Solve DHCP failures in Windows operating systems

When we solve the DHCP failure of the Windows operating system, we sometimes find out which addresses are not used in an address range. Just create a batch file and ask it to return only those unused IP addresses, then enter the results of the command into a text file.

As a network administrator, when we solve the DHCP failure of the Windows operating system, we sometimes find out which addresses in an address range are not used. I have previously introduced a method: open a command prompt window, call the ping command in the For...in...Do loop. For example, to find out which addresses are not used in the address range 192.168.1.1 to 192.168.1.100, you can use this command: For /L %f in (1,1,100) Do Ping.exe -n 2 192.168.1.% f

This command reports all IP addresses in the specified range. Whether it is used or not, users have to scroll through a large amount of content in the command line window. In fact, we can avoid these troubles, just create a batch file, ask it to return only those unused IP addresses, and then enter the results of the command into a text file.

The following describes the method:

Open Notepad and enter the following command in the window:

@Echo off date /t > IPList.txt time /t > > IPList.txt echo =========== >> IPList.txt For /L %%f in (1,1,100) Do Ping.exe -n 2 192.168.1.%%f Find "Request timed out." echo 192.168.1.%%f Timed Out >> IPList.txt echo off cls Echo Finished! @Echo on Notepad.exe IPList.txt

Save this file as IPTracker.bat, close the Notepad program.

Note that in this batch file, the entire For...In...Do command consists of several commands that are joined by "&&". The command starts with "For" and ends with "Off", and the entire command must be on one line. Of course, if the user wants to use this method, the user's own IP address needs to be used to replace the IP address in the example.

In the future, if the user wants to solve the DHCP problem, you can locate and double-click the IPTracker.bat file in the browser window, and then start an IP address tracking tool. This batch only finds those unused IP addresses, and Save the results in a Notepad file. (In this case, the saved batch file becomes an IP address tracking tool, which can be created once and used repeatedly.)

Note: This method is only available for Windows XP Professional (Pro version)