Merge pull request #1585 from vyos/mergify/bp/sagitta/pr-1584

installation: add note about unsupported locally administered MAC addresses (backport #1584)

docs/installation/index.rst

@@ -2,7 +2,16 @@
 Installation and Image Management
 #################################
 
+.. note:: This is most likely only relevant for virtual installations:
 
+   When installing VyOS ensure that the MAC address selected for your NICs is
+   not a locally administered MAC address. Locally administered addresses are
+   distinguished from universally administered addresses by setting (assigning
+   the value of 1 to) the second-least-significant bit of the first octet of
+   the address:
+
+   Example: ``02:00:00:00:00:01``, where the second-least-significant bit
+   (``02`` in hex) is set to ``1``.
 
 .. toctree::
    :maxdepth: 2