I've been working on diagnosing wireless issues from a Raspberry Pi for almost a year now. And after writing a bunch of python around packet capture and upload I was searching for some airtime calculations when I stumbled across a piece of software called HORST. Standing for Highly Optimized Radio Scanning Tool, HORST allows you to analyze wireless statistics and packets in real time. In just a few minutes, I had it running and was amazed at how well it can analyze a network remotely.
Sunday, September 27, 2015
For those of you who don't know, Aruba has been pretty generous with the TechFieldDay delegates over the last few years. They are a great contributor to the community, even giving away hardware and software at wireless industry events like #WifiTrek and #WLPC. And with #WFD8, we're heading back to Aruba to hear what's new.
Thursday, September 10, 2015
Shortly after #WFD7, I decided to sit down and do some testing with RX-SOP. During a lazy Saturday afternoon in the lab, I was testing this "dangerous" feature to determine why there was so much hesitation about using this feature.
And shortly after starting on my testing, things started to go horribly wrong. I had gotten too aggressive with the setting and my test clients had "hit the wall." Meaning that my clients dropped below the RX-SOP threshold and the AP was no longer responding to it.
Tuesday, February 10, 2015
I'd like to start with the fact that I am an RRM guy. I think Radio Resource Management does a pretty good job of managing TX Power and Channel selection when configured properly. I know that some people out there don't have confidence in RRM, just know that this reflects my opinion regarding the matter.
We covered TX power in part 2 of this series, now let's talk about Dynamic Channel Assignment (DCA). I can't tell you how many times I've been talking with a customer or fellow engineer and they tell me "DCA is broken," "DCA makes poor choices," or "DCA is making poor channel selection choice."
When I ask them to show me why they think this, they generally show me a map that has multiple APs in the hall and several of them are on the same channel and adjacent to each other. Much like the following:
| 1 1 1 11 |
Saturday, December 6, 2014
Thursday, November 20, 2014
A lot of people know that Hallways designs are a bit of a pet peeve of mine. My opinion is that they do not work, and beyond moving the APs out of the hall, you cannot fix them. But the reality is that moving APs and existing infrastructure can be really expensive, time consuming and difficult to get management to buy off on. This means that you probably will have to live with some of your existing hallway designs for the foreseeable future.
In this series, my aim is to explore the options available to improving performance of a hallway design. As an engineer working for a Cisco Gold Partner, I'm going to talk about some of the tools available in the Cisco Unified Wireless Network (CUWN) to help deal with these designs.
I'll leave this short intro post with the following advise:
Don't put APs in the hallway.
Put APs as close to clients as you can get them.
Think about how RRM works, and incorporate that into your designs
Don't put APs in the hallway, PLEASE!