What does IP address conflict mean?

IP address conflict means that in the same LAN, if two users use the same IP address at the same time, or one user has obtained an IP address through DHCP, and at this time there are other The user has set the same IP address through manual allocation, which will cause an IP address conflict and prevent one of the users from using the network normally.

#The operating environment of this tutorial: Windows 10 system, Dell G3 computer.

What does ip address conflict mean?

Causes and solutions to IP address conflicts

If two users use the same IP address at the same time in the same LAN, or a user An IP address has been obtained through DHCP, and at this time, other users have set the same IP address through manual allocation. This will cause an IP address conflict and prevent one of the users from using the network normally.

So, how should we avoid the occurrence of IP address conflicts? We can analyze it from the following aspects:

Causes of IP address conflicts:

　1. Many users do not know how to set parameters such as "IP address", "Subnet mask", and "Default gateway". Sometimes users do not get the information about the above parameters from the administrator, or the user does not know how to set them. Caused by modifying this information;

　2. Sometimes when administrators or users set parameters according to the parameters provided by the administrator, this situation can also occur due to errors in parameter input;

3. The most common problem is that maintenance personnel use temporary IP address applications during client maintenance and debugging. 4. It is not ruled out that someone steals other people's IP addresses, causing IP address conflicts.

Solution to LAN IP address conflict:

Option 1: Check one by one.

This is the most original method. When an IP address conflict occurs, check each computer in the LAN, find the computer that conflicts with it, and then modify the IP address. However, this is more time-consuming and is not suitable for use in large LANs. It is only suitable for use in small network environments.

Option 2: MAC address binding.

1. Check the MAC of the local computer and bind it: By running Winipcfg.exe or Ipconfig.exe in the local computer system, you can detect the MAC address of the network card. The details are as follows: In the Win9X system, click "Start" - "Run", enter "Winipcfg" in the text box and press Enter, the "IP Configuration" window will pop up. Select "PCI Fast Ethernet Adapeter" in the drop-down list. The text displayed in the "Adapter Address" column is the MAC address of the network card; run the ipconfig command with the "all" parameter at the DOS prompt of the WinNT system. , that is, ipconfig/all can also display the MAC address of the network card.

　2. Remotely test the MAC address of the computer: For network administrators, you can use the TCPNetView tool software to measure the MAC addresses of all computers in the LAN while sitting in front of your own computer. After the software is installed, execute tcpnv.exe to display the main window of the program. Select the "Refresh" command in the "File" menu, or directly press the "F5" key to start scanning existing computers in the LAN. , and then the computer name, IP address, and MAC address will be displayed. After you have obtained the MAC address of a computer's network card, you can record it and let the network administrator configure it on the gateway or firewall. The specific binding command varies depending on the gateway or firewall used. At this time, if other computers want to use the bound address, a prompt that the IP address has been used will appear.

Option 3: Switch security port.

In the past, routers and hubs were often used in networks, but now many LANs use switches. With the significant price reduction of switches in recent years, switches have taken a dominant position in the network market. The main reason is that switches are cost-effective and have flexible structures that can be flexibly configured as future applications change. For IP address conflicts encountered, you can also use the switch ports to isolate different departments to solve the problem. This is because the switch can be used to implement different management of different areas, and the divided network segments will not interfere with each other. The problem of IP address conflicts can be solved to a certain extent.

Option 4: Divide VLANs.

Although switches can be used to isolate network segments, thus avoiding IP address conflicts to a certain extent, it still cannot prevent errors caused by user configuration errors in network segments under the same port. IP address conflict. A better solution is to use switches to divide VLANs, and then use MAC address binding to handle it comprehensively.

Personal IP address conflict solution

• If the operating system of the computer you are using is: windows 98

Click "Start" → "Run" in the lower left corner, type: winipcfg, click "OK", in the pop-up window, click "Release All", and then click "Update All" to resolve the IP address conflict question.

If the system prompts that the update cannot be made, you need to restart the computer.

• If the operating system of the computer you are using is: windows 2000 or windows XP

Click "Start" → "Run" in the lower left corner, Type: ipconfig /release, click "OK", click "Start" → "Run", type: ipconfig /renew, click "OK" to resolve the IP address conflict.

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