Does DCS Support Cross-VPC Access?

Cross-VPC means the client and the instance are not in the same VPC.

The following assumes that public access is disabled for a DCS instance. Generally, VPCs are isolated from each other and an ECS cannot access a DCS instance that belongs to a different VPC from the ECS.

You can establish VPC peering connections to allow the ECS to access the DCS instance across VPCs.

When using VPC peering connections to access DCS instances across VPCs, adhere to the following rules:

• If CIDR Blocks 172.16.0.0/12 to 172.16.0.0/24 are used during DCS instance creation, the client cannot be in any of the following CIDR Blocks: 192.168.1.0/24, 192.168.2.0/24, and 192.168.3.0/24.
• If CIDR Blocks 192.168.0.0/16 to 192.168.0.0/24 are used during DCS instance creation, the client cannot be in any of the following CIDR Blocks: 172.31.1.0/24, 172.31.2.0/24, and 172.31.3.0/24.
• If CIDR Blocks 10.0.0.0/8 to 10.0.0.0/24 are used during DCS instance creation, the client cannot be in any of the following CIDR Blocks: 172.31.1.0/24, 172.31.2.0/24, and 172.31.3.0/24.

For more information on how to create and use VPC peering connections, see VPC Peering Connection.