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How to track down duplicate MAC addresses out of the ARP table dump?

January 4, 2012 No Comments

Use this easy parsing command using uniq to pull duplicates out of the arp table dump that you can grab from your routers.

cat arp_dump_XXXXXXXXX.txt | awk ‘{print $1″ “$3}’ | uniq -D -w 17

That gives you the duplicates from row 1 and the read out of row 3 which is the IP address and Name.

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Mark Nudelman

I started working in the Software and IT industry at Broderbund Software way back in 1992, I have been lucky to find myself in careers throughout my life that I truly love. Some of my best years was my Sr Network Engineer/co-owner position at Delta PC in the late 90's, truly enjoying my 20's working in a fast paced start-up. However, by far the happiest employer I have had the honor of working for is VMware. I was laid-off in 2020 after my 13th anniversary with VMware, but was hired back in 2022! Great to be back at this amazing company!

I.T. is my love, my life, my passion!

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active directory apple autodeploy automation cli cloud convert database esxi hacking hardware htaccess itunes java linux malware & virus management monitoring mysql network nsx PathSolutions php powercli powershell routers & switches saas security server snmp sql server ssl storage tips & tricks tools troubleshooting upgrade vcd vCenter virtual Virtual Center vmware website windows wordpress
  • Home
  • Who am I?
  • My Resume

Love I.T., Live I.T., Embrace I.T.

My little Information Technology blog