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- What's New
- Function Overview
- Service Overview
- Billing
-
Getting Started
- Using a Public NAT Gateway to Enable Servers to Share One or More EIPs to Access the Internet
- Using a Public NAT Gateway to Enable Servers to Be Accessed by the Internet
- Using a Private NAT Gateway to Connect Cloud and On-premises Networks
- Using Multiple Public NAT Gateways Together in Performance-Demanding Scenarios
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User Guide
- Public NAT Gateways
- Private NAT Gateways
- Permissions Management
- Tag Management
- Managing Quotas
- Monitoring
- Auditing
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Best Practices
- Enabling Private Networks to Access the Internet Using a Cloud Connection and SNAT
- Using a Public NAT Gateway and Direct Connect to Accelerate Internet Access
- Using a Private NAT Gateway and Direct Connect to Enable Communications Between a VPC and an On-premises Data Center
- Using a Public NAT Gateway and VPC Peering to Enable Communications Between VPCs and the Internet
- Preserving Your Network with NAT Gateways During Cloud Migration
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API Reference
- Before You Start
- API Overview
- Calling APIs
- APIs of Public NAT Gateways
- APIs for Private NAT Gateways
- Application Examples
- Permissions Policies and Supported Actions
- Appendixes
- Out-of-Date APIs
- SDK Reference
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FAQs
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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?
- What Should I Do If I Fail to Access the Internet Through a Public NAT Gateway?
- Can I Change the VPC for a Public NAT Gateway?
- Does Public NAT Gateway Support IPv6 Addresses?
- What Security Policies Can I Configure to Implement Access Control If I Use a Public NAT Gateway?
- What Can I Do If Connection Between My Servers and the Internet Fails After I Add SNAT and DNAT Rules?
- Can a Public NAT Gateway Limit the Bandwidth of a Server?
- What Can I Do If the Number of Lost Packets of a Public NAT Gateway Exceeds the Threshold (or EIP Port Allocation Exceeds the Threshold)?
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Private NAT Gateways
- How Do I Troubleshoot a Network Failure After a Private NAT Gateway Is Configured?
- How Many Private NAT Gateways Can I Buy in a VPC?
- Can I Increase the Numbers of SNAT and DNAT Rules Supported by a Private NAT Gateway?
- Can Private NAT Gateways Translate On-premises IP Addresses Connected to the Cloud Through Direct Connect?
- What Are the Differences Between Private NAT Gateways and Public NAT Gateways?
- Can a Private NAT Gateway Be Used Across Accounts?
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SNAT Rules
- Why Do I Need SNAT?
- What Are SNAT Connections?
- What Is the Bandwidth of a Public NAT Gateway That Is Used by Servers to Access the Internet? How Do I Configure the Bandwidth?
- How Do I Resolve Packet Loss or Connection Failure Issues When Using a NAT Gateway?
- 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?
- DNAT Rules
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Public NAT Gateways
- Videos
- Glossary
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More Documents
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User Guide (ME-Abu Dhabi Region)
- Overview
- Getting Started
- Managing NAT Gateways
- Managing SNAT Rules
- Managing DNAT Rules
- Monitoring Management
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FAQs
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NAT Gateway
- What Is the Relationship Between VPC, NAT Gateway, EIP Bandwidth, and ECS?
- How Does A NAT Gateway Offer High Availability?
- Which Ports Cannot Be Accessed?
- What Can I Do If I Fail to Access the Internet Through the NAT Gateway?
- Can I Change the VPC for a NAT Gateway After It Is Created?
- What Is the Quota of the NAT Gateway?
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SNAT
- Why SNAT Is Used?
- What Are SNAT Connections?
- What Is the Bandwidth of the NAT Gateway When a Server Accesses the Internet Through the NAT Gateway? Where Can I Configure the Bandwidth?
- How Do I Resolve Packet Loss or Connection Failure Issues When Using a NAT Gateway?
