How to find out or check conflict ip address Linux System Centos 7
Some time as sysadmin we face a problem where a server some time unreachable some time reachable but when we ping never rto, and the problem gone when we restart the network, i can be caused by conflict IP address, it happen when more than one interface have same IP address on same network
Step 1: Install arp scan
Install by running command line bellow
[root@ccontrol ~]# yum install epel-release
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirror.buana.web.id
* extras: mirror.buana.web.id
* updates: mirror.buana.web.id
Resolving Dependencies
--> Running transaction check
---> Package epel-release.noarch 0:7-11 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
================================================================================
Package Arch Version Repository Size
================================================================================
Installing:
epel-release noarch 7-11 extras 15 k
Transaction Summary
================================================================================
Install 1 Package
Total download size: 15 k
Installed size: 24 k
Is this ok [y/d/N]: y
Downloading packages:
epel-release-7-11.noarch.rpm | 15 kB 00:02
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : epel-release-7-11.noarch 1/1
Verifying : epel-release-7-11.noarch 1/1
Installed:
epel-release.noarch 0:7-11
Complete!
[root@ccontrol ~]#
[root@ccontrol ~]# yum install arp-scan
Loaded plugins: fastestmirror
epel/x86_64/metalink | 8.5 kB 00:00
epel | 4.7 kB 00:00
(1/3): epel/x86_64/group_gz | 95 kB 00:00
(2/3): epel/x86_64/primary_db | 6.7 MB 00:02
(3/3): epel/x86_64/updateinfo | 1.0 MB 00:12
Loading mirror speeds from cached hostfile
* base: mirror.buana.web.id
* epel: mirror.telkomuniversity.ac.id
* extras: mirror.buana.web.id
* updates: mirror.buana.web.id
Resolving Dependencies
--> Running transaction check
---> Package arp-scan.x86_64 0:1.9.2-1.el7 will be installed
--> Processing Dependency: perl(LWP::Simple) for package: arp-scan-1.9.2-1.el7.x86_64
--> Processing Dependency: perl(LWP::UserAgent) for package: arp-scan-1.9.2-1.el7.x86_64
--> Running transaction check
---> Package perl-libwww-perl.noarch 0:6.05-2.el7 will be installed
--> Processing Dependency: perl(WWW::RobotRules) >= 6 for package: perl-libwww-perl-6.05-2.el7.noarch
--> Processing Dependency: perl(URI) >= 1.10 for package: perl-libwww-perl-6.05-2.el7.noarch
--> Processing Dependency: perl(Net::HTTP) >= 6.04 for package: perl-libwww-perl-6.05-2.el7.noarch
--> Processing Dependency: perl(LWP::MediaTypes) >= 6 for package: perl-libwww-perl-6.05-2.el7.noarch
--> Processing Dependency: perl(HTTP::Status) >= 6 for package: perl-libwww-perl-6.05-2.el7.noarch
--> Processing Dependency: perl(HTTP::Response) >= 6 for package: perl-libwww-perl-6.05-2.el7.noarch
--> Processing Dependency: perl(HTTP::Request::Common) >= 6 for package: perl-libwww-perl-6.05-2.el7.noarch
--> Processing Dependency: perl(HTTP::Request) >= 6 for package: perl-libwww-perl-6.05-2.el7.noarch
--> Processing Dependency: perl(HTTP::Negotiate) >= 6 for package: perl-libwww-perl-6.05-2.el7.noarch
--> Processing Dependency: perl(HTTP::Date) >= 6 for package: perl-libwww-perl-6.05-2.el7.noarch
--> Processing Dependency: perl(HTTP::Daemon) >= 6 for package: perl-libwww-perl-6.05-2.el7.noarch
--> Processing Dependency: perl(HTTP::Cookies) >= 6 for package: perl-libwww-perl-6.05-2.el7.noarch
--> Processing Dependency: perl(File::Listing) >= 6 for package: perl-libwww-perl-6.05-2.el7.noarch
--> Processing Dependency: perl(URI::Heuristic) for package: perl-libwww-perl-6.05-2.el7.noarch
--> Processing Dependency: perl(URI::Escape) for package: perl-libwww-perl-6.05-2.el7.noarch
--> Processing Dependency: perl(HTML::HeadParser) for package: perl-libwww-perl-6.05-2.el7.noarch
--> Processing Dependency: perl(HTML::Entities) for package: perl-libwww-perl-6.05-2.el7.noarch
--> Processing Dependency: perl(Encode::Locale) for package: perl-libwww-perl-6.05-2.el7.noarch
--> Processing Dependency: perl(Digest::MD5) for package: perl-libwww-perl-6.05-2.el7.noarch
--> Running transaction check
---> Package perl-Digest-MD5.x86_64 0:2.52-3.el7 will be installed
--> Processing Dependency: perl(Digest::base) >= 1.00 for package: perl-Digest-MD5-2.52-3.el7.x86_64
---> Package perl-Encode-Locale.noarch 0:1.03-5.el7 will be installed
---> Package perl-File-Listing.noarch 0:6.04-7.el7 will be installed
---> Package perl-HTML-Parser.x86_64 0:3.71-4.el7 will be installed
--> Processing Dependency: perl(HTML::Tagset) >= 3 for package: perl-HTML-Parser-3.71-4.el7.x86_64
---> Package perl-HTTP-Cookies.noarch 0:6.01-5.el7 will be installed
---> Package perl-HTTP-Daemon.noarch 0:6.01-8.el7 will be installed
--> Processing Dependency: perl(IO::Socket::IP) for package: perl-HTTP-Daemon-6.01-8.el7.noarch
---> Package perl-HTTP-Date.noarch 0:6.02-8.el7 will be installed
--> Processing Dependency: perl(Time::Zone) for package: perl-HTTP-Date-6.02-8.el7.noarch
---> Package perl-HTTP-Message.noarch 0:6.06-6.el7 will be installed
--> Processing Dependency: perl(IO::Uncompress::Bunzip2) >= 2.021 for package: perl-HTTP-Message-6.06-6.el7.noarch
--> Processing Dependency: perl(IO::Compress::Bzip2) >= 2.021 for package: perl-HTTP-Message-6.06-6.el7.noarch
--> Processing Dependency: perl(IO::Uncompress::RawInflate) for package: perl-HTTP-Message-6.06-6.el7.noarch
--> Processing Dependency: perl(IO::Uncompress::Inflate) for package: perl-HTTP-Message-6.06-6.el7.noarch
--> Processing Dependency: perl(IO::Uncompress::Gunzip) for package: perl-HTTP-Message-6.06-6.el7.noarch
--> Processing Dependency: perl(IO::HTML) for package: perl-HTTP-Message-6.06-6.el7.noarch
