diff --git a/lib/vagrant/util/network_ip.rb b/lib/vagrant/util/network_ip.rb
index fca98f8b4..5f22f69d4 100644
--- a/lib/vagrant/util/network_ip.rb
+++ b/lib/vagrant/util/network_ip.rb
@@ -1,10 +1,21 @@
+require "ipaddr"
+
 module Vagrant
   module Util
     module NetworkIP
       # Returns the network address of the given IP and subnet.
       #
+      # If the IP address is an IPv6 address, subnet should be a prefix
+      # length such as "64".
+      #
       # @return [String]
       def network_address(ip, subnet)
+        # If this is an IPv6 address, then just mask it
+        if subnet.to_s =~ /^\d+$/
+          ip = IPAddr.new(ip)
+          return ip.mask(subnet.to_i).to_s
+        end
+
         ip      = ip_parts(ip)
         netmask = ip_parts(subnet)
 
diff --git a/plugins/providers/virtualbox/action.rb b/plugins/providers/virtualbox/action.rb
index 83eb3aec9..0d8fc8e38 100644
--- a/plugins/providers/virtualbox/action.rb
+++ b/plugins/providers/virtualbox/action.rb
@@ -30,6 +30,7 @@ module VagrantPlugins
       autoload :MessageNotRunning, File.expand_path("../action/message_not_running", __FILE__)
       autoload :MessageWillNotDestroy, File.expand_path("../action/message_will_not_destroy", __FILE__)
       autoload :Network, File.expand_path("../action/network", __FILE__)
+      autoload :NetworkFixIPv6, File.expand_path("../action/network_fix_ipv6", __FILE__)
       autoload :Package, File.expand_path("../action/package", __FILE__)
       autoload :PackageVagrantfile, File.expand_path("../action/package_vagrantfile", __FILE__)
       autoload :PrepareNFSSettings, File.expand_path("../action/prepare_nfs_settings", __FILE__)
@@ -63,6 +64,7 @@ module VagrantPlugins
           b.use PrepareNFSSettings
           b.use ClearNetworkInterfaces
           b.use Network
+          b.use NetworkFixIPv6
           b.use ForwardPorts
           b.use SetHostname
           b.use SaneDefaults
diff --git a/plugins/providers/virtualbox/action/network.rb b/plugins/providers/virtualbox/action/network.rb
index 3697cdfef..cf5ca3b47 100644
--- a/plugins/providers/virtualbox/action/network.rb
+++ b/plugins/providers/virtualbox/action/network.rb
@@ -1,3 +1,4 @@
+require "ipaddr"
 require "set"
 
 require "log4r"
@@ -248,7 +249,6 @@ module VagrantPlugins
             auto_config: true,
             mac:         nil,
             nic_type:    nil,
-            netmask:     "255.255.255.0",
             type:        :static
           }.merge(options)
 
@@ -258,31 +258,47 @@ module VagrantPlugins
           # Default IP is in the 20-bit private network block for DHCP based networks
           options[:ip] = "172.28.128.1" if options[:type] == :dhcp && !options[:ip]
 
-          # Calculate our network address for the given IP/netmask
-          netaddr  = network_address(options[:ip], options[:netmask])
+          ip = IPAddr.new(options[:ip])
+          if ip.ipv4?
+            options[:netmask] ||= "255.255.255.0"
 