- What Are the Relationships and Differences Between the CIDR Blocks in a NAT Gateway and in an SNAT Rule?
- DNAT
-
NAT Gateway
- Change History
- API Reference (ME-Abu Dhabi Region)
-
User Guide (Paris Region)
- Overview
-
Getting Started
- Allowing a Private Network to Access the Internet Using SNAT
- Allowing Internet Users to Access a Service in a Private Network Using DNAT
- Allowing On-Premises Servers to Communicate with the Internet
- Using Private NAT Gateways to Enable Communications Between Cloud and On-premises Networks
- Using Multiple Public NAT Gateways Together in Performance-Demanding Scenarios
- Public NAT Gateways
- Private NAT Gateways
- Permissions Management
- Monitoring
-
FAQs
-
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 NAT Gateway and Using an EIP for an ECS?
- What Should I Do If I Fail to Access the Internet Through a NAT Gateway?
- Can I Change the VPC for a NAT Gateway?
- What Is the Quota of the NAT Gateway?
- Can I Update NAT Gateways and SNAT Rules?
- Does NAT Gateway Support IPv6 Addresses?
- What Security Policies Can I Configure to Implement Access Control If I Use a NAT Gateway?
- What Can I Do If Connection Between My Servers and the Internet Fails After I Add SNAT and DNAT Rules?
-
Private NAT Gateways
- How Do I Troubleshoot a Network Failure After a Private NAT Gateway Is Configured?
- How Many Private NAT Gateways Can I Create in a VPC?
- Can I Increase the Numbers of SNAT and DNAT Rules Supported by a Private NAT Gateway?
- Can an SNAT Rule and a DNAT Rule of a Private NAT Gateway Share the Same Transit IP Address?
- Can Private NAT Gateways Translate On-premises IP Addresses Connected to the Cloud Through Direct Connect?
- What Are the Differences Between Private NAT Gateways and Public NAT Gateways?
- Can a Private NAT Gateway Be Used Across ?
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SNAT Rules
- Why Do I Need SNAT?
- What Are SNAT Connections?
- What Is the Bandwidth of a NAT Gateway That Is Used by Servers to Access the Internet? How Do I Configure the Bandwidth?
- How Do I Resolve Packet Loss or Connection Failure Issues When Using a NAT Gateway?
- What Should I Do If My ECS Fails to Access a Server on the Public Network Through a NAT Gateway?
- What Are the Relationships and Differences Between the CIDR Blocks in a NAT Gateway and in an SNAT Rule?
- DNAT Rules
-
Public NAT Gateways
- Change History
- API Reference (Paris Region)
-
User Guide (Kuala Lumpur Region)
- Overview
- Getting Started
- Managing NAT Gateways
- Managing SNAT Rules
- Managing DNAT Rules
- Permissions Management
- Monitoring Management
-
FAQs
- NAT Gateway
-
SNAT
- Why Is SNAT Used?
- What Are SNAT Connections?
- What Is the Bandwidth of the NAT Gateway When a Server Accesses the Internet Through the NAT Gateway? Where Can I Configure the Bandwidth?
- How Do I Resolve Packet Loss or Connection Failure Issues When Using a NAT Gateway?
- What Are the Relationships and Differences Between the CIDR Blocks in a NAT Gateway and in an SNAT Rule?
- DNAT
- Change History
- API Reference (Kuala Lumpur Region)
-
User Guide (Ankara Region)
- Service Overview
- Getting Started
- Public NAT Gateways
- Private NAT Gateways
- Permissions Management
- Monitoring
-
FAQs
- Public NAT Gateways
-
Private NAT Gateways
- How Do I Troubleshoot a Network Failure After a Private NAT Gateway Is Configured?
- How Many Private NAT Gateways Can I Create in a VPC?
- Can Private NAT Gateways Translate On-premises IP Addresses Connected to the Cloud Through Direct Connect?
