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This article mainly introduces "how to know whether the IP address in Linux conflicts". In the daily operation, I believe many people have doubts about how to know whether the IP address in Linux is conflicting. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubt of "how to know whether the IP address in Linux is conflicting". Next, please follow the editor to study!

You all know what an IP address is, don't you? They are assigned to devices on the network to represent them. They are allocated through the DHCP server and change frequently. There are now two types of IP addresses. The dynamic ones often change (once every few days), while the static ones, like its name, are static, meaning they don't change.

Sometimes this leads to conflicts. When a dynamic IP is assigned and another network device already has the same IP. Or there are multiple DHCP servers that assign IP on the same network subnet. If you have connectivity problems and assume that they are caused by IP conflicts, you can use a tool called arp-scan to scan for them.

This tool sends ARP (Address Resolution Protocol) (address Resolution Protocol) packets on the local network to collect addresses. If multiple MAC addresses claim to have the same IP address, then there is a conflict.

To install arp-scan on Ubuntu or Debian, enter:

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$sudo apt-get install arp-scan

For Fedora,CentOS or RedHat:

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$sudo yum install arp-scan

To detect IP conflicts, run the following command:

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$sudo arp-scan-I eth0-l

Sample output:

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192.168.1.10 00:1b:a9:63:a2:4c BROTHER INDUSTRIES, LTD.

192.168.1.30 00:1e:8f:58:ec:49 CANON INC.

192.168.1.33 00:25:4b:1b:10:20 Apple, Inc

192.168.1.37 10:9a:dd:55:d7:95 Apple Inc

192.168.1.38 20:c9:d0:27:8d:56 (Unknown)

192.168.1.39 d4:85:64:4d:35:be Hewlett Packard

192.168.1.39 00:0b:46:e4:8e:6d Cisco (DUP: 2)

192.168.1.40 90:2b:34:18:59:c0 (Unknown)

In this example, the 192.168.1.39 IP conflicts because it occurs twice.

At this point, the study on "how to know whether the IP address in Linux is in conflict" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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