For your standalone Proxmox setup, switching between static and dynamic IP configurations and managing virtual bridges are important tasks. Below, I'll provide a concise guide to handle these changes effectively and safely.

### Switching from Static IP to DHCP:

- **Backup Configurations:** Always backup configuration files before making changes (`cp /etc/network/interfaces /etc/network/interfaces.bak`).

```bash
cp /etc/network/interfaces /etc/network/interfaces.bak
```

1. **Update Network Interface Configuration:**
   - Open `/etc/network/interfaces` in a text editor:
     ```bash
     nano /etc/network/interfaces
     ```
   - Change the `vmbr0` configuration from static to DHCP:
     ```bash
     auto vmbr0
     iface vmbr0 inet dhcp
         bridge-ports enp3s0
         bridge-stp off
         bridge-fd 0
     ```
   - Save the changes and exit the editor.

2. **Restart Networking to Apply Changes:**
   - Apply the new network settings:
     ```bash
     systemctl restart networking
     ```

3. **Find the New DHCP-Assigned IP Address:**
   - After the network restarts, check the assigned IP:
     ```bash
     ip addr show vmbr0
     ```

4. **Update `/etc/hosts` with the New IP:**
   - Edit the `/etc/hosts` file to replace the old static IP with the new one:
     ```bash
     nano /etc/hosts
     ```
   - Modify the line with the old IP to the new one you just obtained:
     ```plaintext
     192.168.86.62 whitebox.foxtrot.lan whitebox  # Old IP
     192.168.x.x whitebox.foxtrot.lan whitebox    # New DHCP IP
     ```
   - Save and exit.

5. **Reserve IP in DHCP Server (Optional but Recommended):**
   - To ensure the IP does not change on reboots, reserve the IP in your DHCP server settings to always assign the same IP to the MAC address of `vmbr0`.

### Creating a New Virtual Bridge (`vmbrX`):

1. **Add a New Virtual Bridge Configuration:**
   - Edit `/etc/network/interfaces`:
     ```bash
     nano /etc/network/interfaces
     ```
   - Add a new bridge configuration at the end of the file:
     ```bash
     auto vmbrX  # Replace X with the next available number
     iface vmbrX inet manual
         bridge-ports none
         bridge-stp off
         bridge-fd 0
     ```
   - Save and exit the editor.

2. **Activate the New Bridge:**
   - Restart the networking service to bring up the new bridge:
     ```bash
     systemctl restart networking
     ```

### General Notes: