Sangfor Technologies | WAN Optimisation Blog
22Aug/11Off

Bandwidth Management – It’s Raining QoS!

Your WAN capacity is running close to its limit, users are complaining about slow loading speeds of business critical applications and backups are falling outside of their windows... this scenario is played out in companies across the world, so how do you solve the problem?

Reducing the raw data travelling across your WAN by either blocking access to certain bandwidth heavy websites or deploying a WAN Optimiser can take the pressure off for a while, but you will still be at risk of suffering slowdowns and high latency due to the steady increase of your base traffic levels or from bandwidth hungry applications flooding all the available capacity. It’s obvious another technology is needed to guide and shape the bandwidth in addition to optimisation and acceleration, making sure specific applications and protocols either have access to a minimum level of bandwidth or are limited to a maximum level and can’t take all of the bandwidth for themselves.

I am, of course, talking about Quality of Service (QoS).

On its own, QoS helps to partition up your WAN link into many “virtual lines” and will throttle or burst traffic depending on your needs and the configuration set on the device. The drawback here is when you don’t have any WAN Optimisation you can quickly outgrow your connection because you’re trying to squeeze traffic down an even smaller section of your pipe.

Taking advantage of QoS usually means replacing network infrastructure with expensive switches, choosing your firewall because it supports that feature or even buying a device which is dedicated to the task. WAN Optimisers from Sangfor includes QoS as one of its core features for bandwidth management and together with traffic optimisation/acceleration make a complimentary pairing to get the best performance out of your current WAN infrastructure at a fraction of the first year upgrade cost.

This works because our units can identify traffic based on its TCP port and by using Layer 7 Application Identification, apply optimisation to the traffic to reduce the flow of data and then pass this reduced traffic onto the QoS module in order to shape it in accordance to your specific policies. Since we can identify traffic at the packet level, you don’t need to set up any additional rules should it be running across a non-standard ports – such as VMWare server using HTTP across port 8333 for its administration interface – reducing the maintenance required on your policies whenever you implement a new system/service.

Through this unified approach, not only can you dramatically improve the performance of your WAN communications but you can keep a constant eye on your changing usage patterns and respond based on solid data provided by our reporting module. This way you won’t ever let a single application bring your WAN to a crawl or waste a single byte of your precious bandwidth.