-          # Verify that a host-only network subnet would not collide
-          # with a bridged networking interface.
-          #
-          # If the subnets overlap in any way then the host only network
-          # will not work because the routing tables will force the
-          # traffic onto the real interface rather than the VirtualBox
-          # interface.
-          @env[:machine].provider.driver.read_bridged_interfaces.each do |interface|
-            that_netaddr = network_address(interface[:ip], interface[:netmask])
-            raise Vagrant::Errors::NetworkCollision if \
-              netaddr == that_netaddr && interface[:status] != "Down"
+            # Calculate our network address for the given IP/netmask
+            netaddr  = network_address(options[:ip], options[:netmask])
+
+            # Verify that a host-only network subnet would not collide
+            # with a bridged networking interface.
+            #
+            # If the subnets overlap in any way then the host only network
+            # will not work because the routing tables will force the
+            # traffic onto the real interface rather than the VirtualBox
+            # interface.
+            @env[:machine].provider.driver.read_bridged_interfaces.each do |interface|
+              that_netaddr = network_address(interface[:ip], interface[:netmask])
+              raise Vagrant::Errors::NetworkCollision if \
+                netaddr == that_netaddr && interface[:status] != "Down"
+            end
+
+            # Split the IP address into its components
+            ip_parts = netaddr.split(".").map { |i| i.to_i }
+
+            # Calculate the adapter IP, which we assume is the IP ".1" at
+            # the end usually.
+            adapter_ip    = ip_parts.dup
+            adapter_ip[3] += 1
+            options[:adapter_ip] ||= adapter_ip.join(".")
+          elsif ip.ipv6?
+            # Default subnet prefix length
+            options[:netmask] ||= 64
+
+            # IPv6 we just mask the address and use that as the adapter
+            options[:adapter_ip] ||= ip.mask(options[:netmask].to_i).to_s
+
+            # Append a 6 to the end of the type
+            options[:type] = "#{options[:type]}6".to_sym
+          else
+            raise "BUG: Unknown IP type: #{ip.inspect}"
           end
 
-          # Split the IP address into its components
-          ip_parts = netaddr.split(".").map { |i| i.to_i }
-
-          # Calculate the adapter IP, which we assume is the IP ".1" at
-          # the end usually.
-          adapter_ip    = ip_parts.dup
-          adapter_ip[3] += 1
-          options[:adapter_ip] ||= adapter_ip.join(".")
-
           dhcp_options = {}
           if options[:type] == :dhcp
             # Calculate the DHCP server IP, which is the network address
@@ -456,8 +472,16 @@ module VagrantPlugins
 
           @env[:machine].provider.driver.read_host_only_interfaces.each do |interface|
             return interface if config[:name] && config[:name] == interface[:name]
-            return interface if this_netaddr == \
-              network_address(interface[:ip], interface[:netmask])
+
+            if interface[:ip] != ""
+              return interface if this_netaddr == \
+                network_address(interface[:ip], interface[:netmask])
+            end
+
+            if interface[:ipv6] != ""
+              return interface if this_netaddr == \
+                network_address(interface[:ipv6], interface[:ipv6_prefix])
+            end
           end
 
           nil
diff --git a/plugins/providers/virtualbox/action/network_fix_ipv6.rb b/plugins/providers/virtualbox/action/network_fix_ipv6.rb
new file mode 100644
index 000000000..eb4ca48ef
--- /dev/null
+++ b/plugins/providers/virtualbox/action/network_fix_ipv6.rb
@@ -0,0 +1,64 @@
+require "ipaddr"
+require "socket"
+
+require "log4r"
+
+require "vagrant/util/scoped_hash_override"
+
+module VagrantPlugins
+  module ProviderVirtualBox
+    module Action
+      # This middleware works around a bug in VirtualBox where booting
+      # a VM with an IPv6 host-only network will someties lose the
+      # route to that machine.
+      class NetworkFixIPv6
+        include Vagrant::Util::ScopedHashOverride
+
+        def initialize(app, env)
+          @logger = Log4r::Logger.new("vagrant::plugins::virtualbox::network")
+          @app    = app
+        end
+
+        def call(env)
+          @env = env
+
+          # Determine if we have an IPv6 network
+          has_v6 = false
+          env[:machine].config.vm.networks.each do |type, options|
+            next if type != :private_network
+            options = scoped_hash_override(options, :virtualbox)
+            next if options[:ip] == ""
+            if IPAddr.new(options[:ip]).ipv6?
+              has_v6 = true
+              break
+            end
+          end
+
+          # Call up
+          @app.call(env)
+
+          # If we have no IPv6, forget it
+          return if !has_v6
+
+          # We do, so fix them if we must
+          env[:machine].provider.driver.read_host_only_interfaces.each do |interface|
+            # Ignore interfaces without an IPv6 address
+            next if interface[:ipv6] == ""
+
+            # Make the test IP. This is just the highest value IP
+            ip = IPAddr.new(interface[:ipv6])
+            ip |= IPAddr.new(":#{":FFFF" * (interface[:ipv6_prefix].to_i / 16)}")
+
+            @logger.info("testing IPv6: #{ip}")
+            begin
+              UDPSocket.new(Socket::AF_INET6).connect(ip.to_s, 80)
+            rescue Errno::EHOSTUNREACH
+              @logger.info("IPv6 host unreachable. Fixing: #{ip}")
+              env[:machine].provider.driver.reconfig_host_only(interface)
+            end
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/plugins/providers/virtualbox/driver/base.rb b/plugins/providers/virtualbox/driver/base.rb
index 112e97d5b..768bd9cef 100644
--- a/plugins/providers/virtualbox/driver/base.rb
+++ b/plugins/providers/virtualbox/driver/base.rb
@@ -263,6 +263,14 @@ module VagrantPlugins
         def read_vms
         end
 
+        # Reconfigure the hostonly network given by interface (the result
+        # of read_host_only_networks). This is a sad function that only
+        # exists to work around VirtualBox bugs.
+        #
+        # @return nil
+        def reconfig_host_only(interface)
+        end
+
         # Removes the DHCP server identified by the provided network name.
         #
         # @param [String] network_name The the full network name associated
diff --git a/plugins/providers/virtualbox/driver/meta.rb b/plugins/providers/virtualbox/driver/meta.rb
index 10bef3f8f..242372452 100644
--- a/plugins/providers/virtualbox/driver/meta.rb
+++ b/plugins/providers/virtualbox/driver/meta.rb
@@ -109,6 +109,7 @@ module VagrantPlugins
           :read_state,
           :read_used_ports,
           :read_vms,
+          :reconfig_host_only,
           :remove_dhcp_server,
           :resume,
           :set_mac_address,
diff --git a/plugins/providers/virtualbox/driver/version_4_0.rb b/plugins/providers/virtualbox/driver/version_4_0.rb
index 53361bbbb..66e9a37be 100644
--- a/plugins/providers/virtualbox/driver/version_4_0.rb
+++ b/plugins/providers/virtualbox/driver/version_4_0.rb
@@ -48,10 +48,19 @@ module VagrantPlugins
           interface = execute("hostonlyif", "create")
           name = interface[/^Interface '(.+?)' was successfully created$/, 1]
 
-          # Configure it
-          execute("hostonlyif", "ipconfig", name,
-                  "--ip", options[:adapter_ip],
-                  "--netmask", options[:netmask])
+          # Get the IP so we can determine v4 vs v6
+          ip = IPAddr.new(options[:adapter_ip])
+
+          # Configure
+          if ip.ipv4?
+            execute("hostonlyif", "ipconfig", name,
+                    "--ip", options[:adapter_ip],
+                    "--netmask", options[:netmask])
+          elsif ip.ipv6?
+            execute("hostonlyif", "ipconfig", name,
+                    "--ipv6", options[:adapter_ip],
+                    "--netmasklengthv6", options[:netmask].to_s)
+          end
 
           # Return the details
           return {
@@ -320,6 +329,10 @@ module VagrantPlugins
                 info[:ip] = ip
               elsif netmask = line[/^NetworkMask:\s+(.+?)$/, 1]
                 info[:netmask] = netmask
+              elsif line =~ /^IPV6Address:\s+(.+?)$/
+                info[:ipv6] = $1.to_s.strip
+              elsif line =~ /^IPV6NetworkMaskPrefixLength:\s+(.+?)$/
+                info[:ipv6_prefix] = $1.to_s.strip
               elsif status = line[/^Status:\s+(.+?)$/, 1]
                 info[:status] = status
               end
@@ -429,6 +442,11 @@ module VagrantPlugins
           results
         end
 
+        def reconfig_host_only(interface)
+          execute("hostonlyif", "ipconfig", interface[:name],
+                  "--ipv6", interface[:ipv6])
+        end
+
         def remove_dhcp_server(network_name)
           execute("dhcpserver", "remove", "--netname", network_name)
         end
diff --git a/plugins/providers/virtualbox/driver/version_4_1.rb b/plugins/providers/virtualbox/driver/version_4_1.rb
index ae1830019..8830297ba 100644
--- a/plugins/providers/virtualbox/driver/version_4_1.rb
+++ b/plugins/providers/virtualbox/driver/version_4_1.rb
@@ -48,10 +48,19 @@ module VagrantPlugins
           interface = execute("hostonlyif", "create")
           name = interface[/^Interface '(.+?)' was successfully created$/, 1]
 
-          # Configure it
-          execute("hostonlyif", "ipconfig", name,
-                  "--ip", options[:adapter_ip],
-                  "--netmask", options[:netmask])
+          # Get the IP so we can determine v4 vs v6
+          ip = IPAddr.new(options[:adapter_ip])
+
+          # Configure
+          if ip.ipv4?
+            execute("hostonlyif", "ipconfig", name,
+                    "--ip", options[:adapter_ip],
+                    "--netmask", options[:netmask])
+          elsif ip.ipv6?
+            execute("hostonlyif", "ipconfig", name,
+                    "--ipv6", options[:adapter_ip],
+                    "--netmasklengthv6", options[:netmask].to_s)
+          end
 
           # Return the details
           return {
@@ -325,6 +334,10 @@ module VagrantPlugins
                 info[:ip] = ip
               elsif netmask = line[/^NetworkMask:\s+(.+?)$/, 1]
                 info[:netmask] = netmask
+              elsif line =~ /^IPV6Address:\s+(.+?)$/
+                info[:ipv6] = $1.to_s.strip
+              elsif line =~ /^IPV6NetworkMaskPrefixLength:\s+(.+?)$/
+                info[:ipv6_prefix] = $1.to_s.strip
               elsif status = line[/^Status:\s+(.+?)$/, 1]
                 info[:status] = status
               end
@@ -434,6 +447,11 @@ module VagrantPlugins
           results
         end
 
+        def reconfig_host_only(interface)
+          execute("hostonlyif", "ipconfig", interface[:name],
+                  "--ipv6", interface[:ipv6])
+        end
+
         def remove_dhcp_server(network_name)
           execute("dhcpserver", "remove", "--netname", network_name)
         end
diff --git a/plugins/providers/virtualbox/driver/version_4_2.rb b/plugins/providers/virtualbox/driver/version_4_2.rb
index dc7da430a..0f1f79698 100644
--- a/plugins/providers/virtualbox/driver/version_4_2.rb
+++ b/plugins/providers/virtualbox/driver/version_4_2.rb
@@ -46,12 +46,21 @@ module VagrantPlugins
         def create_host_only_network(options)
           # Create the interface
           execute("hostonlyif", "create") =~ /^Interface '(.+?)' was successfully created$/
-            name = $1.to_s
+          name = $1.to_s
 
-          # Configure it
-          execute("hostonlyif", "ipconfig", name,
-                  "--ip", options[:adapter_ip],
-                  "--netmask", options[:netmask])
+          # Get the IP so we can determine v4 vs v6
+          ip = IPAddr.new(options[:adapter_ip])
+
+          # Configure
+          if ip.ipv4?
+            execute("hostonlyif", "ipconfig", name,
+                    "--ip", options[:adapter_ip],
+                    "--netmask", options[:netmask])
+          elsif ip.ipv6?
+            execute("hostonlyif", "ipconfig", name,
+                    "--ipv6", options[:adapter_ip],
+                    "--netmasklengthv6", options[:netmask].to_s)
+          end
 
           # Return the details
           return {
@@ -356,6 +365,10 @@ module VagrantPlugins
                 info[:ip] = $1.to_s
               elsif line =~ /^NetworkMask:\s+(.+?)$/
                 info[:netmask] = $1.to_s
+              elsif line =~ /^IPV6Address:\s+(.+?)$/
+                info[:ipv6] = $1.to_s.strip
+              elsif line =~ /^IPV6NetworkMaskPrefixLength:\s+(.+?)$/
+                info[:ipv6_prefix] = $1.to_s.strip
               elsif line =~ /^Status:\s+(.+?)$/
                 info[:status] = $1.to_s
               end
@@ -465,6 +478,11 @@ module VagrantPlugins
           results
         end
 
+        def reconfig_host_only(interface)
+          execute("hostonlyif", "ipconfig", interface[:name],
+                  "--ipv6", interface[:ipv6])
+        end
+
         def remove_dhcp_server(network_name)
           execute("dhcpserver", "remove", "--netname", network_name)
         end
diff --git a/plugins/providers/virtualbox/driver/version_4_3.rb b/plugins/providers/virtualbox/driver/version_4_3.rb
index b421e7911..3b08d43cd 100644
--- a/plugins/providers/virtualbox/driver/version_4_3.rb
+++ b/plugins/providers/virtualbox/driver/version_4_3.rb
@@ -1,3 +1,4 @@
+require 'ipaddr'
 require 'log4r'
 
 require "vagrant/util/platform"
@@ -46,12 +47,21 @@ module VagrantPlugins
         def create_host_only_network(options)
           # Create the interface
           execute("hostonlyif", "create") =~ /^Interface '(.+?)' was successfully created$/
-            name = $1.to_s
+          name = $1.to_s
 
-          # Configure it
-          execute("hostonlyif", "ipconfig", name,
-                  "--ip", options[:adapter_ip],
-                  "--netmask", options[:netmask])
+          # Get the IP so we can determine v4 vs v6
+          ip = IPAddr.new(options[:adapter_ip])
+
+          # Configure
+          if ip.ipv4?
+            execute("hostonlyif", "ipconfig", name,
+                    "--ip", options[:adapter_ip],
+                    "--netmask", options[:netmask])
+          elsif ip.ipv6?
+            execute("hostonlyif", "ipconfig", name,
+                    "--ipv6", options[:adapter_ip],
+                    "--netmasklengthv6", options[:netmask].to_s)
+          end
 
           # Return the details
           return {
@@ -62,6 +72,11 @@ module VagrantPlugins
           }
         end
 
+        def reconfig_host_only(interface)
+          execute("hostonlyif", "ipconfig", interface[:name],
+                  "--ipv6", interface[:ipv6])
+        end
+
         def delete
           execute("unregistervm", @uuid, "--delete")
         end
@@ -366,6 +381,10 @@ module VagrantPlugins
                 info[:ip] = $1.to_s
               elsif line =~ /^NetworkMask:\s+(.+?)$/
                 info[:netmask] = $1.to_s
+              elsif line =~ /^IPV6Address:\s+(.+?)$/
+                info[:ipv6] = $1.to_s.strip
+              elsif line =~ /^IPV6NetworkMaskPrefixLength:\s+(.+?)$/
+                info[:ipv6_prefix] = $1.to_s.strip
               elsif line =~ /^Status:\s+(.+?)$/
                 info[:status] = $1.to_s
               end
diff --git a/plugins/providers/virtualbox/driver/version_5_0.rb b/plugins/providers/virtualbox/driver/version_5_0.rb
index 102d838bc..3c84ad3c7 100644
--- a/plugins/providers/virtualbox/driver/version_5_0.rb
+++ b/plugins/providers/virtualbox/driver/version_5_0.rb
@@ -46,12 +46,23 @@ module VagrantPlugins
         def create_host_only_network(options)
           # Create the interface
           execute("hostonlyif", "create") =~ /^Interface '(.+?)' was successfully created$/
-            name = $1.to_s
+          name = $1.to_s
 
-          # Configure it
-          execute("hostonlyif", "ipconfig", name,
-                  "--ip", options[:adapter_ip],
-                  "--netmask", options[:netmask])
+          # Get the IP so we can determine v4 vs v6
+          ip = IPAddr.new(options[:adapter_ip])
+
+          # Configure
+          if ip.ipv4?
+            execute("hostonlyif", "ipconfig", name,
+                    "--ip", options[:adapter_ip],
+                    "--netmask", options[:netmask])
+          elsif ip.ipv6?
+            execute("hostonlyif", "ipconfig", name,
+                    "--ipv6", options[:adapter_ip],
+                    "--netmasklengthv6", options[:netmask].to_s)
+          else
+            raise "BUG: Unknown IP type: #{ip.inspect}"
+          end
 
           # Return the details
           return {
@@ -366,6 +377,10 @@ module VagrantPlugins
                 info[:ip] = $1.to_s
               elsif line =~ /^NetworkMask:\s+(.+?)$/
                 info[:netmask] = $1.to_s
+              elsif line =~ /^IPV6Address:\s+(.+?)$/
+                info[:ipv6] = $1.to_s.strip
+              elsif line =~ /^IPV6NetworkMaskPrefixLength:\s+(.+?)$/
+                info[:ipv6_prefix] = $1.to_s.strip
               elsif line =~ /^Status:\s+(.+?)$/
                 info[:status] = $1.to_s
               end
@@ -475,6 +490,11 @@ module VagrantPlugins
           results
         end
 
+        def reconfig_host_only(interface)
+          execute("hostonlyif", "ipconfig", interface[:name],
+                  "--ipv6", interface[:ipv6])
+        end
+
         def remove_dhcp_server(network_name)
           execute("dhcpserver", "remove", "--netname", network_name)
         end
diff --git a/templates/guests/debian/network_static6.erb b/templates/guests/debian/network_static6.erb
new file mode 100644
index 000000000..7b9e8a694
--- /dev/null
+++ b/templates/guests/debian/network_static6.erb
@@ -0,0 +1,10 @@
+#VAGRANT-BEGIN
+# The contents below are automatically generated by Vagrant. Do not modify.
+auto eth<%= options[:interface] %>
+iface eth<%= options[:interface] %> inet6 static
+      address <%= options[:ip] %>
+      netmask <%= options[:netmask] %>
+<% if options[:gateway] %>
+      gateway <%= options[:gateway] %>
+<% end %>
+#VAGRANT-END
diff --git a/test/unit/plugins/providers/virtualbox/support/shared/virtualbox_driver_version_4_x_examples.rb b/test/unit/plugins/providers/virtualbox/support/shared/virtualbox_driver_version_4_x_examples.rb
index 88f199a82..85dee3cb1 100644
--- a/test/unit/plugins/providers/virtualbox/support/shared/virtualbox_driver_version_4_x_examples.rb
+++ b/test/unit/plugins/providers/virtualbox/support/shared/virtualbox_driver_version_4_x_examples.rb
@@ -159,6 +159,7 @@ shared_examples "a version 4.x virtualbox driver" do |options|
           name:    'vboxnet0',
           ip:      '172.28.128.1',
           netmask: '255.255.255.0',
+          ipv6_prefix: '0',
           status:  'Up',
         }])
       end
@@ -196,11 +197,40 @@ shared_examples "a version 4.x virtualbox driver" do |options|
 
       it "returns a list with one entry for each interface" do
         expect(subject.read_host_only_interfaces).to eq([
-          {name: 'vboxnet0', ip: '172.28.128.1', netmask: '255.255.255.0', status: 'Up'},
-          {name: 'vboxnet1', ip: '10.0.0.1', netmask: '255.255.255.0', status: 'Up'},
+          {name: 'vboxnet0', ip: '172.28.128.1', netmask: '255.255.255.0', ipv6_prefix: "0", status: 'Up'},
+          {name: 'vboxnet1', ip: '10.0.0.1', netmask: '255.255.255.0', ipv6_prefix: "0", status: 'Up'},
         ])
       end
     end
+
+    context "with an IPv6 host-only interface" do
+      let(:output) {
+        <<-OUTPUT.gsub(/^ */, '')
+          Name:            vboxnet1
+          GUID:            786f6276-656e-4174-8000-0a0027000001
+          DHCP:            Disabled
+          IPAddress:       192.168.57.1
+          NetworkMask:     255.255.255.0
+          IPV6Address:     fde4:8dba:82e1::
+          IPV6NetworkMaskPrefixLength: 64
+          HardwareAddress: 0a:00:27:00:00:01
+          MediumType:      Ethernet
+          Status:          Up
+          VBoxNetworkName: HostInterfaceNetworking-vboxnet1
+        OUTPUT
+      }
+
+      it "returns a list with one entry describing that interface" do
+        expect(subject.read_host_only_interfaces).to eq([{
+          name:    'vboxnet1',
+          ip:      '192.168.57.1',
+          netmask: '255.255.255.0',
+          ipv6: 'fde4:8dba:82e1::',
+          ipv6_prefix: '64',
+          status:  'Up',
+        }])
+      end
+    end
   end
 
   describe "remove_dhcp_server" do
diff --git a/test/unit/vagrant/util/network_ip_test.rb b/test/unit/vagrant/util/network_ip_test.rb
index a4ff8944c..9d0d09b12 100644
--- a/test/unit/vagrant/util/network_ip_test.rb
+++ b/test/unit/vagrant/util/network_ip_test.rb
@@ -13,5 +13,17 @@ describe Vagrant::Util::NetworkIP do
     it "calculates it properly" do
       expect(klass.network_address("192.168.2.234", "255.255.255.0")).to eq("192.168.2.0")
     end
+
+    it "calculates it properly with integer submask" do
+      expect(klass.network_address("192.168.2.234", "24")).to eq("192.168.2.0")
+    end
+
+    it "calculates it properly for IPv6" do
+      expect(klass.network_address("fde4:8dba:82e1::c4", "64")).to eq("fde4:8dba:82e1::")
+    end
+
+    it "calculates it properly for IPv6" do
+      expect(klass.network_address("fde4:8dba:82e1::c4", 64)).to eq("fde4:8dba:82e1::")
+    end
   end
 end
diff --git a/website/docs/source/v2/networking/private_network.html.md b/website/docs/source/v2/networking/private_network.html.md
index 345547f05..e11c7b3c7 100644
--- a/website/docs/source/v2/networking/private_network.html.md
+++ b/website/docs/source/v2/networking/private_network.html.md
@@ -74,6 +74,35 @@ reachable.
 </p>
 </div>
 
+## IPv6
+
+You can specify a static IP via IPv6. DHCP for IPv6 is not supported.
+To use IPv6, just specify an IPv6 address as the IP:
+
+```ruby
+Vagrant.configure("2") do |config|
+  config.vm.network "private_network", ip: "fde4:8dba:82e1::c4"
+end
+```
+
+This will assign that IP to the machine. The entire `/64` subnet will
+be reserved. Please make sure to use the reserved local addresses approved
+for IPv6.
+
+You can also modify the prefix length by changing the `netmask` option
+(defaults to 64):
+
+```ruby
+Vagrant.configure("2") do |config|
+  config.vm.network "private_network",
+    ip: "fde4:8dba:82e1::c4",
+    netmask: "96"
+end
+```
+
+IPv6 supports for private networks was added in Vagrant 1.7.5 and may
+not work with every provider.
+
 ## Disable Auto-Configuration
 
 If you want to manually configure the network interface yourself, you