Motorola 55631500500 ユーザーズマニュアル

B 

2 • Getting Started 

21 

  

This can occur if the SBG901 is configured to automatically obtain an IP address from a 
Dynamic Host Configuration Protocol (DHCP) server. When Autoconfiguration is enabled, 
Windows automatically assigns an IP address if the cable modem gateway is unable to 
obtain one. Because this automatically assigned IP address is not valid, you will not be 
able to access the Internet using the cable modem gateway. 

Check the following: 

• 

Your cable connections 

• 

Whether you can see cable-TV channels on your television 

After successfully verifying your cable connections and proper cable-TV operation, you 
can renew your IP address, see 

. 

Verifying the IP Address in Windows Vista 

Do the following to verify the IP address: 

1.  On the Windows Desktop, click Start. 

2.  Click All Programs. 

3.  Click Accessories. 

4.  Click Run to display the Run window. 

5.  Type cmd and click OK to open a command prompt window. 

6.  Type ipconfig and press Enter to display the IP Configuration. 

If an Autoconfiguration IP address is displayed, it indicates possible broadband network 
problems or an improper connection between your computer and the SBG901. The 
Autoconfiguration IP address, ranging from 169.254.0.0 to 169.254.255.255, is reserved 
for Automatic Private IP Addressing (APIPA).  

Renewing Your  IP  Address   

To renew your IP address in Windows XP or Windows Vista: 

1.  Open a command prompt window. 

A.  From the Windows Taskbar, click Start to open the Start menu. 

B.  Click Run to open the Run dialog. 

C.  Type cmd in the Open entry box and click OK. 

2.  Type ipconfig /renew and press ENTER. A valid IP address should appear 

indicating that Internet access is available. 

3.  Type exit and press ENTER to close the command prompt window.  

If after performing this procedure your computer cannot access the Internet, call your 
cable provider for help.