What is the network interface 'llw0'? An interface called llw0 shows up in ifconfig and has the same IPv6 address (different scopeid) and hardware address as awdl0:
awdl0: flags=8943&lt;UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST&gt; mtu 1484
   options=400&lt;CHANNEL_IO&gt;
   ether 42:f8:7a:c4:5a:b6
   inet6 fe80::e8de:dfa2:fe4f:f1e%awdl0 prefixlen 64 scopeid 0xd
   nd6 options=201&lt;PERFORMNUD,DAD&gt;
   media: autoselect
   status: active
llw0: flags=8863&lt;UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST&gt; mtu 1500
   options=400&lt;CHANNEL_IO&gt;
   ether 42:f8:7a:c4:5a:b6
   inet6 fe80::e8de:dfa2:fe4f:f1e%llw0 prefixlen 64 scopeid 0xe
   nd6 options=201&lt;PERFORMNUD,DAD&gt;
   media: autoselect
   status: active

awdl0 is Apple Wireless Direct Link, but what is llw0?
llw is a WLAN low-latency interface, and llw0 is simply the first of those.
The llw interface is a network interface that comes from a nexus defined in the Skywalk system. You can look it up like this:
skywalkctl list-providers | grep llw

You'll see that it is handled by a BCM &quot;driver&quot; (i.e. an IC in your computer manufactured by Broadcom).
The interface is supposed to be there - it is not a bug.
Similar to how awdl (that you mention) is a special kind of WiFi connection that is peer-to-peer and low-latency (used for AirDrop for example) - llw is also a special kind of WiFi connection that is low-latency (no power saves allowed), but with an access point.