Viewing configuration by using ipconfig /all

 

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When you troubleshoot a TCP/IP networking problem, begin by checking the TCP/IP configuration on the computer that is experiencing the problem. You can use the ipconfig command to get host computer configuration information, including the IP address, subnet mask, and default gateway.

 Note:

• For Windows 95 and Windows 98 clients, use the winipcfg command instead of ipconfig.

When you use the ipconfig command with the /all option, a detailed configuration report is produced for all interfaces, including any configured serial ports. With ipconfig /all, you can redirect command output to a file and paste the output into other documents. You can also use this output to confirm the TCP/IP configuration of each computer on the network or to further investigate of TCP/IP network problems.

For example, if a computer is configured with an IP address that is a duplicate of an existing IP address, the subnet mask appears as 0.0.0.0.

The following example shows the output of the ipconfig /all command on a computer that is configured to use the DHCP server for automatic TCP/IP configuration, and WINS and DNS servers for name resolution.

Windows 2000 IP Configuration

        Node Type . . . . . . . . . : Hybrid
        IP Routing Enabled. . . . . : No
        WINS Proxy Enabled. . . . . : No

Ethernet adapter Local Area Connection:

        Host Name . . . . . . . . . : corp1.microsoft.com
        DNS Servers . . . . . . . . : 10.1.0.200
        Description . . . . . . . . : 3Com 3C90x Ethernet Adapter
        Physical Address. . . . . . : 00-60-08-3E-46-07
        DHCP Enabled. . . . . . . . : Yes
        Autoconfiguration Enabled . : Yes
        IP Address. . . . . . . . . : 192.168.0.112
        Subnet Mask . . . . . . . . : 255.255.0.0
        Default Gateway . . . . . . : 192.168.0.1
        DHCP Server . . . . . . . . : 10.1.0.50
        Primary WINS Server . . . . : 10.1.0.101
        Secondary WINS Server . . . : 10.1.0.102
        Lease Obtained. . . . . . . : Wednesday, September 02, 1998 10:32:13 AM
        Lease Expires . . . . . . . : Friday, September 18, 1998 10:32:13 AM

If no problems appear in the TCP/IP configuration, the next step is testing the ability to connect to other host computers on the TCP/IP network.

Refreshing configuration by using ipconfig /renew

 

When you troubleshoot a TCP/IP networking problem, begin by checking the TCP/IP configuration on the computer that is experiencing the problem. If the computer is DHCP-enabled and is using a DHCP server to obtain configuration, you can initiate a refresh of the lease by using the ipconfig /renew command.

When you use ipconfig /renew, all network adapters on the computer that uses DHCP (except those that are manually configured) try to contact a DHCP server and renew their existing configuration or obtain a new configuration.

You can also use the ipconfig command with the /release option to immediately release the current DHCP configuration for a host. For more information about DHCP and the lease process, see How clients obtain configuration

 Note

• For Windows 95 and Windows 98 DHCP-enabled clients, use the release and renew options of the winipcfg command instead of ipconfig /release and ipconfig /renew to perform manual release or renewal of the IP configuration lease for a client.