What is an internal network

Subnets in a VPC are on the Layer 3 network. An internal network is a Layer 2 network that can manage network plane on an ECS and provide the IP address management and DNS service. All IP addresses of ECSs on a subnet of an internal network belong to this subnet. By default, all ECSs on the subnets of the same internal network can communicate with each other over Layer 2. However, the ECSs cannot perform Layer 3 communication with each other through the internal network. A subnet in an internal network can be any network segment.

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