Tackling network capacity in a bring-your-own-device era

IT executives offer insights into how they are managing network capacity in light of the mobile IT influx.

This article can also be found in the Premium Editorial Download: CIO Decisions: How Mobile IT is Revamping Network Strategies:

This is the first in a two-part series on the ways IT executives are managing the strain that mobile devices put...

on network capacity. The second part explores emerging capacity-management approaches for mobile device traffic.

Earlier this year, the OC-3 network Internet traffic at Kroll Factual Data Inc. reached a saturation point of 80%. Given that Kroll, a verification services provider for lenders and creditors, conducts most of its business online, this was bad news on a grand scale.

Now you have laptops, smartphones and tablets using a network that wasn't designed for that amount of traffic.

Randy Nunez,
senior network engineer, Ford Motor Co.'s Mobile Computing IT Enterprise Technology Research division

The culprit was the streaming media slamming the company's network as employees used mobile devices to watch videos and download files. "It was starting to have a detrimental effect on our customers, and for us, that was the end of the story," said Christopher Steffen, principal technical architect at Kroll, a Loveland, Colo., division of global background-screening and security provider Altegrity Inc.

The company's IT team (with management's blessing) had no choice but to block and limit outbound network traffic. Sure enough, the bandwidth saturation rate went from a high of 80% (which caused significant network connectivity problems, if not connectivity standstills) to only 18%, but the limitations put on mobile device use "went over like a lead balloon" with employees, Steffen said.

IT executives across enterprises are trying to get a handle on network capacity in a bring-your-own-device (BYOD) era, and as Steffen put it, "There's 15 to 20 ways to skin this cat."

The solution to network capacity management at Kroll was firewall blockers and network controllers to prevent employees from going to sites like YouTube, as well as the creation of a guest network that handled all the "dirty Internet traffic," Steffen said. This guest network lets employees surf the Internet while keeping the traffic separate from the core network and the back-end systems used for business processes.

Managing the impact of mobile devices on network capacity, however, doesn't lend itself to a "'fire-and-forget' kind of approach," Steffen cautioned. Even with its technology measures in place -- and policies that prevent access to certain sites -- mobile-device traffic management continues to be a moving target at Kroll, requiring exceptions on a case-by-case basis to identify employees who need mobile access to corporate or network resources to get their job done.

The many mobile paths to network capacity enlightenment

Randy Nunez, senior network engineer at Ford Motor Co.'s Mobile Computing IT Enterprise Technology Research division, said the cause is pretty straightforward but there is "no one right answer for everybody" when it comes to dealing with mobile IT traffic.

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"Mobile device traffic is absolutely a major problem as more and more people can afford smartphones and tablets, which are Wi-Fi devices that are now becoming more powerful, with more content available, especially with things like multimedia," Nunez said.

People have come to expect free Wi-Fi wherever they go. The problem is that wireless LANs were not originally built for this kind of capacity. "They were designed for occasional laptop Wi-Fi users; and there was a point where laptops were very expensive, so they were limited. But now you have laptops, smartphones and tablets using a network that wasn't designed for that amount of traffic. And it was also originally built for specific purposes, such as within a conference room or certain locations in a plant," Nunez said.

Nunez said there are three primary ways that enterprises are attempting to accommodate the network capacity needed for mobile device traffic:

  • Keeping up-to-date with the latest wireless LAN standards and understanding the impact of legacy devices. Deploying devices that support the 802.11n standard can increase throughput, and many wireless devices now support this standard. Also, be aware that devices that support only older 802.11b and 802.11g standards can affect the performance of the 802.11n network, so organizations should upgrade those devices where possible.
  • Redesigning the wireless LAN infrastructure. Move from autonomous access-point environments to a controller-based architecture with lightweight access points. "These networks are typically easier to scale and have more robustness," Nunez said.
  • Building a guest network. It might not help with throughput, but it will help with security concerns. For BYOD traffic, companies are taking different approaches. Some are pushing mobile device users onto a guest network, while others are setting up different logical networks with different levels of access for BYOD versus corporate devices.

"Consumerization is happening, large file sharing is happening, and this trend will continue," Nunez said. "It is up to IT to figure out how to accommodate this, because if we don't simulate the kind of experience they get on the consumer side, people will figure out a way to go around us to get their job done."

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I think the idea of using a guest network is a good idea for BYOD in some applications, and so is the idea of setting up different logical networks with different levels of access for BYOD versus corporate devices. At our hospital, we started having HIPAA compliance issues with our doctors using thier smartphones and tablets to send text messages with patient info in them. What we did was set up a seperate closed network with Tigertext Pro, so that all the text messages went through that controlled network, which was HIPAA compliant and secure. I think companies are going to have to get inventive when it comes to network capacities and security with BYOD.
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Are mobile devices causing you to invest more in your network infrastructure?
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Since my upgrade to the latest and greatest smartphone, I find that I have invested much more in my own personal network hardware and infrastructure. I wanted fast and seamless Pass-Off syncing between the smartphone and my laptop, so I upgraded my router and even went so far as to get a wireless hard drive for backup storage without cables. Future purchases include new iCloud subscriptions and wireless printers that sync with mobile devices.
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The diversity of network paths to Internet access has created the MDM, BYOD,a nd policy issues within both Telecom and Enterprise network administrators, the cost is a logical move and trend as a result.
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We are a medium size company so the solutions we are looking at need to be affordable so we are looking at how can we prioritize traffic on our wireless network like we have done our wired network. In stead of blocking UTube giving it a very low priority with limited bandwidth availability.
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