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After restarting the network (systemctl restart network), the configuration as defined in the ifcfg-files should be set for the interfaces.

Additional GCP-specific Information

IP Interface Netmask

By default, the netmask configured for an VM instance is /32 and only ARP requests for the default gateway are answered by the Google metadata server.

When providing a dedicated NIC to the Solaris guest system, that is, the internal IP address of the interface is not configured on the Linux level, but on the Solaris level, the netmask has to be set to a value that includes the default gateway (e.g., /24). Otherwise, Solaris will return an error when setting the default gateway (network unreachable).

Routing between VPCs

If a VM instance has more than one NIC, each NIC must be in a different VPC. Routing between VPCs is not enabled by default. It has to be enabled through a mutual VPC peering configuration as shown in the sample below:

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The example shows one rule for each routing direction between the two VPCs.

If this is not enabled, host and guest system can only communicate via the external IP addresses, not via the internal IP addresses.

Network Interface MTU

The VPC network has a maximum transmission unit (MTU) of 1460 bytes. Interfaces should be configured to this value to avoid the increased latency and packet overhead caused by fragmentation. Client applications that communicate with GCP instances over UDP should have a maximum payload of 1432 bytes to avoid fragmentation.