[Bug 258734] lagg man page should not promote setting MAC on wireless interfaces

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258734

            Bug ID: 258734
           Summary: lagg man page should not promote setting MAC on
                    wireless interfaces
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: jwb@freebsd.org

I just noticed the following in the lagg man page:

     The following example uses an active failover interface to set up roaming
     between wired and wireless networks using two network devices.  Whenever
     the wired master interface is unplugged, the wireless failover device
     will be used:

           # ifconfig em0 up
           # ifconfig ath0 ether 00:11:22:33:44:55
           # ifconfig create wlan0 wlandev ath0 ssid my_net up
           # ifconfig lagg0 create
           # ifconfig lagg0 laggproto failover laggport em0 laggport wlan0 \
                   192.168.1.1 netmask 255.255.255.0

     (Note the mac address of the wireless device is forced to match the wired
     device as a workaround.)

We had a discussion a while back about some non-working Wifi failover
configurations and someone discovered that certain popular WiFi devices do not
support overriding the MAC address.

Overriding the MAC of the Ethernet interface seems to work more universally.

This is what auto-wifi-failover (part of sysutils/auto-admin) now does.

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