Better than a note on the readme is a warning for users about unsupported private / public networks :)

Closes GH-154

CHANGELOG.md

@@ -1,5 +1,9 @@
 ## [0.6.5](https://github.com/fgrehm/vagrant-lxc/compare/v0.6.4...master) (unreleased)
 
+IMPROVEMENTS:
+
+  - Warn users about unsupported private / public networking configs [#154](https://github.com/fgrehm/vagrant-lxc/issues/154)
+
 BUG FIXES:
 
   - Error out in case an invalid IPs are provided for forwarded ports [#170](https://github.com/fgrehm/vagrant-lxc/issues/170)

lib/vagrant-lxc/action.rb

@@ -18,6 +18,7 @@ require 'vagrant-lxc/action/message'
 require 'vagrant-lxc/action/remove_temporary_files'
 require 'vagrant-lxc/action/setup_package_files'
 require 'vagrant-lxc/action/share_folders'
+require 'vagrant-lxc/action/warn_networks'
 
 unless Vagrant::LXC.vagrant_1_3_or_later
   require 'vagrant-lxc/action/wait_for_communicator'
@@ -58,6 +59,7 @@ module Vagrant
           b.use Builtin::HandleForwardedPortCollisions
           b.use ShareFolders
           b.use Builtin::SetHostname
+          b.use WarnNetworks
           b.use ForwardPorts
           b.use Boot
           b.use Builtin::WaitForCommunicator

lib/vagrant-lxc/action/warn_networks.rb

@@ -0,0 +1,25 @@
+module Vagrant
+  module LXC
+    module Action
+      class WarnNetworks
+        def initialize(app, env)
+          @app = app
+        end
+
+        def call(env)
+          if public_or_private_network_configured?
+            env[:ui].warn(I18n.t("vagrant_lxc.messages.warn_networks"))
+          end
+
+          @app.call(env)
+        end
+
+        def public_or_private_network_configured?
+          config.vm.networks.find do |type|
+            [:private_network, :public_network].include?(type.to_sym)
+          end
+        end
+      end
+    end
+  end
+end

locales/en.yml

@@ -17,6 +17,10 @@ en:
         Waiting for container to start. This should not take long.
       container_ready: |-
         Container started and ready for use!
+      warn_networks: |-
+        Warning! The LXC provider doesn't support any of the Vagrant public / private
+        network configurations (`config.vm.network :private_network, ip: "some-ip"`).
+        They will be silently ignored.
 
   vagrant:
     commands: