Add docs/tech_docs/OPENwrt.md

docs/tech_docs/OPENwrt.md

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+To set up a Proxmox container (CT) with OpenWRT using the `pct create` command and configure the firewall to allow SSH and HTTPS access on the WAN interface (`eth1`), let's compile a comprehensive guide including the commands for creating the container and the necessary firewall configuration within OpenWRT.
+
+### Container Creation with Proxmox
+
+First, let's clarify the Proxmox command for creating the container:
+
+```bash
+pct create 106 /var/lib/vz/template/cache/rootfs.tar.xz --unprivileged 1 --ostype unmanaged --hostname openwrt --storage local-lvm \
+--net0 name=eth0,bridge=vmbr0,firewall=1,gw=192.168.1.1,ip=192.168.1.2/24 \
+--net1 name=eth1,bridge=vmbr1,firewall=1 \
+--net2 name=eth2,bridge=vmbr2,firewall=1
+```
+
+This command creates an unprivileged container with ID 106, using an OpenWRT root filesystem. It configures three network interfaces:
+
+- **eth0**: Main LAN interface with a static IP and gateway.
+- **eth1**: WAN interface on `vmbr1`, which will be used to allow external SSH and HTTPS access.
+- **eth2**: Additional network interface.
+
+### Firewall Configuration in OpenWRT
+
+For the OpenWRT container to allow SSH (port 22) and HTTPS (port 443) on `eth1`, you must ensure that `eth1` is treated as the WAN interface in OpenWRT's network and firewall settings. Here's how to set up the necessary firewall rules within the OpenWRT system:
+
+1. **Define Network Interfaces in OpenWRT**:
+    Ensure `eth1` is configured as the WAN interface in `/etc/config/network`. This might look something like this:
+
+    ```bash
+    config interface 'wan'
+        option ifname 'eth1'
+        option proto 'dhcp'
+    ```
+
+2. **Update Firewall Settings**:
+    In `/etc/config/firewall`, you should add rules to allow SSH and HTTPS. These rules need to specify that they apply to traffic coming in on `eth1` (which should be associated with the `wan` zone). Here’s how you would configure the firewall:
+
+    ```bash
+    config zone
+        option name 'wan'
+        list network 'wan'
+        option input 'REJECT'
+        option output 'ACCEPT'
+        option forward 'REJECT'
+        option masq '1'
+        option mtu_fix '1'
+
+    config rule
+        option name 'Allow-SSH'
+        option src 'wan'
+        option dest_port '22'
+        option proto 'tcp'
+        option target 'ACCEPT'
+
+    config rule
+        option name 'Allow-HTTPS'
+        option src 'wan'
+        option dest_port '443'
+        option proto 'tcp'
+        option target 'ACCEPT'
+    ```
+
+### Applying the Configuration
+After editing the configuration files, apply the changes:
+- Restart the network service: `/etc/init.d/network restart`
+- Reload the firewall: `/etc/init.d/firewall restart`
+
+### Final Considerations
+- **Security**: Ensure you have set strong passwords and consider using key-based authentication for SSH.
+- **Testing**: After setting up, test the accessibility of SSH and HTTPS from outside your LAN to confirm the firewall rules are working as expected.
+- **Backup Configurations**: Always keep backups of your configurations before making significant changes.
+
+This setup will configure your Proxmox container with OpenWRT to allow SSH and HTTPS traffic on `eth1`, ensuring remote management capabilities from the WAN side.