Step 1. Copy the following commands into Notepad

Echo ipconfig/flushdns
ipconfig/flushdns
echo ipconfig/release
ipconfig/release
echo ipconfig/renew
ipconfig/renew
exit

Step 2. Save the file to changeip.bat
Step 3. Run the file (double click on it)

If you try to run this on Vista you have to to right-click the shortcut for the file and choose ‘Run as Administrator’.

Important! This works only if you are using a dynamic allocated IP address.

 

C:\Documents and Settings\Administrator>ipconfig ?

 

Error: unrecongnized or incomplete command line.

 

USAGE:

    ipconfig [/? | /all | /renew [adapter] | /release [adapter] |

              /flushdns | /displaydns | /registerdns |

              /showclassid adapter |

              /setclassid adapter [classid] ]

 

where

    adapter         Connection name

                   (wildcard characters * and ? allowed, see examples)

 

    Options:

       /?           Display this help message

       /all         Display full configuration information.

       /release     Release the IP address for the specified adapter.

       /renew       Renew the IP address for the specified adapter.

       /flushdns    Purges the DNS Resolver cache.

       /registerdns Refreshes all DHCP leases and re-registers DNS names

       /displaydns  Display the contents of the DNS Resolver Cache.

       /showclassid Displays all the dhcp class IDs allowed for adapter.

       /setclassid  Modifies the dhcp class id.

 

The default is to display only the IP address, subnet mask and

default gateway for each adapter bound to TCP/IP.

 

For Release and Renew, if no adapter name is specified, then the IP address

leases for all adapters bound to TCP/IP will be released or renewed.

 

For Setclassid, if no ClassId is specified, then the ClassId is removed.

 

Examples:

    > ipconfig                   ... Show information.

    > ipconfig /all              ... Show detailed information

    > ipconfig /renew            ... renew all adapters

    > ipconfig /renew EL*        ... renew any connection that has its

                                     name starting with EL

    > ipconfig /release *Con*    ... release all matching connections,

                                     eg. "Local Area Connection 1" or

                                         "Local Area Connection 2"

 

C:\Documents and Settings\Administrator>

 

 

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