When it comes to virtual desktop infrastructure, administrators have a lot of choices. You may have wondered about the differences between VDI software options, remote display protocols or all the licenses out there. In this series, we tackle some of the biggest head-scratchers facing VDI admins to help you get things straight.
In VDI environments, the remote display protocol has a big responsibility: to transmit data from a data-center-hosted desktop to the endpoint.
Popular remote display protocols offer high-resolution sessions, multimedia stream remoting, multi-monitor support, dynamic object compression, USB redirection, drive mapping and more. Microsoft's Remote Desktop Protocol (RDP), VMware's PC-over-IP (PCoIP) and Citrix's HDX are the most commonly used, but there are other protocols from companies such as Ericom and Hewlett-Packard.
Each remote display protocol works differently depending on the network and which applications are being delivered, so you need to know how the major protocols diverge. Let's get this straight.
What's under the hood of a remote display protocol?RemoteFX, HDX and PCoIP are Layer 7 protocols that are based on two Open Systems Interconnection (OSI) stack Layer 4 protocols. the User Datagram Protocol (UDP) and Transmission Control Protocol (TCP). TCP divides data into packets and reassembles them at the endpoint, while UDP does not sequence the packets.
TCP is more reliable because it makes sure that a connection is maintained until all the data is delivered. Plus, if an error occurs, TCP sends the affected data again. UDP does not confirm that all packets are received at the endpoint, but that means it's faster for delivering media-heavy messages such as video.
Remote display protocols have their limitations, especially when it comes to delivering graphics-intensive applications. Great performance requires a lot of bandwidth, which can clog the network. Plus, if you want low CPU use, your protocol will hog bandwidth and weaken end user performance. As desktop virtualization expert Brian Madden says, you can have ",low bandwidth, good experience, low CPU … pick any two.",
Microsoft RDP/RemoteFXRemoteFX. an enhancement to Microsoft's Remote Desktop Protocol. was released with Windows Server 2008 R2 to boost high-definition graphics rendering. RemoteFX works on Hyper-V only, although Citrix Systems Inc. does support the protocol for use in XenDesktop environments. Windows Server 2012 RemoteFX allows Remote Desktop Services to use UDP when necessary, while previous versions could only use TCP.
RemoteFX and Windows Server 2012
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