Support offline update of oui.txt and MIBs bundle

Netdisco/lib/App/Netdisco.pm

@@ -212,7 +212,9 @@ take care of all this for you:
 
  ~/bin/netdisco-deploy
 
-If this is a new installation of Netdisco 2, answer yes to all questions.
+If this is a new installation of Netdisco 2, answer yes to all questions. If
+you wish to deploy without Internet access, see the
+L<Deployment|App::Netdisco::Manual::Deployment> documentation.
 
 =head1 Startup
 

Netdisco/lib/App/Netdisco/Manual/Deployment.pod

@@ -28,6 +28,32 @@ the database service):
  # TYPE  DATABASE  USER  ADDRESS       METHOD
  host    all       all   127.0.0.1/32  md5
 
+=head1 Deploy without Internet access
+
+The C<netdisco-deploy> script asks for Internet access but it is possible to
+install off-line. You should download the following two files:
+
+=over 4
+
+=item *
+
+http://standards.ieee.org/develop/regauth/oui/oui.txt
+
+=item *
+
+http://downloads.sourceforge.net/project/netdisco/netdisco-mibs/latest-snapshot/netdisco-mibs-snapshot.tar.gz
+
+=back
+
+Run the C<netdisco-deploy> script but pass the OUI file name as a parameter on
+the command line:
+
+ ~/bin/netdisco-deploy ./oui.txt
+
+Then answer yes to questions, even though you're not connected to the
+Internet. For the MIBs you can simply extract the downloaded archive to the
+home directory of Netdisco.
+
 =head1 Relocating the Installation
 
 The installation process installs Netdisco self-contained to your home