Bash script for Proxmox network diagnostics. Here are the key features:

1. Interactive Menu System:

   • Main menu with multiple diagnostic options
   • Sub-menus for detailed testing of specific components
   • Clear color-coded output for better readability

2. Major Functions:

   • DNS resolution testing
   • Port testing (specific or common Proxmox ports)
   • Network interface inspection
   • Connectivity testing (ping, MTR, bandwidth)
   • Network card diagnostics
   • Firewall status checking

3. Additional Features:

   • Root privilege check
   • Automatic installation of required tools if missing
   • Color-coded output for better visibility
   • Error handling for various scenarios
   • Support for both automated and interactive testing

To use the script:

1. Save it to a file (e.g., proxmox_network_diagnostic.sh)
2. Make it executable: chmod +x proxmox_network_diagnostic.sh
3. Run it as root: sudo ./proxmox_network_diagnostic.sh