As wireless devices improve in power and portability, exceptional on-the-go performance is expected from devices such as tablets, cell phones, and mobile VoIPs. Starting with firmware version 3. However, Fast Roaming does not require client support, allowing backwards compatibility with all clients.
When a client connects to an access point on any secure network, a verification process is started. For example, on a WPA2 Enterprise network, the following process must be completed before network access is granted:. Eight of the nine actions above are exchanges, each requiring two steps. This brings the total number of steps to With BSS Transition, the connection is established in just four steps.
This is accomplished by allowing the client to keep a master key eliminating steps and grouping data packs. Data packets from steps 8 and 9 are grouped with the packets for steps 1 and 2. The result is a process of only 2 data exchanges:.
By reducing authentication steps with Like While it allows clients to roam without any added latency, ZHO does have some limitations. When enabled, all APs in the network use the same radio channel, effectively converting the entire network into a single AP.
While this completely eliminates roaming latency, all wireless traffic must compete for airtime on a single channel. The result is a more sluggish network, especially with several clients online. Fast Roaming offers an improvement in roaming latency, while maintaining overall network performance.
To explore the improvement that Fast Roaming offers, a couple tests were done to compare network performance using four different AP configurations:. Testing was carried out on an In addition to the smartphone, two other ac clients were connected to the network: one desktop computer, streaming video on Netflix, and one laptop, streaming music on Pandora.
The test was performed three times for each configuration and averaged the results:. As you can see, ZHO finished last in upload and download speeds, even with just 3 client devices connected. Because all ZHO traffic uses a single channel, we could expect its performance to be even worse on a busier network. Fast Roaming offered the second lowest speeds, but was much more comparable to the previous roaming protocols. Next, a ping monitor was used to test roaming times.
The monitor documents each packet sent between the client device and an AP.We have tried to set the settings low so that this won't happen but even with them set low we have some bleed over. We are working really well in most spots but these few spots could kill the project. We also can't keep a server connection at hand off. These are the settings we are using. All 2G Radios are set to 1, 6 or Any Suggestions for better handoffs wold be greatly appreciated.
Are you trying to implement what Ubiquiti calls Zero Hand Off? If so, you should read this. They recommend that ZHO not be implemented. We are not using ZHO.
I have 4 of these Unifi APs in a small-ish building. If your Unifi controller is up to date, and the APs are on the latest firmware i'd say it's something else. Have you tried different machines and see the same issue?
Is it older hardware? Corbin how far apart are your APs? Maybe we have too many APs. I would power up the 5Ghz band more, because the pass-loss is higher on 5Ghz band, and acutally, there are more channels to be used in 5Ghz means less co-channel-interference problem to be worried. Many loptops are designed to be less sensitive to signal strength because it is still a "portable device".
The benefit of increasing 5Ghz power is let the client connect to 5Ghz, and when the Macbook didn't make the best roaming decisions, the signal is still strong enough without causing problems. The other thing that happended to me before, i tried to google it but not see much result is that the Macbook can be interfered by other AP's For signal strength threshold, I've tried Ubiquiti's but in my opinion, it is not sophiscated enough because the signal can drop off for many reasons, such as people walked by, so i suspect it didn't monitor the "average" signal strength and disconnect client too aggressively so i turned it off.
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Read these nextIndustry standard implementations that reduce the time needed for a device to roam from one wireless access point AP to another are now supported. Wireless Access Points APs that support Neighbor Reports contain information about neighboring access points and allows the device to have a better understanding of its surroundings.
APs that support This time reduction results from fewer frames being exchanged with the AP prior to data transfer. By decreasing the time before data transfer when the device roams from one AP to another, the connection quality is improved for latency sensitive applications, such as an active Skype call.
With the combination of VoIP applications can now take advantage of this improved roaming to deliver better call quality when users are not stationary. Please check with your device manufacturer to determine whether or not your device supports these features. In addition to device-side support, the network AP Controllers and APs must also support the features for the experience to work.
