As enterprises have started moving some of their IT projects into the cloud, they are getting comfortable and are now looking to take more advantage of the cloud agility and economic benefits. This opens up new deployment models at a pace that was not possible before. Take for example the following use cases related to XenApp/XenDesktop deployments in a global enterprise with distributed users:

  • Quickly ramping up infrastructure serving a new set of internal customers after a merger
  • Deploying XenApp/XenDesktop solutions closer to the end users while keeping the applications and data centrally in the global data center.

In both of these cases, using the cloud will help immensely in speeding up the deployment. The enterprise can pick any public cloud provider with the right proximity, cost structure and availability to deploy the XenApp/XenDesktop closer to the end users. They can keep the application servers, active directory and rest of the data securely in their own data center. In this model, they are able to reap the benefits of a truly hybrid solution with scale and security.

In this solution, there remains the question of secure connectivity between public cloud and private data center. Most of the cloud providers offer a VPN gateway for enterprises to connect to. But there remains the issue of WAN performance limitations due to latency and/or packet losses in the network. These typically limit the throughput on the WAN connection and affect the performance of the overall solution.

Citrix CloudBridge addresses this issue by combining the secure cloud connectivity with the WAN optimizations to enable a truly seamless hybrid cloud deployment. The key benefits of this integrated approach are:

  • TCP optimization: CloudBridge manages traffic at the network layer by acting as a TCP proxy to accelerate the data transfers. CloudBridge dynamically adjusts the TCP window size and congestion response behavior to maximize throughput for the available WAN conditions (latency and loss).
  • Data compression: CloudBridge implements a high-performance compression engine to reduce the volume of data transferred on the tunnel.
  • Protocol acceleration: Some of the protocols like CIFS or MAPI, could benefit significantly from protocol optimization when running over the WAN. By acting as a local proxy, CloudBridge speeds up the information exchange and frees additional bandwidth that can be utilized for other critical data.
  • QoS: CloudBridge implements deep application-level classification and prioritization of the traffic over the tunnel that help enforce application-level SLAs.

The following picture shows how this solution is deployed.

What’s new?

At Synergy, Citrix is announcing the capability for the enterprise data center to have a single appliance integrating cloud connectivity and WAN optimization. This will be supported on the large data center class CloudBridge appliances initially and can be used in conjunction with the CloudBridge virtual appliances in the cloud:

  • Amazon Web Services: AMI available in the AWS market place
  • Softlayer: Available from the provider
  • BareMetal Cloud and other providers supporting XenServer, Hyper-V or ESXi images: VPX instances available for download from

To understand more about this compelling architecture and the CloudBridge solution, please visit: You can also come meet our product experts and listen to more details of the solution at our Synergy breakout session: