Compute
Elastic Cloud Server
Huawei Cloud Flexus
Bare Metal Server
Auto Scaling
Image Management Service
Dedicated Host
FunctionGraph
Cloud Phone Host
Huawei Cloud EulerOS
Networking
Virtual Private Cloud
Elastic IP
Elastic Load Balance
NAT Gateway
Direct Connect
Virtual Private Network
VPC Endpoint
Cloud Connect
Enterprise Router
Enterprise Switch
Global Accelerator
Management & Governance
Cloud Eye
Identity and Access Management
Cloud Trace Service
Resource Formation Service
Tag Management Service
Log Tank Service
Config
OneAccess
Resource Access Manager
Simple Message Notification
Application Performance Management
Application Operations Management
Organizations
Optimization Advisor
IAM Identity Center
Cloud Operations Center
Resource Governance Center
Migration
Server Migration Service
Object Storage Migration Service
Cloud Data Migration
Migration Center
Cloud Ecosystem
KooGallery
Partner Center
User Support
My Account
Billing Center
Cost Center
Resource Center
Enterprise Management
Service Tickets
HUAWEI CLOUD (International) FAQs
ICP Filing
Support Plans
My Credentials
Customer Operation Capabilities
Partner Support Plans
Professional Services
Analytics
MapReduce Service
Data Lake Insight
CloudTable Service
Cloud Search Service
Data Lake Visualization
Data Ingestion Service
GaussDB(DWS)
DataArts Studio
Data Lake Factory
DataArts Lake Formation
IoT
IoT Device Access
Others
Product Pricing Details
System Permissions
Console Quick Start
Common FAQs
Instructions for Associating with a HUAWEI CLOUD Partner
Message Center
Security & Compliance
Security Technologies and Applications
Web Application Firewall
Host Security Service
Cloud Firewall
SecMaster
Anti-DDoS Service
Data Encryption Workshop
Database Security Service
Cloud Bastion Host
Data Security Center
Cloud Certificate Manager
Edge Security
Managed Threat Detection
Blockchain
Blockchain Service
Web3 Node Engine Service
Media Services
Media Processing Center
Video On Demand
Live
SparkRTC
MetaStudio
Storage
Object Storage Service
Elastic Volume Service
Cloud Backup and Recovery
Storage Disaster Recovery Service
Scalable File Service Turbo
Scalable File Service
Volume Backup Service
Cloud Server Backup Service
Data Express Service
Dedicated Distributed Storage Service
Containers
Cloud Container Engine
SoftWare Repository for Container
Application Service Mesh
Ubiquitous Cloud Native Service
Cloud Container Instance
Databases
Relational Database Service
Document Database Service
Data Admin Service
Data Replication Service
GeminiDB
GaussDB
Distributed Database Middleware
Database and Application Migration UGO
TaurusDB
Middleware
Distributed Cache Service
API Gateway
Distributed Message Service for Kafka
Distributed Message Service for RabbitMQ
Distributed Message Service for RocketMQ
Cloud Service Engine
Multi-Site High Availability Service
EventGrid
Dedicated Cloud
Dedicated Computing Cluster
Business Applications
Workspace
ROMA Connect
Message & SMS
Domain Name Service
Edge Data Center Management
Meeting
AI
Face Recognition Service
Graph Engine Service
Content Moderation
Image Recognition
Optical Character Recognition
ModelArts
ImageSearch
Conversational Bot Service
Speech Interaction Service
Huawei HiLens
Video Intelligent Analysis Service
Developer Tools
SDK Developer Guide
API Request Signing Guide
Terraform
Koo Command Line Interface
Content Delivery & Edge Computing
Content Delivery Network
Intelligent EdgeFabric
CloudPond
Intelligent EdgeCloud
Solutions
SAP Cloud
High Performance Computing
Developer Services
ServiceStage
CodeArts
CodeArts PerfTest
CodeArts Req
CodeArts Pipeline
CodeArts Build
CodeArts Deploy
CodeArts Artifact
CodeArts TestPlan
CodeArts Check
CodeArts Repo
Cloud Application Engine
MacroVerse aPaaS
KooMessage
KooPhone
KooDrive

Application Scenarios

Updated on 2022-01-25 GMT+08:00

Using SNAT to Access the Internet

If your servers in the VPC require Internet access, you can use the SNAT function to let the servers share one or more EIPs to access the Internet without exposing their IP addresses. In a VPC, each subnet corresponds to one SNAT rule, and each SNAT rule is configured with one EIP. NAT Gateway provides different types of NAT gateways that support different numbers of connections. You can create multiple SNAT rules to meet your service requirements.

Figure 1 shows how servers in a VPC access the Internet using SNAT.

Figure 1 Using SNAT to access the Internet

Using DNAT to Provide Services Accessible from the Internet

To allow your servers in a VPC to provide services for the Internet, you can use the DNAT function.

You can associate an EIP with a DNAT rule. As requests with specific protocol and port access the EIP, NAT Gateway forwards the requests to the port of the target server through the mapping between the ports. Besides, NAT Gateway can forward requests on the EIP to your servers based on IP address mapping. NAT Gateway allows multiple servers to share an EIP, which facilitates bandwidth control.

A DNAT rule is configured for one server. If there are multiple servers, you can create several DNAT rules to make the servers share one or more EIPs.

Figure 2 shows how servers in a VPC provide services accessible from the Internet using DNAT. The servers shown in the following figure can be an ECS, a BMS, or a Workspace desktop.

Figure 2 Using DNAT to provide services accessible from the Internet

Using SNAT or DNAT to Communicate with the Internet in a High-Speed Way

If a large number of servers that in a private cloud or connect to a VPC through a Direct Connect or VPN connection need to securely access the Internet in a high speed way or to provide services accessible from the Internet, SNAT and DNAT can be used in such scenario. The similar scenarios include Internet, games, e-commerce, and finance.

Figure 3 shows how to communicate with the Internet in a high-speed way.

Figure 3 Using SNAT and DNAT to communicate with the Internet in a high-speed way

Configuring Highly Available System Using SNAT

EIPs that bound to resources may be attacked. To improve system reliability, you can add multiple EIPs when configuring an SNAT rule. If one EIP is attacked, services can use another EIP to ensure service running.

If an SNAT rule has multiple EIPs, the system randomly selects an EIP for servers using the SNAT rule to access the Internet.

A maximum of 20 EIPs can be added to each SNAT rule. If EIPs added to an SNAT rule are blocked or unavailable due to attacks, you need to manually delete them from the EIP pool.

Figure 4 shows the networking diagram.

Figure 4 Configuring highly available system using SNAT

We use cookies to improve our site and your experience. By continuing to browse our site you accept our cookie policy. Find out more

Feedback

Feedback

Feedback

0/500

Selected Content

Submit selected content with the feedback