What are the benefits and drawbacks of using bridged networking for guest VMs?

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Bridged networking is a common way to connect guest VMs to the host network and the internet. It allows the guest VMs to appear as separate devices on the same network as the host, with their own IP addresses and MAC addresses. But is it always the best option for your virtualization needs? In this article, we will explore the benefits and drawbacks of using bridged networking for guest VMs, and compare it to other networking modes.

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1 Benefits of bridged networking

One of the main advantages of bridged networking is that it simplifies the communication between guest VMs and other devices on the host network. You can use standard network protocols and tools to access, share, and transfer data between the guest VMs and the host, or other guest VMs on the same or different hosts. You can also use the same security and firewall settings as the host network, without having to configure additional rules or ports. Bridged networking also enables the guest VMs to access the internet directly, without relying on the host's NAT or proxy settings.

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Moorshidee Bin Abdul Kassim

IT Support | From Tech problem to sustainable Tech Solution | BSBA, BBA, CISA, CISM
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Bridged networking for guest VMs allows them to connect directly to the physical network, providing full external access and simplifying configurations, especially in environments where VMs need to act like physical machines. However, it introduces security risks as VMs are exposed to the external network, increases IP management complexity, and lacks scalability for large deployments. Alternatives like NAT and private networking offer better security and scalability, especially when direct external access isn't required. Tools like VMware, Hyper-V, Wireshark, and IPAM systems help manage and monitor bridged networking, while success is measured through network performance, security monitoring, and resource utilization.

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2 Drawbacks of bridged networking

However, bridged networking also has some disadvantages that you should consider before using it. One of the main drawbacks is that it exposes the guest VMs to the same risks and vulnerabilities as the host network. If the host network is compromised, the guest VMs could also be attacked or infected by malware. You also need to ensure that the guest VMs have unique IP and MAC addresses, and that they do not conflict with the host network's DHCP or DNS settings. Otherwise, you could face network errors or performance issues. Bridged networking also consumes more bandwidth and resources than other networking modes, as it requires a separate network interface card (NIC) for each guest VM.

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3 Alternatives to bridged networking

Depending on your virtualization goals and requirements, you may want to use a different networking mode for your guest VMs. NAT networking allows the guest VMs to share the host's IP address and internet connection while isolating them from the host network. Host-only networking creates a private network between the guest VMs and the host, while internal networking creates a private network between the guest VMs only. Each of these modes has its own advantages, such as saving IP addresses or bandwidth, creating secure environments for testing or training purposes, or creating network clusters or distributed systems that do not need to access the host or the internet.

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4 Choosing the best networking mode

When determining the best networking mode for your guest VMs, there is no one-size-fits-all answer. Consider factors such as the purpose and function of the VMs, the level of security and isolation required, the type and amount of network traffic expected, the availability and configuration of the host network and internet, and the compatibility and support of the virtualization software and guest operating systems. Evaluate your options carefully and weigh their pros and cons. You may also want to test different modes to monitor their performance, or use different modes for different guest VMs depending on their roles and needs.

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5 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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What are the benefits and drawbacks of using bridged networking for guest VMs?

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1 Benefits of bridged networking

2 Drawbacks of bridged networking

3 Alternatives to bridged networking

4 Choosing the best networking mode

5 Here’s what else to consider

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