How to get 3 ip on one gateway- interface by dhcp-client.

How to get 3 ip on one gateway- interface by dhcp-client.
ISP says i have show 3 mac-addresses. How do i can this?

You might like to re-phrase your question as it’s not clear, and consider a diagram as well.

I think his ISP gives 3 IPs via DHCP, but only if there are 3 different mac addresses with a DHCP client running on it.

Exactly!