heatwave

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 access the net , or ping.