the router to use dynamic ip. (this action should also allow the router to automatically obtain the ISP's DNS ip addresses). You can confirm DNS by checking the router's configuration settings after the setup is done.

*If no go on the DNS ip addresses, you'll have to acquire them from the ISP and manually enter them into the router.

while still in the router settings, find the option to clone the PC's mac address and activate it.

close the web browser.

connect the remaining pc's to the router.

next, power off (don't restart) all pc's.

pull the power cord out of the router. wait 10 seconds and power the router back up.

power up all pc's.

here's some info (from my d-link router) on cloning a pc's mac address

MAC Address: Each networking device has it's own unique MAC address defined by the hardware manufacturer. Some ISP's may check your computer's MAC address. Some ISP's record the MAC address of the network adapter in the computer or router used to initially connect to their service. The ISP will then only grant Internet access to requests from a computer or router with this particular MAC address. This router has a different MAC address than the computer or router that initially connected to the ISP. If you need to change the MAC address of the router's WAN-side Ethernet interface, either type in an alternate MAC address (for example, the MAC address of the router initially connected to the ISP) or copy the MAC address of a PC. To copy the MAC address of the computer that initially connected to the ISP, connect to the D-Link router using that computer and click the Clone Your PC's MAC Address button. The WAN interface will then use the MAC address of the network adapter in your computer.

Techsent

 

When my friend gets his next day off I will head over there and give this a shot!

I should mention that it worked perfectly fine until a few days ago.