Cable modem connecting with USB Cable and LAN Cable

[Dekic]

Hello,
I'm experiencing a problem when connecting my computers to the same cable modem. The computer that is connected with the USB Cable is getting excellent connection, while the other one is terribly slow. I have tried to switch the connections but still the one with the USB Cable is faster. Can someone help me resolve my problem, and what can cause it ?
Thank you in advance, Dejan Gorgevic.

 

[TerryNet]

Does your ISP contract call for two public IP addresses? If not it's probably just an accident that you can connect at all with multiple computers.

 

[Dekic]

i have been using my internet like that for the last couple of years, but this problem started a week ago ...