Intranet

Last Updated: Mar 24, 2017

Currently, Alibaba Cloud servers communicate through the intranet. They use a gigabit of shared bandwidth for non I/O optimized instances, and 10 gigabits of shared bandwidth for I/O Optimized instances, with no special restrictions. However, because this is a shared network, the bandwidth speed may fluctuate.

If you need to transmit data between two ECS instances in the same region, you should use an intranet connection. Intranet connections can also be used to connect RDS, Server Load Balancer, and OSS instances. The internet speed of these instances is based on a gigabit shared bandwidth environment. At present, you can also use a direct intranet connection to link RDS, Server Load Balancer, and OSS instances with ECS instances in the same region.

For ECS instances in the intranet:

  • For instances of Classic network:

    • Intranet communication is by default used only for instances in the same security group of the same account in the same region.
    • An intranet communication can also be used for instances in the same security group of the same account and region but of different zones, even if the intranet IP addresses are in different network segments.
    • For intranet communication between instances in the same region but of different accounts, you can use security groups. For more information, see Application scenarios of security group from ECS User Guide.
  • For instances of VPC network:

    • Intranet communication is by default used only for instances in the same security group of the same account and same VPC network in the same region.
    • An intranet communication can also be used for instances of the same account and region but of different VPC networks only if you use ExpressConnect to authorize their intranet communication. For more information, see Application scenarios from Product Introduction to ExpressConnect.
  • The intranet IP addresses of instances cannot be modified or changed.

  • Intranet and Internet addresses of instances do not support virtual IP (VIP) configuration.

  • Instances of different network types cannot communicate with each other in intranet.

Thank you! We've received your feedback.