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+<p class="description">
+  Here's the problem. I have a Dell Latitude E-series laptop running FreeBSD
+  12.1-RELEASE. I also have a Dell E-Port II docking station on my desk. I
+  wanted to be able to take my shut, sleeping laptop and plop it down on the
+  docking station, hit the dock power button, and have the laptop wake up and
+  switch over to all of the docking station peripherals. All of the USB devices
+  did this without any additional work. However, the ethernet hookup, external
+  monitor, and speakers all required some additional tinkering. This assumes
+  that you're already familiar with wired and wireless network interfaces on
+  FreeBSD!
+</p>
+
+<h2>Link Aggregation (Failover)</h2>
+
+<p>
+  FreeBSD doesn't magically swap from wireless to wired connections by default,
+  but there's an easy way to remedy this: link failover. I recommend reading the
+  <a href="https://www.freebsd.org/doc/handbook/network-aggregation.html"
+    >FreeBSD handbook page on network aggregation</a
+  >
+  as it's where I found out how to do what I'm about to show you. Basically,
+  aggregation lets you bind two of your network interfaces together into a
+  single virtual interface. Failover lets your traffic continue moving as long
+  as one of the aggregated interfaces has is connected. The steps I had to
+  follow are as follows:
+</p>
+
+<ul>
+  <li>
+    Bind the wireless network interface to the MAC address of the wired
+    interface
+  </li>
+  <li>Create a lagg interface using the two network interfaces</li>
+  <li>Bind the lagg interface to an IP address, preferably with DHCP</li>
+</ul>
+
+<p>All of this is configured in my <code>rc.conf</code>:</p>
+
+<pre><code>
+wlans_iwn0="wlan0" # <- wlan0 device should use the iwn driver
+ifconfig_wlan0="WPA" # <- wlan0 should use WPA (wpa_supplicant) to connect to wireless SSIDs
+create_args_wlan0="wlanaddr 5c:26:0a:06:c1:d6" # <- wlan0 MAC address is set to em0 device MAC address
+ifconfig_em0="up" # <- enable em0 (ethernet) device
+cloned_interfaces="lagg0" # <- create cloned interface lagg0
+ifconfig_lagg0="up laggproto failover laggport em0 laggport wlan0 DHCP" # <- configure lagg0 interface to act as a failover lagg protocol over em0 and wlan0
+</code></pre>
+
+<p>
+  In practice, the preferred device is <code>em0</code>, or my ethernet NIC.
+  FreeBSD will always try to use that first. If it's disconnected, such as when
+  the laptop is removed from the dock, the wireless device (<code>wlan0</code>)
+  will take over. This transition happens instantly, and without interrupting
+  traffic; active transactions aren't cut short for example.
+</p>