Gateway

Deploy Citrix Gateway in a double-hop DMZ

January 8, 2024

Contributed by:

Some organizations use three firewalls to protect their internal networks. The three firewalls divide the DMZ into two stages to provide an extra layer of security for the internal network. This network configuration is called a double-hop DMZ.

Figure 1. Citrix Gateway appliances deployed in a double-hop DMZ

Deploying Citrix Gateway in a Double-Hop DMZ

Note:

For illustration purposes, the preceding example describes a double-hop configuration using three firewalls with StoreFront, the Web Interface, and Citrix Virtual Apps, but you can also have a double-hop DMZ with one appliance in the DMZ and one appliance in the secure network. If you configure a double-hop configuration with one appliance in the DMZ and one in the secure network, you can ignore the instructions for opening ports on the third firewall.

You can configure a double-hop DMZ to support Citrix StoreFront or the Web Interface installed parallel to the Citrix Gateway proxy. Users connect by using Citrix Workspace app.

Note:

If you deploy Citrix Gateway in a double-hop DMZ with StoreFront, email-based AutoDiscovery for Citrix Workspace app does not work.

How a double-Hop deployment works

You can deploy Citrix Gateway appliances in a double-hop DMZ to control access to servers running Citrix Virtual Apps. The connections in a double-hop deployment occur as follows:

Users connect to Citrix Gateway in the first DMZ by using a web browser and by using the Citrix Workspace app to select a published application.
Citrix Workspace app starts on the user device. The user connects to Citrix Gateway to access the published application running in the server farm in the secure network.

Note: Secure Hub and the Citrix Gateway plug-in are not supported in a double-hop DMZ deployment. Only the Citrix Workspace app is used for user connections.
Citrix Gateway in the first DMZ handles user connections and performs the security functions of an SSL VPN. This Citrix Gateway encrypts user connections, determines how the users are authenticated, and controls access to the servers in the internal network.
Citrix Gateway in the second DMZ serves as a Citrix Gateway proxy device. This Citrix Gateway enables the ICA traffic to traverse the second DMZ to complete user connections to the server farm. Communications between Citrix Gateway in the first DMZ and the Secure Ticket Authority (STA) in the internal network are also proxied through Citrix Gateway in the second DMZ.

Citrix Gateway supports IPv4 and IPv6 connections. You can use the configuration utility to configure the IPv6 address.

The following table suggests the double-hop deployment support for the various ICA features:

ICA feature	Double-hop support
SmartAccess	Yes
SmartControl	Yes
Enlightened Data Transport (EDT)	Yes
HDX Insight	Yes
ICA Session Reliability (Port 2598)	Yes
ICA Session Migration	Yes
ICA Session Timeout	Yes
Multi-Stream ICA	Yes (TCP only)
Framehawk	No
UDP audio	No

Prepare for a double-hop DMZ deployment

To prepare appropriately and avoid unnecessary problems when configuring a double-hop DMZ deployment, you must answer the following questions:

Do I want to support load balancing?
What ports do I must open on the firewalls?
How many SSL certificates do I need?
What components do I need before I begin the deployment?

The topics in this section contain information to help you answer these questions as appropriate for your environment.

Components required to begin the deployment

Before you begin a double-hop DMZ deployment, ensure that you have the following components:

At minimum, two Citrix Gateway appliances must be available (one for each DMZ).
Servers running Citrix Virtual Apps must be installed and operational in the internal network.
The Web Interface or StoreFront must be installed in the second DMZ and configured to operate with the server farm in the internal network.
At minimum, one SSL server certificate must be installed on Citrix Gateway in the first DMZ. This certificate ensures that the Web browser and user connections to Citrix Gateway are encrypted.

You need extra certificates if you want to encrypt connections that occur among the other components in a double-hop DMZ deployment.

The official version of this content is in English. Some of the Cloud Software Group documentation content is machine translated for your convenience only. Cloud Software Group has no control over machine-translated content, which may contain errors, inaccuracies or unsuitable language. No warranty of any kind, either expressed or implied, is made as to the accuracy, reliability, suitability, or correctness of any translations made from the English original into any other language, or that your Cloud Software Group product or service conforms to any machine translated content, and any warranty provided under the applicable end user license agreement or terms of service, or any other agreement with Cloud Software Group, that the product or service conforms with any documentation shall not apply to the extent that such documentation has been machine translated. Cloud Software Group will not be held responsible for any damage or issues that may arise from using machine-translated content.

Deploy Citrix Gateway in a double-hop DMZ

January 8, 2024

Contributed by:

January 8, 2024

Contributed by:

Deploy Citrix Gateway in a double-hop DMZ

How a double-Hop deployment works

Prepare for a double-hop DMZ deployment

Components required to begin the deployment

In this article