[Bug 209939] Wireless connectivity issues; fixed by upgrading wpa_supplicant to v2.5

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209939

            Bug ID: 209939
           Summary: Wireless connectivity issues; fixed by upgrading
                    wpa_supplicant to v2.5
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: wireless
          Assignee: freebsd-wireless at FreeBSD.org
          Reporter: jeff at altometrics.com
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

I have a Lenovo T420 with the following wireless card (as reported by `pciconf
-lv`):

iwn0 at pci0:3:0:0:        class=0x028000 card=0x13118086 chip=0x00858086 rev=0x34
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Centrino Advanced-N 6205 [Taylor Peak]'
    class      = network

Although I am able to connect to some networks, I have had severe problems
connecting to my wireless router at home, which is an Asus RT-N66U, the "Dark
Knight" router. I have been able to connect once or twice, but usually the
connection fails for some reason. The relevant logs have a couple of repeating
patterns:

Authentication timed out:
May 29 19:00:27 taipei wpa_supplicant[343]: wlan0: Trying to associate with
10:bf:48:53:10:2c (SSID='Goat Net 5GHz' freq=5805 MHz)
May 29 19:00:37 taipei wpa_supplicant[343]: wlan0: Authentication with
10:bf:48:53:10:2c timed out.
May 29 19:00:37 taipei wpa_supplicant[343]: wlan0: CTRL-EVENT-DISCONNECTED
bssid=10:bf:48:53:10:2c reason=3 locally_generated=1

Associated, then immediately disconnected:
May 29 19:00:42 taipei wpa_supplicant[343]: wlan0: Trying to associate with
10:bf:48:53:10:2c (SSID='Goat Net 5GHz' freq=5805 MHz)
May 29 19:00:42 taipei wpa_supplicant[343]: wlan0: Associated with
10:bf:48:53:10:2c
May 29 19:00:42 taipei kernel: wlan0: link state changed to UP
May 29 19:00:43 taipei wpa_supplicant[343]: wlan0: CTRL-EVENT-DISCONNECTED
bssid=10:bf:48:53:10:2c reason=0
May 29 19:00:43 taipei kernel: wlan0: link state changed to DOWN

I haven't had any luck getting this to work with the stock wpa_supplicant,
which is at version 2.0.

However, I did install wpa_supplicant version 2.5 using pkg. It told me to add
a line to rc.conf to use the installed wpa_supplicant instead of the base one.
I rebooted, and my problems disappeared. I don't know why, but apparently the
newer version fixed some problem I was having.

Can we upgrade the base version of wpa_supplicant from 2.0 to 2.5?

I don't know what is involved in this, but if somebody will point me in the
right direction I may be able to help out.

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