I’m changing a server with a bare metal installation with one ip to a new cisco sever with esxi with 3 vm’s, one of them is going to be a nat router to nat the traffic to the other 2 vm’s, is there a way to keep using one just ip ?
I don’t think so, you will need at least 2 one for esxi virtual network to communicate with your network and one for your nat router vm to distribute the traffic via NAT
In fact if your server has CIMC you will need another one to have a remote access to CIMC if you need to recover the server, but it’s not mandatory because you can always connect to CIMC through the console.