Please check with your network administrator to see if these features are supported and have been enabled on the network in question. All three features require AP-side support and will not work without those features enabled on the APs. You may also leave feedback directly on GitHub.
Skip to main content. Exit focus mode. Fast Roaming with Related Articles Is this page helpful? Yes No. Any additional feedback? Skip Submit. Send feedback about This product This page. This page. Submit feedback. There are no open issues.Welcome, Guest. Please login or register. Did you miss your activation email? This topic This board Entire forum Google Bing. Print Search. Author Topic: WiFi fast roaming recommendations? Read times. Kirkhaan Regular Contributor Posts: 82 Country:.
I'm planning to upgrade WiFi in my home. The wireless router and AP get an upgrade. Important for me it that the router and AP support fast roaming my present system does not support this, and it annoys me!
I've been looking around and are very pleased by what Edimax Pro offers. But I thought, lets also check here. Halcyon Super Contributor Posts: Country:.
Their performance and reliability is just fantastic. May I ask why you specifically want fast roaming to be on? Devices "roam" just fine between them. However roaming on Wi-Fi is far from perfect, in fact it's quite terrible, even with It was never designed for it so it doesn't do things like hand-over between radios like a normal cellular network would. Even Ubiquiti's routing products aren't up to scratch in my opinion. My recommendation is get yourself a good, high quality enterprise access point, a single unit with high gain should easily cover even a moderate to large sized home depending on the RF environment.
Keep Monkeh Super Contributor Posts: Country:. Quote from: Halcyon on November 30,am. Quote from: Monkeh on November 30,am.Roaming Test: Ubiquiti und Cambium
Monkeh, I think you're confusing yourself a little. ALL Access points which support Ubuquiti's fix as I mentioned in my last post was to disable Fast Roaming by default and add a warning in the firmware that enabling it can leave you open to vulnerabilities.
If you read Cisco's or Aruba's documentation, they all explain the same thing. I stand by my recommendations, even to the extent that I use it at home, even as a network and wireless expert by profession. I use multiple access points as I have a large split level home and I run more than one 5 GHz network simultaneously.
I also do this to improve outdoor coverage. For the average home user that just wants a single WLAN, one decent quality access point is usually fine.
The following users thanked this post: ogden. Monkeh, so now're you're linking me to another page, that explains exactly the same thing I just mentioned. We can keep going back and forth with this, but you are wrong. Also whilst 5 GHz penetrates less than 2. What is far more likely to affect your Wi-Fi performance is your RF environment, band plan, neighbouring access points etcThe When the signal strength of the current AP weakens, your device will scan for target APs from this list.
FT works with both preshared key PSK and Adaptive The device takes this information into account when deciding among the possible roam targets.
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DMS optimizes multicast traffic transmission on wireless networks. The device uses this information to enhance multicast communication and preserve device battery life. The BSS Max Idle Service helps clients and access points efficiently decide how long to remain associated when no traffic is being transmitted.
The device uses this information to preserve device battery life.
802.11 WLAN Roaming and Fast-Secure Roaming on CUWN
When you combine Most Wi-Fi network hardware vendors support You need to enable and configure these features on your Wi-Fi router before your network can use them. Setup varies, so check your Wi-Fi router's manual for details. The lists below show which iOS devices support To use To use adaptive To support adaptive Information about products not manufactured by Apple, or independent websites not controlled or tested by Apple, is provided without recommendation or endorsement.
Apple assumes no responsibility with regard to the selection, performance, or use of third-party websites or products. Apple makes no representations regarding third-party website accuracy or reliability.
Contact the vendor for additional information. Wi-Fi network roaming with Learn more Most Wi-Fi network hardware vendors support Pairwise master key identifier caching iOS 5. Yes No.This document describes the different types of wireless roaming and fast-secure roaming methods available for IEEE The document does not provide all of the specifics about how each method works or how they are configured.
The main purpose of this document is to describe the differences between the various techniques available, their advantages and limitations, and the frames-exchange on each method.
Examples of WLAN Controller WLC debugs are provided, and wireless packet captures are used in order to analyze and explain the events that occur for each roaming method described. The information in this document was created from the devices in a specific lab environment.
