techie said:
When I am behind a router, and send some TCP/IP packet to the internet, is my MAC address transmitted as source or the MAC address of the router is transmitted.
I use ethernet to connect devices on local network. I use my own MAC addresses which are unique inside the network but are re-used in other networks. Is this any cause of concern.
Like there are private IP ranges of 192.168.x.x and 10.x.x.x, is there a range of private MAC addresses.
In Norml cases , Mac address is burned on the ROM of your NIC , and it's unique 6 bytes address , half of it identify the Manufacture itself (unique) , and the other half is given by The Manufacture (unique number) so the whole Mac for certain NIC can't be assigned to another NIC .