- What Are the Differences Between Private NAT Gateways and Public NAT Gateways?
- Can a Private NAT Gateway Be Used Across Accounts?
- SNAT Rules
- DNAT Rules
- Change History
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API Reference (Ankara Region)
- Before You Start
- API Overview
- Calling APIs
- APIs for Public NAT Gateways
- Private Nat API
- Permissions Policies and Supported Actions
- Common Parameters
- Change History
-
User Guide (ME-Abu Dhabi Region)
- General Reference
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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 be translated into a private IP address trusted by the on-premises data center.
Solution Architecture
- A Direct Connect connection is used to connect the on-premises data center to the transit VPC.
- A private NAT gateway is configured to translate the private IP address of the ECS in the service VPC into a transit IP address (private IP address trusted by the on-premises data center) in the transit VPC.
Figure 1 Networking diagram
Solution Advantages
In a hybrid cloud scenario, the private IP addresses of ECSs in the VPC need to be mapped to those trusted by the on-premises data center to meet security compliance requirements.
Constraints and Limitations
- The CIDR block of your on-premises data center cannot overlap with the subnet CIDR block of the transit VPC and the CIDR block of the service VPC, or your on-premises data center will be unable to communicate with the service VPC.
- You need to define a CIDR block in the transit VPC that you can map private IP addresses in the service VPC to. Generally, you either use a private CIDR block or use private IP address trusted by your on-premises data center.
Resource and Cost Planning
Resource |
Resource Name |
Description |
Quantity |
---|---|---|---|
VPC |
VPC-Test01 |
The service VPC: 192.168.0.0/24 |
1 |
VPC-Test02 |
The transit VPC: 10.1.0.0/24 |
1 |
|
NAT gateway |
NAT-Private-Test |
A private NAT gateway purchased and deployed in VPC-Test01 |
1 |
NAT-Ext-Sub-IP-Test |
The transit IP address. The transit VPC is VPC-Test02, and transit IP address is 10.1.0.10 |
1 |
|
Direct Connect connection |
DC-Test |
A Direct Connect connection linking the on-premises data center to the transit VPC |
1 |
ECS |
ECS-Test |
An ECS purchased and deployed in VPC-Test01. Private IP address: 192.168.0.10 |
1 |
On-premises data center |
IDC-Test |
CIDR block: 10.0.0.0/24; private IP address of the server: 10.0.0.62 |
1 |
- The private IP address (192.168.0.10) of the ECS is mapped to the private IP address (10.1.0.10) trusted by the on-premises data center through the private NAT gateway.
- The VPC, NAT gateway, Direct Connect connection, and ECS must be in the same region.
Tasks
Procedure
- Create a service VPC and a transit VPC.
For detailed operations, see Creating a VPC.
- Configure a Direct Connect connection.
Create a Direct Connect connection between the on-premises data center and the transit VPC. For details, see Overview.
- Buy a private NAT gateway.
- Buy a private NAT gateway in the specified region and select a service VPC.
- Assign a transit IP address by setting Transit VPC to VPC-Test02, selecting Manual for Transit IP Address, and setting IP address to 10.1.0.10.
- On the SNAT Rules tab of the purchased private NAT gateway, click Add SNAT Rule and set Subnet to 192.168.0.0/24, the service subnet with the IP addresses that need to be mapped to those of the on-premises data center. Set Transit IP Address to the address configured in the previous step.
- Add a route pointing to the private NAT gateway in the service VPC. Set Destination to 10.0.0.0/24.
Figure 2 Adding a route
- Add an inbound security group rule for the on-premises server (private IP address: 10.0.0.62).
Figure 3 Adding an inbound security group rule
Verification
After the configuration is complete, test the network connectivity.
Log in to ECS (ECS-Test) in the service VPC and ping the private IP address (10.0.0.62) of the on-premises data center to confirm the configuration was successful.
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