All of the devices used in this document started with a cleared default configuration. If your network is live, make sure that you understand the potential impact of any command. Before a description of the different fast-secure roaming methods available for WLANs is given, it is important to understand how the WLAN association process works, and how a regular roaming event occurs when there is no security configured on the Service Set Identifier SSID.
When an Then, the association process must be completed. Think of the Open System authentication process as "connecting the cable" on the AP that the client selects. This is very important to understand, because it is always the wireless client that selects which AP is preferred, and bases the decision on multiple factors that vary between vendors.
This is why the client begins this process by sending the Authentication frame to the selected AP, as shown later in this document. The AP cannot request that you establish a connection. Once the Open System authentication process is completed successfully with a response from the AP "cable connected"the association process essentially finishes the The AP assigns an association ID to the client if the connection is successful, and prepares it in order to pass traffic or perform a higher-level security method if configured on the SSID.
The Open System authentication process consists of two management frames as well as the association process. Authentication and Association frames are wireless management framesnot data frames, which are basically the ones used for the connection process with the AP. The wireless client begins with the Authentication frame, and the AP replies with another Authentication frame. The client then sends the Association Request frame, and the AP finishes in a reply with the Association Response frame.
As shown from the DHCP packets, once the In this case, there is no security method configured on the SSID, so the client immediately begins to send data frames in this case DHCP that are not encrypted.
Data frames can only be sent until the client is fully authenticated, and the encryption keys are negotiated, based on the security method configured. Based on the previous capture, here are the messages that you see in the outputs of the WLC debug client command when the wireless client begins a new association to the WLAN:. What information appears when the client roams?
The client always exchanges four management frames upon establishment of a connection to an AP, which is due to either client establishment of association, or a roaming event. The client has only one connection established to only one AP at a time.Sponsored by:. I'm increasingly of the view that both my time and my sanity are worth more and more as the years progress. Particularly in my independent life, it really can be that black and white - if I can't work, it costs me money.
Plus, I want to be happy and few things make me less happy than computer bits going wrong:. They were well-reviewed and I figured I'd put them at opposite ends of the place, throw in a couple of switches as well and we'd be all good. Now maybe if I was your everyday garden variety home user it would have been ok, but I'm not and if you're here on my blog reading this then you're probably not either.
The first thing that got me with these devices is that it felt like nothing had changed since the very first wireless access points I had over a decade ago. Same basic interface, same simple settings, same "just get it set up then never look at it again" paradigm. Also the same approach to updating the thing: you're not going to see many changes to the firmware.
I had Billion devices before Linksys and I don't think I ever saw a firmware update over many years which worried me not just because I'm sure there was broken stuff in there, but because it was never evolving.
It was like "here's your router, uh, good luck! And then the Linksys started misbehaving. I'd be working away on the laptop on wifi and the connection would just drop to almost nothing. Instead of 40Mbps down per the tweet above, it'd drop to less than 2. Wired connections were fine and power-cycling the router would fix it, but every time a page was a bit slow I'd be wondering if it was cactus again.
After venting on Twitter, I got a variety of responses including that I should install the open source dd-wrt firmware or that I should buy a power adaptor that can automatically cycle the power every night. No, no, a hundred times no to both - if I buy a product then I expect it to work as advertised and not need to implement hacks to keep it alive. There's also extensive evidence out there that this is just what many Linksys products do and the more I looked into it, the less convinced I was that it was ever going to be acceptable whilst I had Linksys devices in the house.
But I also got a resounding chorus of people telling me to just "do it properly" and go buy Ubiquiti bits. Admittedly, this bugged me because I didn't want to buy new stuff, I wanted the stuff I already had to work properly. But the more I thought about it and particularly as I looked into it, Ubiquiti made a lot more sense. Plus, I frankly just had to get over my sense of loss aversion - it is what it is with the Linksys devices, now what's the smartest thing to do?
It was Ubiquiti. Let me share what I got, how it works and how it's finally solved my long-running wifi dramas.