Forward ports can specify host/guest IP to bind to [GH-1121]

CHANGELOG.md

@@ -12,6 +12,7 @@ IMPROVEMENTS:
     box exists only backed by one provider. [GH-1032]
   - `vagrant destroy` returns exit status 1 if any of the confirmations
     are declined. [GH-923]
+  - Forwarded ports can specify a host IP and guest IP to bind to. [GH-1121]
 
 BUG FIXES:
 

plugins/providers/virtualbox/driver/version_4_0.rb

@@ -142,9 +142,9 @@ module VagrantPlugins
           ports.each do |options|
             pf_builder = [options[:name],
               options[:protocol] || "tcp",
-              "",
+              options[:hostip] || "",
               options[:hostport],
-              "",
+              options[:guestip] || "",
               options[:guestport]]
 
             args.concat(["--natpf#{options[:adapter] || 1}",

plugins/providers/virtualbox/driver/version_4_1.rb

@@ -142,9 +142,9 @@ module VagrantPlugins
           ports.each do |options|
             pf_builder = [options[:name],
               options[:protocol] || "tcp",
-              "",
+              options[:hostip] || "",
               options[:hostport],
-              "",
+              options[:guestip] || "",
               options[:guestport]]
 
             args.concat(["--natpf#{options[:adapter] || 1}",