If you choose to use the "Realtek" network card you will see a limit of 100Mbps. You should use the Intel Pro or Virtio drivers for 1Gbps connectivity.
If you're running a Windows KVM you should use the "Intel Pro/1000", this can be selected from the SolusVM control panel.
If you're going to be running other Linux distros, with the excteption of Ubuntu, we recommend the use the "Virtio" network card.
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