Update docs/tech_docs/OPENwrt.md

docs/tech_docs/OPENwrt.md

@@ -87,3 +87,88 @@ After updating the configuration files, you should apply the changes:
 - **Backup Configurations**: Always back up your configurations before making significant changes.
 
 This streamlined guide provides a clear and effective method for deploying Proxmox containers with OpenWRT, configured for remote management access through SSH and HTTPS on the WAN interface.
+
+---
+
+### Creating a Virtual Bridge (vmbr) in Proxmox via CLI
+
+To create a new virtual bridge (`vmbrX`) on Proxmox using the command line, you need to edit the network configuration file located at `/etc/network/interfaces`. Here’s how you can do it:
+
+1. **Access the Proxmox Host**:
+   Connect to your Proxmox server via SSH.
+
+2. **Edit the Network Configuration File**:
+   Open the `/etc/network/interfaces` file in a text editor, such as `nano` or `vim`.
+   ```bash
+   vim /etc/network/interfaces
+   ```
+
+3. **Add Configuration for a New Bridge**:
+   Add the following lines to the file to create a new bridge. Replace `X` with the appropriate number for your new bridge.
+   ```bash
+   auto vmbrX
+   iface vmbrX inet static
+       address 192.168.X.1
+       netmask 255.255.255.0
+       bridge_ports none
+       bridge_stp off
+       bridge_fd 0
+   ```
+
+4. **Save and Apply Changes**:
+   Save the changes and restart the networking service to apply them.
+   ```bash
+   systemctl restart networking
+   ```
+
+This setup creates a bridge with no physical interfaces attached (isolated bridge). If you want to attach physical interfaces, replace `none` in `bridge_ports` with the name of the interface (e.g., `eth0`).
+
+### Adjusting Network Interface Configuration in OpenWRT
+
+To swap interfaces or change the DHCP setting to static IP or vice versa in OpenWRT, you can modify the `/etc/config/network` file. Here's how to make these adjustments:
+
+#### **Changing Interface Assignment (Swapping Interfaces)**
+
+If you want to change which physical interface (e.g., from `eth0` to `eth1`) is used for WAN, modify the `option ifname` line under the corresponding section:
+
+```bash
+config interface 'wan'
+    option ifname 'eth1'  # Changed from eth0 to eth1
+    option proto 'dhcp'
+```
+
+#### **Changing DHCP to Static IP (or Vice Versa)**
+
+To change an interface from DHCP to static IP:
+1. Change the `option proto 'dhcp'` to `option proto 'static'`.
+2. Specify the `option ipaddr` and `option netmask` (and optionally, `option gateway` and `option dns`).
+
+Example for a static IP configuration:
+```bash
+config interface 'wan'
+    option ifname 'eth0'
+    option proto 'static'
+    option ipaddr '192.168.1.2'
+    option netmask '255.255.255.0'
+    option gateway '192.168.1.1'
+    option dns '192.168.1.1'
+```
+
+To revert to DHCP:
+```bash
+config interface 'wan'
+    option ifname 'eth0'
+    option proto 'dhcp'
+```
+
+#### **Applying Changes in OpenWRT**
+
+After making changes to the `/etc/config/network` file:
+1. **Restart the Network Service** to apply the changes:
+   ```bash
+   /etc/init.d/network restart
+   ```
+
+2. **Test Connectivity** to ensure that your network configurations work as expected.
+
+These steps allow you to flexibly configure and manage network settings directly from the CLI, accommodating changes in network design or infrastructure requirements efficiently.