Port forwarding definitions with the same guest port will override earlier

lib/vagrant/action/vm/forward_ports.rb

@@ -12,19 +12,37 @@ module Vagrant
         def call(env)
           @env = env
 
+          # Get the ports we're forwarding
+          ports = forward_port_definitions
+
           # Warn if we're port forwarding to any privileged ports...
-          threshold_check
+          threshold_check(ports)
 
           env[:ui].info I18n.t("vagrant.actions.vm.forward_ports.forwarding")
-          forward_ports(env[:vm])
+          forward_ports(ports)
 
           @app.call(env)
         end
 
+        # This returns an array of forwarded ports with overrides properly
+        # squashed.
+        def forward_port_definitions
+          # Get all the port mappings in the order they're defined and
+          # organize them by their guestport, taking the "last one wins"
+          # approach.
+          guest_port_mapping = {}
+          @env[:vm].config.vm.forwarded_ports.each do |options|
+            guest_port_mapping[options[:guestport]] = options
+          end
+
+          # Return the values, since the order doesn't really matter
+          guest_port_mapping.values
+        end
+
         # This method checks for any forwarded ports on the host below
         # 1024, which causes the forwarded ports to fail.
-        def threshold_check
-          @env[:vm].config.vm.forwarded_ports.each do |options|
+        def threshold_check(ports)
+          ports.each do |options|
             if options[:hostport] <= 1024
               @env[:ui].warn I18n.t("vagrant.actions.vm.forward_ports.privileged_ports")
               return
@@ -32,12 +50,12 @@ module Vagrant
           end
         end
 
-        def forward_ports(vm)
+        def forward_ports(mappings)
           ports = []
 
           interfaces = @env[:vm].driver.read_network_interfaces
 
-          @env[:vm].config.vm.forwarded_ports.each do |options|
+          mappings.each do |options|
             message_attributes = {
               :guest_port => options[:guestport],
               :host_port => options[:hostport],