I was fortunate enough to have some alone time with NetScout’s brand new AirCheck G2 (announced May 17, 2016). I tried to play with every feature and capture every screen but there are just so many tricks in this handy box… Here is what I liked.
The AirCheck G2 is green, very green! I find it difficult to identify how I actually feel about the old yellow or the new green. The colour does provide a critical function as hand held tools are easy to put down and leave somewhere. Bright colours aid finding and reminding not to leave the unit behind. This is a tool for people tasked with any variation of the following roles: managing, maintaining, installing, securing, troubleshooting, testing, hacking, supporting and auditing wireless networks. Within 10 seconds of being turned on the AirCheck begins to scan the nearby wireless environment. It collects information about networks, Access Points, clients and channels which are all accessible under corresponding menu buttons on the home screen. You can tell your AirCheck is working hard in the background as it indicates the current channel being scanned at the top of the screen. It’s also likely the counters indicating found networks, Access Points and clients are increasing on each button.
The channel utilisation screen is much like the previous AirCheck with a bar for each channel in which dots report Access Points detected, blue bars report channel utilisation caused by 802.11 sources and grey bars represent non WiFi utilisation. This is a great screen for a rapid view of the WiFi environment. Note though that this is not a spectrum analyser. Selecting a channel from here presents a more granular look at utilisation, signal level in dBm and direct access to view the clients and Access Points which are operating on the channel. Hunting down specific Access Points or clients is made easier with the Locate feature, which is an option if you select a specific station from either the Access Points or Clients lists. I liken an AirCheck in this mode to a security guards handheld metal detector for WiFi Engineers. You’ll hear beeps increasing in frequency as you near your target (this can be muted if you are hoping for a silent kill) and the signal strength indicator and histogram assist in human computed trilateration. If client or crowd density, time to find or large distances are factors in your search then the exorbitant directional antenna option would be handy. This allows the operator to better isolate the direction in which signal from the station is at its strongest. Simply seeing whats nearby is cool but testing the network is where the AirCheck G2 begins to pay for itself. With the ability to associate to WPA2 Enterprise network (and all lesser options) with a great variety of EAP options the AirCheck can squash the time required to audit and test connecting to wireless networks. This is a good idea after deploying new infrastructure. You can even pre-load network profiles via the management software available for 64-bit Windows 7, 8 and 10 devices. Once connected you can perform roaming tests with detailed logging and check connectivity to DHCP, gateway, websites and DNS. Some of this data is then uploaded to Link-Live (for cloud logging) or full session data can be exported to the Windows management application.
Curiously, the right hand side of the AirCheck G2 is home to three USB ports. On that note I will finish up with one word: Roadmap Loves:
I would Love:
If you are not already standing and shouting at your computer “Shut up and take my money” let me know why in the comments below. If you are interested in buying one (Australia/NZ and Asia Pacific readers) then let me know here.
Links: AirCheck G2 - Virtual Test Drive & Product Specs AirCheck G2 - Overview Video WifiHax at CWNP - Dilip Advani demonstrates the AirCheck G2 live
Comments
A couple of years ago I played around with some Mac OS X clients and a packet analyser in an attempt to gain a better understanding of what was going on between the clients when using AirDrop. I was intrigued to see if there was any interaction with local wireless infrastructure. We had been receiving assistance requests from School IT Teams regarding wireless performance where they attributed the issue to student use of AirDrop. So I took a peek at packets and frames to see if I could uncover anything that might be useful from a vendor level to better co- or inter-operate with AirDrop. I was surprised by how efficient the data transfer was. Inter device file sharing seemed so smooth and transfers were fast. Should I have been so surprised? Of course cutting out an AP (or a hop in a single duplex network) will improve performance. Apple’s laser focus on end user experience bypassed the thought that vendors might struggle with the concept of co-inhabiting an airspace where clients have direct wireless interaction. The implementation of AirDrop was relatively user friendly and has only improved with the integration with iOS devices. It’s this user centric vision that lead me to my next thought... WiFi networks can provide a great user experience as long as they are expertly designed and are maintained over time. I have come across many networks that bed-in for 1 or 2 years (or less in extreme cases) and then feel like they are becoming sluggish and old. It’s time to call for a WiFi Audit! An experienced WiFi auditing engineer will have worked with many networks, large and small. Their experience will range right across the lifecycle of systems they have helped build - from conception and design through to troubleshooting existing implementations. The expert you need to help maintain your system will understand that tools are only an aid to help visualise what cannot be seen. While these tools are important and certainly speed up the process of understanding a system, they are not the silver bullet to ensuring peak performance throughout a wireless networks life-span. I have seen some engineers work with mechanic-like "44 point checks” when auditing systems. It’s good to see people working through systematic process, with reminders not to skip critical checks that might uncover painful mistakes in configuration or design. Here are some of the fundamental points that I believe need to be included in an audit (this is not an exhaustive list): • Understanding the business goals that are impacted by WiFi • Getting out and experiencing the network • Taking measurements (RSSI, SNR, 802.11 and non-802.11 RF) • Understanding the concepts behind the initial system design • Hearing from the users • Reviewing system logs and configuration • Building a coherent report • Making recommendations that will bring value It is hard to come up with a recommended definitive frequency for WiFi audits - the exception to this is that a yearly audit is a critical minimum. An organisation’s needs can change drastically in a year. Simple trending suggests that user applications are demanding more bandwidth and generally users are working differently to how they did one year ago. Jim Florwick from Cisco said "Only one thing has remained constant in wireless networking, the persistent need for more”. Jim is a Senior Technical Marketing Engineer. This certainly sounds like a statement that would come out of Marketing. There are many cases where an existing network is sufficient or with some tuning can perform better than it ever has. While I don’t disagree that overall eventually wireless networks need to be updated with the addition of “more” of something, it would be easy to use this statement to sell more Access Points without looking at the viability of the existing system. So, find yourself an experienced WiFi engineer who can audit your network. Interview them to ensure their suitability. Maybe you could ask them to explain a time they had tried to troubleshoot a problem but only learned of the fault or misconfiguration afterwards - it’s these sorts of experiences that will help you gauge their care factor. Remember, it is experience backed by fundamental knowledge that builds wisdom. |
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