Is there an accepted way to request two IP addresses and reserve them for use by one machine?
I don't believe that I am allowed to get two IPs from a DHCP server with one interface and one MAC address (correct me if I am wrong).
If I choose a static IP, I can't stop the IP being allocated to someone else (correct me if I am wrong).
I would like multiple IP addresses. Is there some polite way I can request them without risking their being allocated to other people? I could forge a DHCP DORA handshake, but that doesn't seem like the right thing to do. Aside from the issue generating a MAC address, it doesn't seem like there should be a need to provide a MAC address; I only need the DHCP sever to NOT lease out an IP, it doesn't need to manage the IP and manage any associated MAC addresses. I'm happy to manage renewals, NACK and any other nuances.
I could randomly pick static IPs and potentially interfere with some other network user. Static virtual interfaces like this or this or this will work for the purposes of attaining multiple IPs, but DHCP won't be in control of issuing them. I cannot guarantee that they will be free.
You may assume that I am on a work network. I am allowed to connect an arbitrary number of different devices to the network (and hence get any number of IPs allocated with the full consent of the company). However, I only require two, but I only have one network interface (a Raspberry Pi). I understand that I have phrased this as a general networking problem; I only seek to find a solution relevant to the latest Rasberry Pi build (buster).