--> Processing Dependency: perl(IO::Compress::Gzip) for package: perl-HTTP-Message-6.06-6.el7.noarch
--> Processing Dependency: perl(IO::Compress::Deflate) for package: perl-HTTP-Message-6.06-6.el7.noarch
--> Processing Dependency: perl(Compress::Raw::Zlib) for package: perl-HTTP-Message-6.06-6.el7.noarch
---> Package perl-HTTP-Negotiate.noarch 0:6.01-5.el7 will be installed
---> Package perl-LWP-MediaTypes.noarch 0:6.02-2.el7 will be installed
--> Processing Dependency: mailcap for package: perl-LWP-MediaTypes-6.02-2.el7.noarch
---> Package perl-Net-HTTP.noarch 0:6.06-2.el7 will be installed
--> Processing Dependency: perl(IO::Socket::SSL) >= 1.38 for package: perl-Net-HTTP-6.06-2.el7.noarch
---> Package perl-URI.noarch 0:1.60-9.el7 will be installed
--> Processing Dependency: perl(Business::ISBN) for package: perl-URI-1.60-9.el7.noarch
---> Package perl-WWW-RobotRules.noarch 0:6.02-5.el7 will be installed
--> Running transaction check
---> Package mailcap.noarch 0:2.1.41-2.el7 will be installed
---> Package perl-Business-ISBN.noarch 0:2.06-2.el7 will be installed
--> Processing Dependency: perl(Business::ISBN::Data) >= 20120719.001 for package: perl-Business-ISBN-2.06-2.el7.noarch
---> Package perl-Compress-Raw-Zlib.x86_64 1:2.061-4.el7 will be installed
---> Package perl-Digest.noarch 0:1.17-245.el7 will be installed
---> Package perl-HTML-Tagset.noarch 0:3.20-15.el7 will be installed
---> Package perl-IO-Compress.noarch 0:2.061-2.el7 will be installed
--> Processing Dependency: perl(Compress::Raw::Bzip2) >= 2.061 for package: perl-IO-Compress-2.061-2.el7.noarch
---> Package perl-IO-HTML.noarch 0:1.00-2.el7 will be installed
---> Package perl-IO-Socket-IP.noarch 0:0.21-5.el7 will be installed
---> Package perl-IO-Socket-SSL.noarch 0:1.94-7.el7 will be installed
--> Processing Dependency: perl-Net-SSLeay >= 1.55-5 for package: perl-IO-Socket-SSL-1.94-7.el7.noarch
--> Processing Dependency: perl(Net::SSLeay) >= 1.21 for package: perl-IO-Socket-SSL-1.94-7.el7.noarch
--> Processing Dependency: perl(Net::SSLeay) for package: perl-IO-Socket-SSL-1.94-7.el7.noarch
--> Processing Dependency: perl(Net::LibIDN) for package: perl-IO-Socket-SSL-1.94-7.el7.noarch
--> Processing Dependency: perl(Mozilla::CA) for package: perl-IO-Socket-SSL-1.94-7.el7.noarch
---> Package perl-TimeDate.noarch 1:2.30-2.el7 will be installed
--> Running transaction check
---> Package perl-Business-ISBN-Data.noarch 0:20120719.001-2.el7 will be installed
---> Package perl-Compress-Raw-Bzip2.x86_64 0:2.061-3.el7 will be installed
---> Package perl-Mozilla-CA.noarch 0:20130114-5.el7 will be installed
---> Package perl-Net-LibIDN.x86_64 0:0.12-15.el7 will be installed
---> Package perl-Net-SSLeay.x86_64 0:1.55-6.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
================================================================================
Package Arch Version Repository
Size
