How to check IP address conflicts 'Detailed introduction: Methods to detect IP address conflicts'

php editor Banana will introduce you in detail how to detect IP address conflicts. In the network, IP address conflicts may cause network connection problems and affect normal use. In order to solve this problem, we need to find the conflicting IP address and adjust it. This article will introduce you to several common methods, including using command line tools, using network scanning tools, and using the router management interface. Through these methods, you can quickly and accurately detect IP address conflicts and take appropriate measures to solve the problem. Next, let’s learn about the specific steps!

In the Linux system, no related functions are provided. If the local network uses a static IP address configuration and strange network connection problems occur, such as ssh connection reset, you can consider checking whether the IP address appears. Conflict issues.

The arping command provides the function of detecting address conflicts.

arping command

The arping command is a tool used to send arp requests to a neighboring host. arping uses arp packet, check the hardware address on the device through the ping command. Ability to test whether an IP address is already in use on the network and obtain more device information.

Function is similar to ping

The arping command is a tool used to send an ARP request to a neighboring host and check the hardware address on the device through the ARP response message. It can test whether an IP address is already in use on the network and obtain more device information. [Free IP address check]
https://www.ipdatacloud.com/ip/?utm-source=LJ&utm-keyword=?838 This function is similar to the ping command.

Ping that address on your computer, and the source mac address of the ping packet will be replied.

arping command options:

-b: used to send Ethernet broadcast frames (FFFFFFFFFFFF). arping uses the broadcast address initially and the unicast address after receiving the response.

-q: quiet output does not display any information;

-f: means to exit after receiving the first response message;

-timeout: setting A timeout in seconds. If the specified time is reached and arping has not received a complete response, it will exit;

-c count: Indicates that it will stop after sending the specified number of ARP request packets. If the deadline option is specified, arping will wait for the same number of arp response packets until timeout;

-s source: Set the value of the SPA field in the arp packet sent by arping. If it is empty, proceed as follows. If it is DAD mode (conflict address detection), it is set to 0.0.0.0. If it is Unsolicited ARP mode (Gratutious ARP), it is set to the target address, otherwise it is derived from the routing table;

-I interface: Set the network interface used by ping.

IP address conflict detection

On the problematic host, you can use the "arping -I ethN x.x.x.x" command (where x.x.x.x is the IP address of this interface) to detect address conflicts. If there is no output, it means there is no conflict with this IP address. If there is a conflict, this command displays the MAC address used by the conflicting IP address.

eg1:

For example, the IP address of my win7 system is now 192.168.23.44

I enter ipconfig/all on the cmd command to query my current mac address [Free search IP ownership】
https://www.ipdatacloud.com/ip/?utm-source=LJ&utm-keyword=?838

Check the reply on another Linux environment. The current reply is from the corresponding The mac reply explains that there is currently no IP conflict problem

eg2:

arping 192.168.1.X from 192.168.X. .X's reply mac address. If the current mac address reply does not match the mac you set, the current ip address conflicts.

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