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Windows 7: MAC address conflict (wireless) resolved with arp -a

29 Jan 2013   #1
Mr Davo

Windows 7 (XP, by Virtualization)
MAC address conflict (wireless) resolved with arp -a

Hi Everyone,

I had a very strange issue when setting up a DHCP reservation on my router. Whilst attempting the setup my Windows 7 computer was reporting one MAC address (both under ipconfig & through a program called Change MAC Address) and my router was reporting another (and NO there weren't other wireless devices connected to the router which I was not aware of!).

I Googled the subject, naturally, and didn't come up with much - however by shear luck I did stumble across a solution - this is what I did!

1). Opened a command prompt
2). Typed "arp -a" (minus the double talking marks) and hit enter
3). Opened Control Panel --> Network & Sharing Center --> Change Adaptor Settings
4). Right clicked on Wi-Fi Adapter & selected properties
5). Double clicked "Internet Protocol Version 4 (TCP/IPv4)"

*** At this point another Properties dialog box opens ***

6). Clicked on OK (didn't change any of the values!)
7). Clicked on OK (again didn't change any values!)
8). Ran the "arp -a" command again
9). Rebooted the Wireless Router & the computer

I did attempt various reboot combinations with the Wireless Router and the laptop before running the "arp -a" command as stated above, however these efforts didn't prove fruitful.

I hope that this helps somebody else out there on the web.

Kind Regards,


My System SpecsSystem Spec
30 Jan 2013   #2

Windows 7 Ultimate x64

Arp command
  -a            Displays current ARP entries by interrogating the current
                protocol data.  If inet_addr is specified, the IP and Physical
                addresses for only the specified computer are displayed.  If
                more than one network interface uses ARP, entries for each ARP
                table are displayed.

  -g            Same as -a.
I'm curious why you think arp -a fixed your issue.

Did you use the change mac progran before this?
My System SpecsSystem Spec

 MAC address conflict (wireless) resolved with arp -a

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