What is the difference between "network adapter" and "legacy network adapter" in hyper-V?

There are two types of network adapters in the hyper-V virtual network. The first is "network adapter" and the other is "legacy network adapter ".

The difference between the two is very simple.

• Before you start PXE or install integrate components, your vm OS needs to access the network.Legacy Network Adapter.
• After you install integrate components (yes, this component contains the false drivers required by the network adapter to work normally), you needNetwork adapter.

Therefore, if you want to ensure that the virtual machine can access the network during installation, you should use "legacy network adapter"

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After the OS is installed, you should add integrated components. use the hyper-V tool to insert the integrated components ISO image, install the integrated components, and then restart. the simplest method is to use the legacy network adapter throughout the installation phase, add the integrated components, shut down, edit the virtual machine configuration, remove the legacy network adapter, and replace it with a "network adapter ".

You may want to make sure that the boot sequence is correct. Simply do this:

1. Create a VM in hyper-V and select "Install the operating system from the network". Do not start the VM.
2. Edit the machine so that you have 2 or 4 CPUs (this can only be performed on some 64-bit win2k8)
3. Modify the startup sequence to meet your needs.
4. Start the machine, run the installation, end the installation, and then install "integrated components"
5. Disable the VM, edit the VM configuration, remove "legacy network adapter", and add a "network adapter ".

You may ask a question: "Why should I replace it? ", The answer is very simple. Legacy network adaapter is a little slow because it runs in the working process of Ring 3 of parent partition, while" network adapter "uses the new high-speed vmbus.

Note: "the new server solutions" is not supported by hyper-V and may be supported in the future.

NOTE 2: If you choose to install from the Network (when creating a virtual machine), hyper-V selects the legacy Network Adapter. In other cases, it selects the network adapter.

Translated from:

Hyper-V: the differences between a "Network Adapter" and the "legacy network adapter"

Http://itbloggen.se/cs/blogs/micke/archive/2008/01/22/hyper-v-the-differences-between-a-the-network-adapter-and-the-legacy-network-adapter.aspx