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<p><strong>1.&nbsp;&nbsp; </strong><strong>Do ingress and egress security groups need to be configured at the same time when resources in the public cloud interact with the Internet?</strong></p> <p>When the Internet accesses cloud resources, the configuration of DNAT is required; when cloud resources access the Internet, the configuration of SNAT is required.</p> <p>&nbsp;</p> <p><strong>2.&nbsp;&nbsp; </strong><strong>When the cloud ECSs in different networks of the same VPC need to communicate with each other, do we only need to open ingress security groups?</strong></p> <p>When the DMZ accesses the SF, only ingress security groups in the SF need to be opened; however, when the SF accesses the DMZ, both egress security groups in the SF and ingress security groups in the DMZ need to be opened.</p> <p>&nbsp;</p> <p><strong>3.&nbsp;&nbsp; </strong><strong>Are the cloud ECSs in the same network of the same VPC interconnected by default?</strong></p> <p>Yes.</p> <p>&nbsp;</p> <p><strong>4.&nbsp;&nbsp; </strong><strong>When the cloud ECSs in different VPCs under the same tenant and in the same region need to be interconnected, do we only need to create ingress security groups?</strong></p> <p>To create Express Connects among different VPCs under the same tenant and in the same region, we need to open both egress and ingress security groups.</p> <p>&nbsp;</p> <p><strong>5.&nbsp;&nbsp; </strong><strong>When the cloud ECSs in VPCs under different tenants in the same region need to be interconnected, do we only need to create ingress security groups?</strong></p> <p>To create Express Connects among VPCs under different tenants in the same region, we need to open both egress and ingress security groups.</p>
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