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Can you have two machines with the same mac address on the same network?

wannabecraig
wannabecraig asked
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Last Modified: 2008-07-29
Hi,

I have a piece of software that is locked down to mac address. I have cloned the mac address of another PC to be the same. The question is, can I have the 2 PCs on the network together?
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Don JohnstonInstructor
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Commented:
What you happen? Will both PCs go down on just one?
If you ask a postman to deliver a letter on a street with more than one house with the same address, the postman may be confused.

Even if the postman broadcasts the correct owner to respond he will get multiple responses.

Translate that into networking packets and the protocol trying to decipher a packet's destination or source.

Author

Commented:
What about if the the two different PCs are on different subnets?
When they are on different networks, packets are routed at a higher level using say IP. That will allow you to setup a similar MAC on that network.

Ages ago, when software override (even virtualization) was not feasible, vendors used to specify different MACs to avoid any conflicts.
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