This is quite a rudimentary firewall that is just an ACL.
Layout
Every segment of this hierarchy of nodes will have its own firewall, and likewise inherit from the parent node.
Adding Rules
https://inv.nadeko.net/watch?v=DNsLLrCgK0U
- vmbr0 is the standard interface that proxmox uses
- protocol is the specific protocol we are targetting
- Source is which IP the packets are coming from
- Macros are specific policies pre-made
- SSH is a specific macro that allows SSH connection from specific source
- SSH is a specific macro that allows SSH connection from specific source