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  • Interfaces can only be added during instance creation.
  • Each network interface configured in a single instance must be attached to a different VPC network.
  • The additional VPC networks that the multiple interfaces will attach to must exist before an instance is created. See Using VPC Networks for instructions on creating additional VPC networks.
  • You cannot delete a network interface without deleting the instance.
  • IP forwarding can only be enabled when the instance is created.
  • A VPC network has a default transmission unit (MTU) of 1460 bytes for Linux images and Windows Server images. During the creation of a VPC you can choose an alternative MTU size of 1500. Google-provided Linux system images are already are automatically configured with the appropriate MTU at start. For custom images (especially, if they do not rely on DHCP), set the MTU to the same value as configured for the VPC to avoid the increased latency and packet overhead caused by fragmentation, or even connectivity problems.

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