MB ethernet issues

i have a MB & a MBP, which i am trying to use both to connect to the cable modem's ethernet cable. The MBP works great, but whenever i try to use the MB it uses a "self assigned ip" which doesnt work. I tried to manually insert the same addresses the MBP uses into the DHCP and Router spaces on the MB, but it just changes it back to the numbers that dont work and it continues to say "self assigned"
any ideas??? super frustrating.

Then first open Network preferences and click on the Ethernet port then click on the Advanced button. Click on the TCP/IP tab. Set the Configure IPv4 drop down menu to DHCP, set the Configure IPv6 drop down menu to OFF. Click on the Apply button.
Next, turn off both the cable modem and the computer. Wait at least one minute. Turn on the cable modem and wait until the status lights indicate communication with your ISP. Then turn on the computer. After the computer starts up you should have a valid IP address and internet connection.
If you decide to put the router back into the mix turn everything off, connect the cable modem to the router's WAN port. Connect all other devices to the LAN ports if they are not wireless. Be sure you wait at least one minute before first turning on the cable modem. Wait for status lights as before then turn on the router. Wait until its status light shows communication with the cable modem, then turn on the computers.

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