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
```

**Update Network Interface Configuration:**
Open `/etc/network/interfaces` in a text editor:
```bash
vim /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.

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

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

- **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.

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

- **Add a New Virtual Bridge Configuration:**
   - Edit `/etc/network/interfaces`:
     ```bash
     vim /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.

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

### General Notes: