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WAN Acceleration Overview
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SonicOS 5.8.1 Administrator Guide
The three separate TCP connections are created between network devices that work together
to accelerate traffic using TCP Acceleration. This reduces response time to packet losses and
increases throughput. The three TCP connections are created independently, with the remote
site’s PC to the remote site’s SonicWALL WXA series appliance connection being the initiator.
If one of the sessions is not established, then the remaining connections are closed
immediately. Traffic is still passed from the remote site to the data center, but it is not
accelerated.
Figure 2 TCP Connections
The following list details the three separate TCP connections and
the transfer of data using
shared databases:
1. The Web Server sends data to the SonicWALL WXA series appliance on the data center
through the SonicWALL NSA/TZ series appliance. The data is stored in a data block and
given a reference index.
2. The SonicWALL WXA series appliance on the data center sends the reference index
(instead of the actual data) to the SonicWALL WXA series appliance on the remote site
through their respective SonicWALL NSA/TZ series appliances.
3. The SonicWALL WXA series appliance on the remote site finds the matching data block,
reassembles the data, and sends it through the SonicWALL NSA/TZ series appliance to the
PC.
Windows File Sharing Acceleration Overview
WAN Acceleration has a wide range of technologies that are aimed at accelerating applications,
improving throughput, and enabling bandwidth scalability. Windows File Sharing (WFS)
Acceleration is a subset of WAN Acceleration.
SonicWALL WFS Acceleration allows remote users to access and share files at near-LAN
speeds over the WAN. Distributed enterprises that deploy WFS Acceleration solutions are often
to consolidate storage to corporate data centers, eliminating the need to back up and
manageable data that previously resided in their remote offices. Basically, the use of WFS
Acceleration within your network reduces the impact of high-latency and low-bandwidth links
by approximating streaming behavior through the use of read-ahead and write-behind
functionality and caching with automatic cache validation.
Internet
PC
Remote Site
Data Center
WXA series
appliance
NSA/TZ series
appliance
NSA/TZ series
appliance
WXA series
appliance
Web
Server
Switch
Switch
3
2
1