Host only networks problem

[g1gop]

Apoligies if this has been covered but I did look and couldn't find an answer.
I am retired and this is all a hobby these days.
So I have lots of VM's of very old OS's and setups (NT4 systems (PDC,BDC,SQL6.5,Mail,Workstations etc,etc), W2K3,W2k9R", etc)
These are systems that I do not want to have access to the internet and at the moment I have them running under VirtualBox on my laptop (Mint).
Under VB I have then on separate host only networks (one for NT4 etc). Each has it's own complete setup with it's own DHCP server etc.
It works well but I want to move them onto the Proxmox.
Setup: proxmox 8.22 running on a Lenovo m910Q SFF.One network card.
I have created a few 'internal networks (see screenshot).
They seem to work but a DHCP server running on one network is giving out addresses to other networks too!
What am I missing? Have I just misunderstood how to set this up? Can it be done?
Before anyone asks 'Why', It's a hobby and I want to. no other reason. lol
Alan

 

[bbgeek17]

You should probably go through https://pve.proxmox.com/pve-docs/chapter-pvesdn.html and implement proper Zones/Vnets for isolation.

Good luck

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Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

 

[g1gop]

Thanks I will have a look.