DFS channels are really well supported on computers and phones released in the last two years or so, including the 2e band, and it's a pretty safe assumption that in another year or two DFS support for these devices will be a non-issue. Those that do have a problem are mostly 2e, though UNII2 isn’t too far behind. Many older phones lack any UNII2(e) support, and the three year old Nexus5 (released about 3.5 years ago) that I just retired a few weeks ago didn’t support any DFS channels.
For other devices, all bets are off. They’re just as likely not to support DFS as they are to support it and I don’t know if that will change any time soon. From: "Jason Cook" <[email protected]> To: "Chuck Enfield" <[email protected]>, "EDUCAUSE Wireless Issues Constituent Group Listserv" <[email protected]> Sent: Wednesday, April 19, 2017 7:49:24 PM Subject: RE: [WIRELESS-LAN] 5 GHz Only Admin WLAN A Good point. Are all DFS channels a problem for some clients or is it primarily in the UNII2e spectrum and the UNII2 is ok? I was understand the issue was with UNII2e only but don’t actually know -- Jason Cook Technology Services The University of Adelaide, AUSTRALIA 5005 Ph : +61 8 8313 4800 From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:[email protected]] On Behalf Of Chuck Enfield Sent: Tuesday, 18 April 2017 10:26 PM To: [email protected] Subject: Re: [WIRELESS-LAN] 5 GHz Only Admin WLAN In response to, “ 2.4 GHz is seeming less and less like a thing to worry about, as most devices are already using 5GHz.” I’d caution that 5GHz is a big band, and few devices support every channel in it. If you want to get the most out of 5GHz by enabling DFS channels, you have to give clients that don’t support a particular channel something to connect to. I can think of two ways to do that. 1) You can provide overlapping 5GHz coverage, but that’s only reliable if your radio management is smart enough to ensure there’s a non-DFS channels available everywhere. I’m not sure any do that yet. 2) Dual-band clients in an area covered by a 5GHz channel they don’t support can use 2.4GHz if the SSID supports it. My recommendation is to leave 2.4GHz enabled if you use DFS channels. From: The EDUCAUSE Wireless Issues Constituent Group Listserv [ mailto:[email protected] ] On Behalf Of Steve Bohrer Sent: Friday, 14 April 2017 2:00 AM To: [email protected] Subject: Re: [WIRELESS-LAN] 5 GHz Only Admin WLAN Seems fine, but what's the big deal with having the 2.4 available? Are you trying to minimize the amount of (limited) 2.4 GHz bandwidth taken by beacons? Or do you just want to assure that the devices you care about don't inadvertently grab a slow 2.4 connection? We are way smaller than you guys, but just with Aruba doing its standard ARM stuff, typically less than 10 percent of our connected devices are on 2.4 GHz. The majority of these are are "registered" student devices that can't do 802.1x or 5GHz, mostly game machines. Of the rest, many seem to things that have hopped on our "guest" network but then not actually signed in at the portal. My assumption has been that these are phones in the pockets of the many non-Emerson people who walk by our buildings. So, 2.4 GHz is seeming less and less like a thing to worry about, as most devices are already using 5GHz. Steve On Thu, Mar 23, 2017 at 9:11 PM, Jason Cook < [email protected] > wrote: We run 3 SSID”s essentially doing the same thing but with one 5ghz only. It wasn’t targeted for devices where we have more control but as workaround to devices connecting at 2.4 when there’s a perfectly good 5ghz there. UofA UofA 5ghz eduroam However I don’t like the extra SSID. So the pencilled plan at this point is to disable 2.4Ghz on UofA, and remove the UofA 5ghz network. Anyone needing 2.4 can use eduroam. That would be end of year, so we’ll see if it actually happens. We don’t advertise on our website anything about the 5ghz only network, so there’s no huge take-up which is ok as it wasn’t meant to be permanent. However it’s certainly done its job with users on it no longer having the issue of jumping back to 2.4 (including me). -- Jason Cook Technology Services The University of Adelaide, AUSTRALIA 5005 Ph : +61 8 8313 4800 From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto: [email protected] ] On Behalf Of Lee H Badman Sent: Friday, 24 March 2017 11:21 AM To: [email protected] Subject: Re: [WIRELESS-LAN] 5 GHz Only Admin WLAN Existing SSID, turn off 2.4. Lee Badman (mobile) On Mar 23, 2017, at 10:17 AM, Jeffrey D. Sessler < [email protected] > wrote: BQ_BEGIN Are you speaking about a separately named SSID, or looking to use an existing SSID and radius to steer those clients into a different “admin” network? Jeff From: " [email protected] " < [email protected] > on behalf of " [email protected] " < [email protected] > Reply-To: " [email protected] " < [email protected] > Date: Wednesday, March 22, 2017 at 1:13 PM To: " [email protected] " < [email protected] > Subject: [WIRELESS-LAN] 5 GHz Only Admin WLAN Wondering how many of you are running 5 GHz single-band WLAN for admin networks, where I’m assuming there is more control over device HW configs. I’m specifically contemplating it for an SSID where we use domain-joined laptops. Been there? Done that? Can you tell me about your t-shirt? Thanks- Lee Lee Badman | Network Architect Adjunct Instructor | CWNE #200 Information Technology Services 206 Machinery Hall 120 Smith Drive Syracuse, New York 13244 t 315.443.3003 f 315.443.4325 e [email protected] w its.syr.edu SYRACUSE UNIVERSITY syr.edu ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss . ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss . ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss . ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss . BQ_END -- Steve Bohrer IT Infrastructure, Emerson College 617-824-8523 ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss . ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss . ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss . ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss.
