MAC address are similar result in similar ip address

[zillah]

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 10.70.72.93/24 , and MAC is 00-91-4C-2A-2B-2C.

IP address for laptop B is 10.70.72.141/24, and MAC is 01-80-4C-29-22-29.

I changed the MAC address for laptop B to be same 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 same to the 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 10.70.72.141/24 has not been assigned to other PC within LAN) ),,,,,result still same I can not

[Will.Spencer]

Originally Posted by zillah

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 ?

That's not ARP, that's DHCP.

DHCP sees the MAC address and says to itself "Hey, I remember that MAC address. I have been giving it this IP address. I should give it the same IP address this time."

I'm a bit confused. What are you trying to accomplish?