Different MAC Address with same mac_id

[xxconn]

1. When I add a new MAC address

2. The MAC address will have a mac_id

3. When I edit the MAC address and change its address

4. It will result in two record in the MacAuth list

5. And the two address have same mac_id

6. If I delete the old address, it will list the other address

7. And then it will remove the two address