Add tun.sh script and doc

scripts/tun.sh

@@ -6,19 +6,42 @@
 # VPNs as it allows the encapsulation of packets, creating a secure and private connection over the internet.
 #
 
+echo "Starting script to ensure /dev/net/tun exists and is configured properly."
+
 # Create the necessary file structure for /dev/net/tun if it does not already exist
 if [ ! -c /dev/net/tun ]; then
+    echo "/dev/net/tun does not exist. Creating the necessary file structure."
+
     # Create the /dev/net directory if it does not exist
     if [ ! -d /dev/net ]; then
+        echo "/dev/net directory does not exist. Creating it."
         mkdir -m 755 /dev/net
+    else
+        echo "/dev/net directory already exists."
     fi
+
     # Create the /dev/net/tun device node with major number 10 and minor number 200
+    echo "Creating /dev/net/tun device node."
     mknod /dev/net/tun c 10 200
+
     # Set the permissions for /dev/net/tun
+    echo "Setting permissions for /dev/net/tun."
     chmod 0755 /dev/net/tun
+else
+    echo "/dev/net/tun already exists."
 fi
 
 # Load the tun module if it is not already loaded
 if ! lsmod | grep -q "^tun\s"; then
+    echo "tun module is not loaded. Loading it now."
     insmod /lib/modules/tun.ko
+    if [ $? -eq 0 ]; then
+        echo "tun module loaded successfully."
+    else
+        echo "Failed to load tun module."
+    fi
+else
+    echo "tun module is already loaded."
 fi
+
+echo "Script execution completed."