# Change History

Released On | Description
--- | ---
2021-03-18 | This release incorporates the following changes: Added section "Managing NAT Gateway Tags".

2020-07-30

This release incorporates the following changes:

- Organized FAQs by category.

2020-01-08

This release incorporates the following changes:

- Updated the screenshots of creating a NAT gateway, adding an SNAT rule, and adding a DNAT rule.
- Added Monitoring Management.

2019-09-18

This release incorporates the following changes:

- Added the description about DNAT rules in What Is NAT Gateway?
- Optimized the networking diagram and added the scenario of providing services accessible from the Internet in Application Scenarios.
- Added constraints on DNAT rules in Notes and Constraints.
- Added Using DNAT to Provide Services Accessible from the Internet.
- Added Step 4: Verify the Result.
- Added Step 5: Add a DNAT Rule.
- Updated Creating a NAT Gateway.
- Added Managing DNAT Rules.
- Updated the screenshots of adding an SNAT rule and adding a DNAT rule.
- Modified the description about EIP parameters.
- Modified the description about Outside Port.
- Integrated basic concepts.

2019-03-19 | This release incorporates the following change: Accepted in OTC-4.0/Agile.
2019-03-18 | This release incorporates the following changes: Deleted redundant content from sections NAT Gateway Types, What Are SNAT Connections? and How Does A NAT Gateway Offer High Availability?

2019-03-13

This release incorporates the following changes:

- Optimized the flowchart in section Overview.
- Updated Step 1: Create a Direct Connect Connection.

2019-01-31

This release incorporates the following changes:

- Updated Step 3: Add an SNAT Rule.
- Updated Step 4: Add an SNAT Rule.
- Updated Adding an SNAT Rule.
- Updated Deleting an SNAT Rule.

2019-01-15

This release incorporates the following changes:

- Added Using SNAT and DNAT Rules to Allow On-premises Servers to Communicate Over the Internet.
- Supported custom CIDR block for SNAT rules.

2018-02-16 | Accepted in OTC 3.0.
2018-02-08 | This release incorporates the following changes: Added operation scenarios and prerequisites in chapter Getting Started.

2018-02-04

This release incorporates the following changes:

- Added titles to the figures.
- Added operation scenarios and prerequisites in section Modifying a NAT Gateway.

2018-01-23

This release incorporates the following changes:

- Added the NAT Gateway architecture diagram in section What Is NAT Gateway?
- Modified the description of NAT Gateway deployment advantages in Product Advantages.
- Updated the operation flowchart.
- Added restrictions on the naming rules and description for creating a NAT gateway in Step 2: Create a NAT Gateway.
- Added Modifying a NAT Gateway.

2018-01-15 | This issue is the first official release.