Network Optimization

WAN performance issues

Let’s start by surveying two major causes of WAN performance problems:

  •  Latency: This is the back-and-forth time resulting from chatty applications and protocols, made worse by distance over the WAN. One server sends packets, asks if the other server received it, the other server answers, and back and forth they go. This type of repeated communications can happen 2,000 to 3,000 times just to send a single 60MB Microsoft PowerPoint file. A somewhat simple transaction can introduce latency from 20 ms to 1,200 ms per single file transaction.
  • TCP window size: Adding more bandwidth won’t necessarily improve WAN performance. Your TCP window size limits throughput for each packet transmission. While more bandwidth may give you a bigger overall pipe to handle more transactions, each specific transaction can only go through a smaller pipe, and that often slows application performance over the WAN.


How Wan optimizator overcomes these problems

Wan optimizator is a bookend technology in which one Wan optimizator sits at the data center and another at the edge. Wan optimizator works with any WAN because it sits behind routers, which terminate the WAN at each end. The worse the WAN performance and the further the distance between the locations they connect, the bigger the effect WAN optimization has on performance.

The bookended Wan optimizator analyzes each packet as it goes on and off the routers.

 

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