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- the VPC name,
- the subnet name, region and address, and
- optionally, an alternative MTU size (at the bottom of the window). The default MTU is 1460 bytes. If you want to dedicate an interface in this VPC to the emulator, this may cause problems as the default MTU size of the legacy guest systems is usually 1500 bytes. The interface dedicated to the emulator must not have an MTU smaller than the MTU used by the legacy guest system.
Click on Create at the bottom of the window to create the VPC.
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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 automatically configured with the appropriate MTU at start. For custom images set the MTU to a different value (e.g., 1500). In your instance (especially, if they do it does 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. For an MTU size of 1460, client applications that communicate with GCP instances over UDP should must have a maximum payload of 1432 bytes to avoid fragmentation.
In particular, ensure that the MTU used on any Linux interface dedicated to the emulator is not smaller than the MTU used by the legacy guest system. Failing to do so will cause network problems. For more information refer to the section Interface MTU Considerations in this guide.
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