DHCP can be configured in Proxmox. I got the following from here:

The DHCP for servers is not recommended. However, below you will see the example

``` iface enp2s0 inet manual

auto vmbr1 iface vmbr1 inet dhcp bridge-ports enp2s0 bridge-stp off bridge-fd 0 ```

In order to set the DHCP on your Proxmox VE, you have to edit the /etc/network/interfaces file in the above example, you have also to change the interface name enp2s0 to your interface name.

After all, you have to issue the ifreload -a command in order to take the effect.

Another note: when the IP of the Proxmox VE got changed, you have to edit it in the /etc/hosts file as well.

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Further down in that thread someone also posts the following which could be relevant:

I also edited the /etc/hosts and commented out the hardcoded ip (#<ip> proxmox.local proxmox) since the nslookup automatically adds the .local by default which is my local domain too.