24 Jun
2018
24 Jun
'18
10:20
On 2018-06-23 20:36, James Knott wrote:
On 06/23/2018 12:24 PM, Carlos E. R. wrote:
I suddenly remembered. It is possible to find out if the computer is in the same cable network by interrogating the network device at the other end for its MAC. As they are (in theory) world unique, if it is the same MAC as it was, the laptop has not moved. I believe it is possible to do this before activating tcpip.
You can't count on MAC addresses being unique any more, with MAC spoofing and cheap manufacturers that reuse MAC addresses.
Shame on them :-P
However, a MAC address does not have to be globally unique with IP. It only has to be unique on the local link.
I know. -- Cheers / Saludos, Carlos E. R. (from 42.3 x86_64 "Malachite" at Telcontar)