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<p>VPCs are isolated from each other and cannot be connected to each other. If the tenants have multiple VPCs and they want to connect different VPCs or connect different VPCs that belong to different tenants, they need to create an express connect and then configure a security group.</p> <p>The In and Out of cloud resources between VPCs are blocked by default. If the tenant wants to connect different VPCs, the security groups in both directions, In and Out, need to be configured.</p> <p>This article uses the DMZ network domain of VPC-1 and SF network domain of VPC-2 as an example to show how to realize two VPCs&rsquo; intercommunication by using express connect and security group.</p>
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