Can´t use the Internet with router dlink di-524

Hi, I have the following situation:

Machines A, B, a router and a cable modem.

When connected directly with the cable modem, machine A get its
own IP address.
When connected directly with cable modem Machine B can´t get its own IP address. (it never renews the ip).

When I plug both in the router, only machine A gets its own fake ip, and none of them connects to the Internet.

When I try wan/dhcp renew on the router it says: dhcp conecting ... and then dhcp client disconected.

Only machine A can talk to the router.(192.168.0.1).

The router has cloned the mac address of machine A.

Could a NIC(machine A) be in a state where it can communicate with the router but not with the cable modem when pluged directly? I am thinking about trying a new NIC, but it doesn´t seem right that a NIC is good enough to comunicate with a router but not good enough to get an IP through the cable modem.

Thanks,

Rafael

Sorry, I got the situation confused on post 1, what´s happening is:

Machines A, B, a router and a cable modem.

When connected directly with the cable modem, machine A doesn´t get its
own IP address.

When connected directly with cable modem Machine B get its own IP address.

When I plug both in the router, only machine A gets its own fake ip, and none of them connects to the Internet.

When I try wan/dhcp renew on the router it says: dhcp conecting ... and then dhcp client disconected.

Only machine A can talk to the router.(192.168.0.1).

The router has cloned the mac address of machine A.

Could a NIC(machine A) be in a state where it can communicate with the router but not with the cable modem when pluged directly? I am thinking about trying a new NIC, but it doesn´t seem right that a NIC is good enough to comunicate with a router but not good enough to get an IP through the cable modem.

Thanks,

Rafael

Problem solved, but thanks anyway.

Could you post the solution so it might help someone else having the same problem?

FWIW, it takes more than a few minutes for someone to answer questions, as we are all, in different locations around the world.

Sure, I will be glad to do that: This is what happened:

One day my Internet went off, I tried a few things and made it work
without the router. After a while, the computer could no longer access
the Internet. I thought it was the signal, so I called the cable
company who monitored the signal. They told me the signal was ok but
the cable modem could be in trouble. So they switched the cable modem
and one of the machines began to access the Internet. The other did
not access the Internet, neither did the router. He told me the
problem was internal, and they didn´t solve that sort of issue. I then
tried lots of things and realized that, while trying to solve the
problem, I had plugged the cable jack on an regular ethernet port,
not on the wan port. So I put the plugs in the right places,
connected with the dhcp client and all worked.

Lesson: When trying to fix something, make sure the cable plug is on
the wan port!(I used to have a hub and made me used to ignoring that).
Always check the router lights to see if they are what they are
supposed to be.

Welcome to Virtual Dr!

And thanks for posting your solution!