================================================================================
Installing:
arp-scan x86_64 1.9.2-1.el7 epel 336 k
Installing for dependencies:
mailcap noarch 2.1.41-2.el7 base 31 k
perl-Business-ISBN noarch 2.06-2.el7 base 25 k
perl-Business-ISBN-Data noarch 20120719.001-2.el7 base 24 k
perl-Compress-Raw-Bzip2 x86_64 2.061-3.el7 base 32 k
perl-Compress-Raw-Zlib x86_64 1:2.061-4.el7 base 57 k
perl-Digest noarch 1.17-245.el7 base 23 k
perl-Digest-MD5 x86_64 2.52-3.el7 base 30 k
perl-Encode-Locale noarch 1.03-5.el7 base 16 k
perl-File-Listing noarch 6.04-7.el7 base 13 k
perl-HTML-Parser x86_64 3.71-4.el7 base 115 k
perl-HTML-Tagset noarch 3.20-15.el7 base 18 k
perl-HTTP-Cookies noarch 6.01-5.el7 base 26 k
perl-HTTP-Daemon noarch 6.01-8.el7 base 21 k
perl-HTTP-Date noarch 6.02-8.el7 base 14 k
perl-HTTP-Message noarch 6.06-6.el7 base 82 k
perl-HTTP-Negotiate noarch 6.01-5.el7 base 17 k
perl-IO-Compress noarch 2.061-2.el7 base 260 k
perl-IO-HTML noarch 1.00-2.el7 base 23 k
perl-IO-Socket-IP noarch 0.21-5.el7 base 36 k
perl-IO-Socket-SSL noarch 1.94-7.el7 base 115 k
perl-LWP-MediaTypes noarch 6.02-2.el7 base 24 k
perl-Mozilla-CA noarch 20130114-5.el7 base 11 k
perl-Net-HTTP noarch 6.06-2.el7 base 29 k
perl-Net-LibIDN x86_64 0.12-15.el7 base 28 k
perl-Net-SSLeay x86_64 1.55-6.el7 base 285 k
perl-TimeDate noarch 1:2.30-2.el7 base 52 k
perl-URI noarch 1.60-9.el7 base 106 k
perl-WWW-RobotRules noarch 6.02-5.el7 base 18 k
perl-libwww-perl noarch 6.05-2.el7 base 205 k
Transaction Summary
================================================================================
Install 1 Package (+29 Dependent packages)
Total download size: 2.0 M
Installed size: 5.0 M
Is this ok [y/d/N]: y
Downloading packages:
(1/30): perl-Business-ISBN-Data-20120719.001-2.el7.noarch. | 24 kB 00:00
(2/30): perl-Compress-Raw-Bzip2-2.061-3.el7.x86_64.rpm | 32 kB 00:00
(3/30): perl-Business-ISBN-2.06-2.el7.noarch.rpm | 25 kB 00:00
(4/30): perl-Digest-1.17-245.el7.noarch.rpm | 23 kB 00:00
(5/30): perl-Encode-Locale-1.03-5.el7.noarch.rpm | 16 kB 00:00
(6/30): perl-Digest-MD5-2.52-3.el7.x86_64.rpm | 30 kB 00:00
(7/30): perl-File-Listing-6.04-7.el7.noarch.rpm | 13 kB 00:00
(8/30): perl-HTML-Tagset-3.20-15.el7.noarch.rpm | 18 kB 00:00
(9/30): perl-Compress-Raw-Zlib-2.061-4.el7.x86_64.rpm | 57 kB 00:00
(10/30): perl-HTML-Parser-3.71-4.el7.x86_64.rpm | 115 kB 00:00
(11/30): perl-HTTP-Cookies-6.01-5.el7.noarch.rpm | 26 kB 00:00
(12/30): perl-HTTP-Daemon-6.01-8.el7.noarch.rpm | 21 kB 00:00
(13/30): perl-HTTP-Date-6.02-8.el7.noarch.rpm | 14 kB 00:00
(14/30): perl-HTTP-Message-6.06-6.el7.noarch.rpm | 82 kB 00:00
(15/30): perl-HTTP-Negotiate-6.01-5.el7.noarch.rpm | 17 kB 00:00
(16/30): perl-IO-Compress-2.061-2.el7.noarch.rpm | 260 kB 00:00
(17/30): perl-IO-HTML-1.00-2.el7.noarch.rpm | 23 kB 00:00
(18/30): perl-LWP-MediaTypes-6.02-2.el7.noarch.rpm | 24 kB 00:00
(19/30): perl-IO-Socket-SSL-1.94-7.el7.noarch.rpm | 115 kB 00:00
