MAC address are similar result in similar ip address
By using "a-change MAC address V5.0", I did a test within same LAN, I have got two laptop A and B with Nortel Acess Point.
These laptop are getting IP address form Nortel AP automatically. Type of ip address is 10.70.72.x/24.
IP address for laptop A is 10.70.72.93/25 , and MAC is 00-91-4C-2A-2B-2C.
IP address for laptop B is 10.70.72.141/25, and MAC is 01-80-4C-29-22-29.
I changed the MAC address for laptop B to be similar to laptop A (i.e. form 01-80-4C-29-22-29 to 00-91-4C-2A-2B-2C ).
When I changed the MAC address , ip address for B has been changed to be similar to ip address for A as well,,,,,Why ? What is concept ? does it related to ARP protocol ?
I have not received notification message telling me that the are conflict in the ip addresses.
If laptop A tries to access the net first , then Laptop B can not access.
And if laptop B tries to access the net first , then laptop A can not access the net.
I tried to change ip addresses for one of the laptop , and keep MAC address similar for both of them, by configure laptop A manually with existing any ip address within the same LAN (i.e 10.70.72.141/25 has not been assigned to other PC within LAN) ),,,,,result still same I can not
The DHCP server uses MAC addresses to keep track of what IP addresses it has handed out. Hence if two devices with the same MAC address request an IP address from the DHCP server, it thinks the request came from the same device and hands out the same IP.
Why do you want to share MAC addresses anyway? Depending on the setup you will usually end up with very poor performance.
As a followup, I assume this is in Linux? Windows usually displays a nice error message and disables the interface if you have conflicting MAC addresses.
MAC address are similar result in similar ip address 
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