added multiple new features and fixing of network issues

vm-tool-setup.sh

@@ -1,6 +1,52 @@
 #!/bin/bash
+
+set -euo pipefail
+
+echo "=== [1/5] Updating system and installing tools ==="
 sudo apt update
 sudo apt -y upgrade
-sudo apt install -y qemu-guest-agent util-linux haveged 
+sudo apt install -y qemu-guest-agent util-linux haveged ethtool
-sudo fstrim -av 
+
+echo "=== [2/5] Enabling qemu-guest-agent ==="
 sudo systemctl enable --now qemu-guest-agent
+
+echo "=== [3/5] Trimming filesystems ==="
+sudo fstrim -av || true
+
+echo "=== [4/5] Detecting VM network interfaces ==="
+NIC_LIST=$(ls /sys/class/net | grep -Ev '^(lo|docker|br|vmbr|tap|veth)' | xargs)
+
+echo "VM NICs detected: $NIC_LIST"
+
+echo "=== [5/5] Creating persistent systemd service to disable offloads ==="
+SERVICE_FILE="/etc/systemd/system/disable-vm-nic-offloads.service"
+
+sudo tee "$SERVICE_FILE" > /dev/null <<EOF
+[Unit]
+Description=Disable all VM NIC offloads at boot
+After=network.target
+
+[Service]
+Type=oneshot
+ExecStart=/bin/bash -c '
+$(for nic in $NIC_LIST; do
+    echo "/usr/sbin/ethtool -K $nic tx off rx off tso off gso off gro off;"
+    echo "/sbin/ip link set $nic txqueuelen 10000;"
+done)
+'
+RemainAfterExit=yes
+
+[Install]
+WantedBy=multi-user.target
+EOF
+
+echo "=== Enabling and starting NIC offload disable service ==="
+sudo systemctl daemon-reload
+sudo systemctl enable --now disable-vm-nic-offloads.service
+
+echo "=== ✅ VM NIC setup complete ==="
+for nic in $NIC_LIST; do
+    echo "--- $nic ---"
+    ethtool -k "$nic" | grep -E 'segmentation|offload|scatter|checksum'
+    ip link show "$nic" | grep txqueuelen
+done