(20/30): perl-Net-HTTP-6.06-2.el7.noarch.rpm | 29 kB 00:00
(21/30): perl-Mozilla-CA-20130114-5.el7.noarch.rpm | 11 kB 00:00
(22/30): perl-IO-Socket-IP-0.21-5.el7.noarch.rpm | 36 kB 00:00
(23/30): perl-Net-LibIDN-0.12-15.el7.x86_64.rpm | 28 kB 00:00
(24/30): perl-URI-1.60-9.el7.noarch.rpm | 106 kB 00:00
(25/30): perl-WWW-RobotRules-6.02-5.el7.noarch.rpm | 18 kB 00:00
(26/30): perl-TimeDate-2.30-2.el7.noarch.rpm | 52 kB 00:00
(27/30): perl-libwww-perl-6.05-2.el7.noarch.rpm | 205 kB 00:00
(28/30): perl-Net-SSLeay-1.55-6.el7.x86_64.rpm | 285 kB 00:00
(29/30): mailcap-2.1.41-2.el7.noarch.rpm | 31 kB 00:02
warning: /var/cache/yum/x86_64/7/epel/packages/arp-scan-1.9.2-1.el7.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID 352c64e5: NOKEY
Public key for arp-scan-1.9.2-1.el7.x86_64.rpm is not installed
(30/30): arp-scan-1.9.2-1.el7.x86_64.rpm | 336 kB 00:03
--------------------------------------------------------------------------------
Total 535 kB/s | 2.0 MB 00:03
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
Importing GPG key 0x352C64E5:
Userid : "Fedora EPEL (7) <[email protected]>"
Fingerprint: 91e9 7d7c 4a5e 96f1 7f3e 888f 6a2f aea2 352c 64e5
Package : epel-release-7-11.noarch (@extras)
From : /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
Is this ok [y/N]: y
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : 1:perl-Compress-Raw-Zlib-2.061-4.el7.x86_64 1/30
Installing : perl-IO-Socket-IP-0.21-5.el7.noarch 2/30
Installing : perl-Encode-Locale-1.03-5.el7.noarch 3/30
Installing : perl-HTML-Tagset-3.20-15.el7.noarch 4/30
Installing : perl-Digest-1.17-245.el7.noarch 5/30
Installing : perl-Digest-MD5-2.52-3.el7.x86_64 6/30
Installing : perl-Net-LibIDN-0.12-15.el7.x86_64 7/30
Installing : 1:perl-TimeDate-2.30-2.el7.noarch 8/30
Installing : perl-HTTP-Date-6.02-8.el7.noarch 9/30
Installing : perl-File-Listing-6.04-7.el7.noarch 10/30
Installing : perl-Net-SSLeay-1.55-6.el7.x86_64 11/30
Installing : perl-Business-ISBN-Data-20120719.001-2.el7.noarch 12/30
Installing : perl-Business-ISBN-2.06-2.el7.noarch 13/30
Installing : perl-URI-1.60-9.el7.noarch 14/30
Installing : perl-WWW-RobotRules-6.02-5.el7.noarch 15/30
Installing : perl-Mozilla-CA-20130114-5.el7.noarch 16/30
Installing : perl-IO-Socket-SSL-1.94-7.el7.noarch 17/30
Installing : perl-Compress-Raw-Bzip2-2.061-3.el7.x86_64 18/30
Installing : perl-IO-Compress-2.061-2.el7.noarch 19/30
Installing : perl-Net-HTTP-6.06-2.el7.noarch 20/30
Installing : perl-IO-HTML-1.00-2.el7.noarch 21/30
Installing : mailcap-2.1.41-2.el7.noarch 22/30
Installing : perl-LWP-MediaTypes-6.02-2.el7.noarch 23/30
Installing : perl-HTTP-Message-6.06-6.el7.noarch 24/30
Installing : perl-HTTP-Cookies-6.01-5.el7.noarch 25/30
Installing : perl-HTML-Parser-3.71-4.el7.x86_64 26/30
Installing : perl-HTTP-Negotiate-6.01-5.el7.noarch 27/30
Installing : perl-HTTP-Daemon-6.01-8.el7.noarch 28/30
