Bug ID: 198680
           Summary: [ath] Specifying "mode 11ng" breaks client
                    connectivity with ath(4)
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: wireless

Version: 11.0-CURRENT FreeBSD 11.0-CURRENT #0 r279813: Mon Mar  9 16:31:08 UTC

Configure an ath card as a client with "mode 11ng" specified, and it doesn't
work. For instance, this rc.conf: 

ifconfig_ath0_wlan0="mode 11ng ssid test_network DHCP"

The interface ends up endlessly stuck at "no carrier". 
mtu 1500
    ether 00:80:48:79:99:f2
    inet6 fe80::280:48ff:fe79:99f2%ath0_wlan0 prefixlen 64 scopeid 0x6 
    media: IEEE 802.11 Wireless Ethernet autoselect mode 11ng (autoselect)
    status: no carrier
    ssid test_network channel 1 (2412 MHz 11b)
    country US ecm authmode OPEN privacy OFF txpower 27 bmiss 7
    scanvalid 60 wme burst bintval 0
    groups: wlan 

Run ifconfig more, and you'll see the channel continues to change over and
over. A small sampling: 

    ssid test_network channel 1 (2412 MHz 11g)
    ssid test_network channel 3 (2422 MHz 11g)
    ssid test_network channel 44 (5220 MHz 11a)
    ssid test_network channel 9 (2452 MHz 11g)

It ends up stuck in that state indefinitely. Remove "mode 11ng" from the
ifconfig line in rc.conf, 'service netif restart', and it works.

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