Multiple IPs on

I have a server (from 2019) that I would like to transfer to a new one.
On this old server I have a proxmox container (LCX) with several IPs attached to it (on a single mac address) to host my sites

It seems that it is no longer possible to attach several IPs to a single mac address?

Do you know how I can do to transfer my IP to a new machine within a single container and make them work?

thanks in advance