Installing : perl-libwww-perl-6.05-2.el7.noarch 29/30
Installing : arp-scan-1.9.2-1.el7.x86_64 30/30
Verifying : perl-Business-ISBN-2.06-2.el7.noarch 1/30
Verifying : mailcap-2.1.41-2.el7.noarch 2/30
Verifying : perl-HTTP-Cookies-6.01-5.el7.noarch 3/30
Verifying : perl-IO-HTML-1.00-2.el7.noarch 4/30
Verifying : perl-Compress-Raw-Bzip2-2.061-3.el7.x86_64 5/30
Verifying : perl-HTML-Parser-3.71-4.el7.x86_64 6/30
Verifying : perl-LWP-MediaTypes-6.02-2.el7.noarch 7/30
Verifying : perl-WWW-RobotRules-6.02-5.el7.noarch 8/30
Verifying : perl-Digest-MD5-2.52-3.el7.x86_64 9/30
Verifying : perl-HTTP-Date-6.02-8.el7.noarch 10/30
Verifying : perl-HTTP-Message-6.06-6.el7.noarch 11/30
Verifying : perl-Encode-Locale-1.03-5.el7.noarch 12/30
Verifying : perl-IO-Socket-SSL-1.94-7.el7.noarch 13/30
Verifying : perl-Mozilla-CA-20130114-5.el7.noarch 14/30
Verifying : arp-scan-1.9.2-1.el7.x86_64 15/30
Verifying : perl-Business-ISBN-Data-20120719.001-2.el7.noarch 16/30
Verifying : perl-IO-Socket-IP-0.21-5.el7.noarch 17/30
Verifying : perl-Net-SSLeay-1.55-6.el7.x86_64 18/30
Verifying : perl-HTTP-Negotiate-6.01-5.el7.noarch 19/30
Verifying : 1:perl-Compress-Raw-Zlib-2.061-4.el7.x86_64 20/30
Verifying : perl-libwww-perl-6.05-2.el7.noarch 21/30
Verifying : perl-HTTP-Daemon-6.01-8.el7.noarch 22/30
Verifying : perl-IO-Compress-2.061-2.el7.noarch 23/30
Verifying : perl-Net-HTTP-6.06-2.el7.noarch 24/30
Verifying : 1:perl-TimeDate-2.30-2.el7.noarch 25/30
Verifying : perl-Net-LibIDN-0.12-15.el7.x86_64 26/30
Verifying : perl-Digest-1.17-245.el7.noarch 27/30
Verifying : perl-HTML-Tagset-3.20-15.el7.noarch 28/30
Verifying : perl-URI-1.60-9.el7.noarch 29/30
Verifying : perl-File-Listing-6.04-7.el7.noarch 30/30
Installed:
arp-scan.x86_64 0:1.9.2-1.el7
Dependency Installed:
mailcap.noarch 0:2.1.41-2.el7
perl-Business-ISBN.noarch 0:2.06-2.el7
perl-Business-ISBN-Data.noarch 0:20120719.001-2.el7
perl-Compress-Raw-Bzip2.x86_64 0:2.061-3.el7
perl-Compress-Raw-Zlib.x86_64 1:2.061-4.el7
perl-Digest.noarch 0:1.17-245.el7
perl-Digest-MD5.x86_64 0:2.52-3.el7
perl-Encode-Locale.noarch 0:1.03-5.el7
perl-File-Listing.noarch 0:6.04-7.el7
perl-HTML-Parser.x86_64 0:3.71-4.el7
perl-HTML-Tagset.noarch 0:3.20-15.el7
perl-HTTP-Cookies.noarch 0:6.01-5.el7
perl-HTTP-Daemon.noarch 0:6.01-8.el7
perl-HTTP-Date.noarch 0:6.02-8.el7
perl-HTTP-Message.noarch 0:6.06-6.el7
perl-HTTP-Negotiate.noarch 0:6.01-5.el7
perl-IO-Compress.noarch 0:2.061-2.el7
perl-IO-HTML.noarch 0:1.00-2.el7
perl-IO-Socket-IP.noarch 0:0.21-5.el7
perl-IO-Socket-SSL.noarch 0:1.94-7.el7
perl-LWP-MediaTypes.noarch 0:6.02-2.el7
perl-Mozilla-CA.noarch 0:20130114-5.el7
perl-Net-HTTP.noarch 0:6.06-2.el7
perl-Net-LibIDN.x86_64 0:0.12-15.el7
perl-Net-SSLeay.x86_64 0:1.55-6.el7
perl-TimeDate.noarch 1:2.30-2.el7
perl-URI.noarch 0:1.60-9.el7
perl-WWW-RobotRules.noarch 0:6.02-5.el7
perl-libwww-perl.noarch 0:6.05-2.el7
Complete!
