Notes

Virtual Machines

This is the page that has some info about VMs and their utils*

Network Connection Options in VM

When creating a Virtual Machine (VM), you typically encounter four main network connection options. These determine how the VM communicates with the host machine and external networks. Here’s an explanation of each:

1. Bridged Networking

• How it Works: The VM acts as a separate physical machine on the same network as the host. It gets its own IP address from the network (e.g., DHCP server).
• Use Case: Ideal for scenarios where the VM needs direct access to the external network, like web servers or file sharing.
• Pros:
  • VM is fully accessible to other devices on the same network.
  • Can use network services like DHCP or DNS directly.
• Cons:
  • Requires proper network permissions.
  • Might expose the VM to external threats.

2. NAT (Network Address Translation)

• How it Works: The VM shares the host’s IP address and uses NAT to communicate with external networks. The VM is on an internal private network.
• Use Case: Suitable for general internet access without exposing the VM to the local network.
• Pros:
  • Easy setup with minimal configuration.
  • Provides some isolation from the external network.
• Cons:
  • VM cannot be directly accessed from the external network.
  • Port forwarding is needed for specific services.

3. Host-Only Networking

• How it Works: The VM can only communicate with the host machine and other VMs on the same host. No access to the external network.
• Use Case: Useful for testing, debugging, or secure development environments without internet or external access.
• Pros:
  • Provides complete isolation from external networks.
  • Useful for private communication between host and VMs.
• Cons:
  • No internet access or communication with external networks.

4. Custom/Private Network or Internal Networking

• How it Works: Creates a private internal network where VMs can communicate with each other but not with the host or external networks.
• Use Case: Best for multi-VM setups where inter-VM communication is needed, like simulating clusters or complex systems.
• Pros:
  • Isolated environment for VM-to-VM communication.
  • Does not interfere with external networks.
• Cons:
  • No communication with the host or internet.