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Showing content from https://help.tableau.com/current/server-linux/en-us/server_tsig_overview.htm below:

Tableau Server Independent Gateway - Tableau

This topic provides an overview of Tableau Server Independent Gateway.

Independent Gateway is a reverse proxy server and load balancer based on Apache httpd. It uses the same Apache httpd version as the Tableau Server Gateway process internal to Tableau Server cluster, but it is suitable for deployment in a network DMZ. Because Independent Gateway is a part of Tableau Server, it is managed by TSMÂ and does not need separate configuration.

Its configuration has full knowledge of the topology of externally accessible Tableau Server components, and is updated when the cluster topology changes. After a simple Independent Gateway installation process, configuration choices are made centrally using Tableau Services Manager (TSM) configuration items.

With this feature, Tableau Server can now be configured in two ways:

Install Tableau Server in a self-contained installation. Any reverse proxy needs to be installed and managed separately.
Install Tableau Server and install Independent Gateway as a reverse proxy that is managed by Tableau Server (version 2022.1 and later).

Why use Independent Gateway?

Using Independent Gateway has the following benefits over installing a separate reverse proxy:

Fully supported: The Independent Gateway is part of a Tableau Server installation, and is fully supported by Tableau.
Tableau Server aware: When you use a separate reverse proxy, it needs to be updated when the topology of Tableau Server changes. Independent Gateway is fully aware of all externally-callable Tableau Server components, and is updated when these change.

Managing Independent Gateway License Management

To use Independent Gateway you must have Advanced Management capabilities in Tableau Server. There is no licensing done on the Independent Gateway node. For more information, see About Tableau Advanced Management on Tableau Server. If you donât have an Advanced Management key activated or if the license is expired, you will see the following behavior:

If you try to configure Tableau Server with Independent Gateway it will fail.
If you are already using Independent Gateway, and the Advanced Management license expires, the server will fail on restart.

Backup and Restore

There is no impact to backup or restore with Independent Gateway. A backup or restore of Tableau Server will not include any information or configuration for Independent Gateway. If you use the backup to create a new installation of Tableau, you will need to separately install, configure, and enable Independent Gateway for the new Tableau Server installation.

High Availability Considerations

You can install multiple instances of Independent Gateway to provide robust high availability in your reverse proxy. You might also want to increase the number of Independent Gateway nodes if you have large numbers of client sessions accessing Tableau.

All nodes must be running the same operating system. For more information, see Software Requirements for Multi-node Server.

Topology

When you configure Tableau Server with Independent Gateway, you no longer need to set up and configure a separate reverse proxy. Independent GatewayÂ will appear on the TSM status page as an external service.

Note:Â The status page and the status output on the CLI will only show a single instance of Independent Gateway, even if you have installed multiple Independent Gateway nodes.

Install Tableau Server with Independent Gateway