Chapter 5 Troubleshooting the DOCSIS Cable Modem
How Do I Renew the IP Address on My PC?
If your PC cannot access the Internet after the cable modem is online, it is possible
that your PC did not renew its IP address. Follow the appropriate instructions in this
section for your operating system to renew the IP address on your PC.
Renewing the IP Address on Windows 7 Systems
1 Click the Windows Start button.
2 Type cmd in the Search box. The cmd window opens.
3 Type ipconfig /renew and press Enter to renew the IP address of the computer.
Renewing the IP Address on Windows XP Systems
1 Click Start, and then click Run. The Run window opens.
2 Type cmd in the Open field and click OK. A window with a command prompt
opens.
3 Type ipconfig /release at the C:/ prompt and press Enter. The system releases
the IP address.
4 Type ipconfig /renew at the C:/ prompt and press Enter. The system displays a
new IP address.
5 Click the X in the upper-right corner of the window to close the Command
Prompt window. You have completed this procedure.
Note: If you cannot access the Internet, contact your service provider for further
assistance.
Renewing the IP Address on Macintosh Systems
1 Close all open programs.
2 Open your Preferences folder.
3 Drag the tcp/ip preferences file to the Trash.
4 Close all open windows and empty the Trash.
5 Restart your computer.
6 As your computer starts, simultaneously press and hold down the Command
(Apple), Option, P, and R keys on your keyboard. Keeping those keys pressed
down, power on your Macintosh but do not release these keys until you hear the
Apple chime at least three times; then, release the keys and let the computer
restart.
7 When your computer fully reboots, click the Apple icon in the upper-left corner
of the Finder. Scroll down to Control Panels, and then click TCP/IP.
8 Click Edit on the Finder at the top of the screen. Scroll down to the bottom of the
menu, and then click User Mode.
9 Click Advanced in the User Mode window, and then click OK.
10 Click the Up/Down selector arrows located to the right of the Connect Via
section of the TCP/IP window, and then click Using DHCP Server.
