WAN Optimization for Data Transfer in Branch to Headquarter Scenarios
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Business requirements have impelled IT organization to deploy their applications over wide area network (WAN) connections to increase productivity, provide ubiquitous access, enhance collaboration, and reduce costs. Although application deployment over WAN connections provides considerable number of advantages, it also comes with some performance limitations and disadvantages such as limited bandwidth, application contention, high latency, and packet loss. As the distance between source and destination of WAN connections and packet loss increase, there is substantial WAN throughput degradation. As mentioned in [1], “given a commonly used maximum window size of 64 KB in the original TCP protocol and 45 Mbps bandwidth, the effective TCP throughput of one flow over a source-to-destination distance of 1000 miles is only around 30% of the total bandwidth. With the source-to-destination distance of 100 miles, the effective TCP throughput degrades from 97% to 32% and 18% of the whole 45 Mbps bandwidth when the packet loss rate increases from 0.1% to 3% and 5%, respectively”. (As cited in introduction.)
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http://purl.org/coar/resource_type/c_93fc
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en