Date: Sun, 3 Jun 2018 19:33:30 +0200 From: Christoph Moench-Tegeder <cmt@burggraben.net> To: freebsd-current@freebsd.org Subject: Re: Can't seem to use 5GHz APs with Intel wireless Message-ID: <20180603173330.p6h7x6vznzxwbqmp@squirrel.exwg.net> In-Reply-To: <20180603145342.qziiv7awhr4cvs73@kazhap> References: <20180601091031.72u7tqfkatsl3guh@kazhap> <20180601223711.GA93642@elch.exwg.net> <20180603145342.qziiv7awhr4cvs73@kazhap>
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## Dhananjay Balan (mail@dbalan.in): > On Sat, Jun 02, 2018 at 12:37:12AM +0200, Christoph Moench-Tegeder wrote: > > Did you try adding "mode 11a" to select 5GHz band? (This might be > > out-of-date, as my WiFi stuff is all on 11) (currently I'm also > > using 2.4GHz only, for compatibility with some devices and the fact > > that I have quite some trouble running 2.4GHz and 5GHz from the same > > interface at the same time). > > I did a bit more testing, I have to admit that I am not well versed in > wifi internals. Here's the non-technical overview: https://en.wikipedia.org/wiki/IEEE_802.11 (The real details can be really gory, but this should be good enough). > 1. ifconfig wlan0 list aps shows my aps having rate 54M (Im not entirely > sure what this means). > But however when I connect to it, it shows up as 11g A data rate of 54 MBit/s would be perfectly in sync with 11g - 20MHz channel width, OFDM modulation, 2.4 GHz. And we see that in this line: > ssid LA03 channel 6 (2437 MHz 11g ht/20) bssid 52:d9:e7:47:c0:c2 And this shows that even MIMO ("Multiple Input, Multiple Output" has been activated (that's the "n" in "11ng"): > media: IEEE 802.11 Wireless Ethernet MCS mode 11ng The 5GHz part of 802.11 is 802.11a (and related, like ac), there's no 5GHz band in 11g. I'm a little puzzled about this: > regdomain FCC4 country DE authmode WPA2/802.11i privacy ON Is the regdomain/country setting correct for your area and matches your AP? Especially in the 5GHz band there are some "gaps" - not all channels may be used in all countries (because of possible interference with radar equipment and other stuff). See: https://en.wikipedia.org/wiki/List_of_WLAN_channels#5_GHz_(802.11a/h/j/n/ac/ax) Regards, Christoph -- Spare Space.
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