[root@ccontrol ~]#
Step 2 : Perform arp scan
Scan the ARP by running command line bellow
[maswachid@ccontrol ~]$ sudo arp-scan --interface ens32 -l
Interface: ens32, datalink type: EN10MB (Ethernet)
Starting arp-scan 1.9.2 with 256 hosts (http://www.nta-monitor.com/tools-resources/security-tools/arp-scan/)
192.168.1.1 00:b4:00:80:d2:9c (Unknown)
192.168.1.2 40:f2:e9:bc:24:10 IBM
192.168.1.3 a0:36:9f:82:18:cc Intel Corporate
192.168.1.4 40:f2:e9:bc:26:28 IBM
192.168.1.5 a0:36:9f:82:46:98 Intel Corporate
192.168.1.6 34:40:b5:9e:24:88 IBM
192.168.1.7 34:40:b5:9e:20:9c IBM
192.168.1.8 5c:f3:fc:4c:2f:c4 IBM Corp
192.168.1.9 5c:f3:fc:4c:bc:d8 IBM Corp
192.168.1.10 00:0c:29:77:c1:86 VMware, Inc.
192.168.1.11 00:0c:29:b6:d9:77 VMware, Inc.
192.168.1.80 00:0c:29:5f:5d:d5 VMware, Inc.
192.168.1.80 00:50:56:88:ad:77 VMware, Inc. (DUP: 2)
192.168.1.81 00:0c:29:0b:c8:25 VMware, Inc.
192.168.1.82 00:0c:29:3e:88:49 VMware, Inc.
192.168.1.83 00:0c:29:f0:45:f5 VMware, Inc.
From figure above you can find that IP 192.168.1.80 is duplicate, the sign is (DUP: 2) it is mean that there are 2 interface that use the same IP address,
Step 3 : Perform arp ping
You can use arping to test the IP address and mac address, the arping utility performs an action similar to ping command, but at the Ethernet layer. You can send ARP REQUEST to a neighbor host / computers.
[maswachid@ccontrol ~]$ sudo arping -I ens32 -c 2 192.168.1.82
ARPING 192.168.1.82 from 192.168.72.90 ens32
Unicast reply from 192.168.1.82 [00:0C:29:3E:88:49] 0.921ms
Unicast reply from 192.168.1.82 [00:0C:29:3E:88:49] 0.893ms
Sent 2 probes (1 broadcast(s))
Received 2 response(s)
[maswachid@ccontrol ~]$ sudo arping -I ens32 -c 2 192.168.1.80
ARPING 192.168.1.80 from 192.168.1.90 ens32
Unicast reply from 192.168.1.80 [00:0C:29:5F:5D:D5] 0.941ms
Unicast reply from 192.168.1.80 [00:50:56:88:AD:77] 1.031ms
Unicast reply from 192.168.1.80 [00:50:56:88:AD:77] 0.862ms
Sent 2 probes (1 broadcast(s))
Received 3 response(s)
-I ens32 : Specify network interface i.e. name of network device where to send ARP REQUEST packets. This option is required.
-c 2 : Stop after sending 2 ARP REQUEST packets
-c 2 : Stop after sending 2 ARP REQUEST packets
From figure above you can see the different, normal IP address replay ping with same mac address, duplicate IP address reply ping with some mac address
Step 4 : Conclusions
From figure above we know that 192.168.1.80 is conflic because when we perform arp-scan it appears twice and when we perform arp ping it replay form different mac
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