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What Should I Do If My ECS Fails to Access a Server on the Public Network Through a Public NAT Gateway? What Are the Relationships and Differences Between the CIDR Blocks in a NAT Gateway and in an SNAT Rule?
Troubleshooting an Unreachable ECS Port Common Ports Used by ECSs More Operating Systems Why Is My Windows ECS Muted? How Can I Install GUI on a Linux ECS?
What Should I Do If My ECS Fails to Access a Server on the Public Network Through a Public NAT Gateway? TCP connection may fail when an ECS accesses a server on the public network through an SNAT rule.
An ECS is an instance running in a VPC and uses a public NAT gateway to access the Internet. Parent topic: Public NAT Gateways
Public NAT Gateways What Is the Relationship Between a VPC, Public NAT Gateway, EIP Bandwidth, and ECS? How Does a Public NAT Gateway Offer High Availability? Which Ports Cannot Be Accessed? What Are the Differences Between Using a Public NAT Gateway and Using an EIP for an ECS?
Using a Private NAT Gateway and Direct Connect to Enable Communications Between a VPC and an On-premises Data Center Scenarios When an ECS in a VPC needs to communicate with an on-premises data center through a Direct Connect connection, the private IP address of the ECS needs to
However, assigning a public IP address to each ECS consumes already-limited IPv4 addresses, incurs additional costs, and may increase the attack surface in a virtual environment. Enabling multiple ECSs to share a public IP address is preferable and more practical.
If both DNAT and EIP are configured for an ECS, inbound traffic will be forwarded by the EIP configured for the DNAT rule or the EIP directly bound to the ECS, which is determined by the client user.
On ECS 02, ping the EIP (120.46.131.153) to check whether ECS 01 on the private network can be accessed by ECS 02 on the public network through the NAT gateway. Figure 3 Verification result
Ping the gateway (8.8.8.8) from the ECS in CN East-Shanghai1.
Creating an ECS Under Compute, select Elastic Cloud Server. On the Elastic Cloud Server page displayed, click Buy ECS. Based on Table 1, configure basic information about the ECS of the regulatory agency and click Next: Configure Network. Billing Mode: Select Pay-per-use.
On the Elastic Cloud Server page displayed, click Create ECS. Based on Table 1, configure basic information about the ECS of department A and click Next: Configure Network. Billing Mode: Select Pay-per-use. Region: Select CN-Hong Kong.
On the Elastic Cloud Server page, click the name of the ECS. Click the Security Groups tab and view security group rules. Check whether you have configured inbound and outbound rules to allow traffic to and from the ECS port. If yes, check the next item.
Public services, such as Elastic Cloud Server (ECS), Elastic Volume Service (EVS), Object Storage Service (OBS), Virtual Private Cloud (VPC), Elastic IP (EIP), and Image Management Service (IMS), are shared within the same region.
If you set Instance Type to Server and select an ECS, you also need to obtain the ECS ReadOnlyAccess permissions or the fine-grained permissions for actions ecs:cloudServers:get and ecs:cloudServers:list. For details, see the Elastic Cloud Server API Reference.
You can bind an EIP to an ECS in your subnet to enable the ECS to communicate with the Internet. Each EIP can be used by only one ECS at a time. To enable servers in a VPC, regardless of if they are in the same AZ, to share an EIP, use a public NAT gateway.
Enabling Private Networks to Access the Internet Using Cloud Connect and SNAT Elastic Cloud Server (ECS) ECSs can use a public NAT gateway to communicate with the Internet.
Security groups operate at the ECS level, whereas network ACLs operate at the subnet level. You can use network ACLs together with security groups to implement access control that is both comprehensive and fine-grained.
You can run the netstat command on an ECS to obtain the number of connections in the ESTABLISHED state, but this number reflects only the number of connections established to this ECS, and due to the impact of connection timeout, connection reuse, and other issues, this number may
In the ECS list, click the name of the ECS for which you will check the security group rules. Click the Security Groups tab and view security group rules. Check whether you have configured inbound and outbound rules to allow traffic to and from the ECS port.
