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Re: ip neigh and arp – incorrect MAC address

"how I can scan my entire network for MAC Addresses assuming this "unknown" one is on my network"?

If you log into your router it should show you the name, MAC address and IP address of each device the router can see.
For example;  my router address is http://bthomehub.home/index.htm?pg=home.htm.   Or just bthomehub.home will do. 
Beyond that, I can't offer any advice. 

Keith
"how I can scan my entire network for MAC Addresses assuming this "unknown" one is on my network"?

If you log into your router it should show you the name, MAC address and IP address of each device the router can see.
For example;  my router address is http://bthomehub.home/index.htm?pg=home.htm.   Or just bthomehub.home will do. 
Beyond that, I can't offer any advice. 

Keith