How do I block a MAC address on my network so that a PC with that particular MAC address cannot get any IP address from my DHCP server? You can do it in two ways: If you know the number of PC's on your network, then force MAC binding in DHCP and limit the range of available IP's in your DHCP to the number of PC's on your network.

To check that these settings are configured on your computer, refresh your IP address. To do this: • On a Windows PC, select Start > Run, in the Run dialog box type cmd and click OK. Skype for macbook air. At the command line prompt type in ipconfig /release, and then press. The current IP address is released, and the command prompt displays. At the command prompt, type in ipconfig /renew and press.

The new IP address displays. Close the command window.

• On a Mac, select System Preferences > Network > Built-in Ethernet > TCP/IP, then select Using DHCP from the drop-down list, and click on Renew DHCP lease. NOTE: Rebooting your computer is another way of renewing the IP address.