When you create a virtual machine through the portal, the portal creates a network interface with default settings and attaches the network interface to the VM for you. You can't use the portal to add existing network interfaces to a new VM, or to create a VM with multiple network interfaces. You can do both by using the CLI or PowerShell. Be sure to familiarize yourself with the [constraints](#constraints). If you create a VM with multiple network interfaces, you must also configure the operating system to use them properly after you create the VM. Learn how to configure [Linux](/azure/virtual-machines/linux/multiple-nics#configure-guest-os-for-multiple-nics) or [Windows](/azure/virtual-machines/windows/multiple-nics#configure-guest-os-for-multiple-nics) for multiple network interfaces.
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