diff --git a/lib/vagrant/machine.rb b/lib/vagrant/machine.rb
index 450e21fc1..c4fc253d1 100644
--- a/lib/vagrant/machine.rb
+++ b/lib/vagrant/machine.rb
@@ -452,9 +452,11 @@ module Vagrant
       info[:keys_only] ||= @config.ssh.default.keys_only
       info[:verify_host_key] ||= @config.ssh.default.verify_host_key
       info[:username] ||= @config.ssh.default.username
+      info[:remote_user] ||= @config.ssh.default.remote_user
       info[:compression] ||= @config.ssh.default.compression
       info[:dsa_authentication] ||= @config.ssh.default.dsa_authentication
       info[:extra_args] ||= @config.ssh.default.extra_args
+      info[:config] ||= @config.ssh.default.config
 
       # We set overrides if they are set. These take precedence over
       # provider-returned data.
@@ -466,7 +468,9 @@ module Vagrant
       info[:dsa_authentication] = @config.ssh.dsa_authentication
       info[:username] = @config.ssh.username if @config.ssh.username
       info[:password] = @config.ssh.password if @config.ssh.password
+      info[:remote_user] = @config.ssh.remote_user if @config.ssh.remote_user
       info[:extra_args] = @config.ssh.extra_args if @config.ssh.extra_args
+      info[:config] = @config.ssh.config if @config.ssh.config
 
       # We also set some fields that are purely controlled by Vagrant
       info[:forward_agent] = @config.ssh.forward_agent
diff --git a/lib/vagrant/util/ssh.rb b/lib/vagrant/util/ssh.rb
index 43d1dcfbf..e2b0ffaba 100644
--- a/lib/vagrant/util/ssh.rb
+++ b/lib/vagrant/util/ssh.rb
@@ -178,6 +178,10 @@ module Vagrant
             "-o", "ForwardX11Trusted=yes"]
         end
 
+        if ssh_info[:config]
+          command_options += ["-F", ssh_info[:config]]
+        end
+
         if ssh_info[:proxy_command]
           command_options += ["-o", "ProxyCommand=#{ssh_info[:proxy_command]}"]
         end
diff --git a/plugins/commands/ssh_config/command.rb b/plugins/commands/ssh_config/command.rb
index 492352f36..8b0d2830a 100644
--- a/plugins/commands/ssh_config/command.rb
+++ b/plugins/commands/ssh_config/command.rb
@@ -55,6 +55,7 @@ module VagrantPlugins
             proxy_command: ssh_info[:proxy_command],
             ssh_command:   ssh_info[:ssh_command],
             forward_env:   ssh_info[:forward_env],
+            config:        ssh_info[:config],
           }
 
           # Render the template and output directly to STDOUT
diff --git a/plugins/communicators/ssh/communicator.rb b/plugins/communicators/ssh/communicator.rb
index e9b0cce8f..c92e39980 100644
--- a/plugins/communicators/ssh/communicator.rb
+++ b/plugins/communicators/ssh/communicator.rb
@@ -414,6 +414,14 @@ module VagrantPlugins
                   connect_opts[:proxy] = Net::SSH::Proxy::Command.new(ssh_info[:proxy_command])
                 end
 
+                if ssh_info[:config]
+                  connect_opts[:config] = ssh_info[:config]
+                end
+
+                if ssh_info[:remote_user]
+                  connect_opts[:remote_user] = ssh_info[:remote_user]
+                end
+
                 @logger.info("Attempting to connect to SSH...")
                 @logger.info("  - Host: #{ssh_info[:host]}")
                 @logger.info("  - Port: #{ssh_info[:port]}")
diff --git a/plugins/kernel_v2/config/ssh_connect.rb b/plugins/kernel_v2/config/ssh_connect.rb
index c4c6fec0e..897046bad 100644
--- a/plugins/kernel_v2/config/ssh_connect.rb
+++ b/plugins/kernel_v2/config/ssh_connect.rb
@@ -3,6 +3,7 @@ module VagrantPlugins
     class SSHConnectConfig < Vagrant.plugin("2", :config)
       attr_accessor :host
       attr_accessor :port
+      attr_accessor :config
       attr_accessor :private_key_path
       attr_accessor :username
       attr_accessor :password
@@ -13,10 +14,12 @@ module VagrantPlugins
       attr_accessor :compression
       attr_accessor :dsa_authentication
       attr_accessor :extra_args
+      attr_accessor :remote_user
 
       def initialize
         @host             = UNSET_VALUE
         @port             = UNSET_VALUE
+        @config           = UNSET_VALUE
         @private_key_path = UNSET_VALUE
         @username         = UNSET_VALUE
         @password         = UNSET_VALUE
@@ -27,6 +30,7 @@ module VagrantPlugins
         @compression      = UNSET_VALUE
         @dsa_authentication = UNSET_VALUE
         @extra_args       = UNSET_VALUE
+        @remote_user      = UNSET_VALUE
       end
 
       def finalize!
@@ -42,11 +46,20 @@ module VagrantPlugins
         @compression      = true if @compression == UNSET_VALUE
         @dsa_authentication = true if @dsa_authentication == UNSET_VALUE
         @extra_args       = nil if @extra_args == UNSET_VALUE
+        @config           = nil if @config == UNSET_VALUE
 
         if @private_key_path && !@private_key_path.is_a?(Array)
           @private_key_path = [@private_key_path]
         end
 
+        if @remote_user == UNSET_VALUE
+          if @username
+            @remote_user = @username
+          else
+            @remote_user = nil
+          end
+        end
+
         if @paranoid
           @verify_host_key = @paranoid
         end
@@ -84,6 +97,15 @@ module VagrantPlugins
           end
         end
 
+        if @config
+          config_path = File.expand_path(@config, machine.env.root_path)
+          if !File.file?(config_path)
+            errors << I18n.t(
+              "vagrant.config.ssh.ssh_config_missing",
+              path: @config)
+          end
+        end
+
         if @paranoid
           machine.env.ui.warn(I18n.t("vagrant.config.ssh.paranoid_deprecated"))
         end
diff --git a/plugins/synced_folders/rsync/helper.rb b/plugins/synced_folders/rsync/helper.rb
index c190cf3c1..5604b83cf 100644
--- a/plugins/synced_folders/rsync/helper.rb
+++ b/plugins/synced_folders/rsync/helper.rb
@@ -77,6 +77,11 @@ module VagrantPlugins
           proxy_command = "-o ProxyCommand='#{ssh_info[:proxy_command]}' "
         end
 
+        ssh_config_file = ""
+        if ssh_info[:config]
+          ssh_config_file = "-F #{ssh_info[:config]}"
+        end
+
         # Create the path for the control sockets. We used to do this
         # in the machine data dir but this can result in paths that are
         # too long for unix domain sockets.
@@ -91,6 +96,7 @@ module VagrantPlugins
           "ssh", "-p", "#{ssh_info[:port]}",
           "-o", "LogLevel=#{log_level}",
           proxy_command,
+          ssh_config_file,
           control_options,
         ]
 
diff --git a/templates/commands/ssh_config/config.erb b/templates/commands/ssh_config/config.erb
index 8aa244cf0..b0cdbeedc 100644
--- a/templates/commands/ssh_config/config.erb
+++ b/templates/commands/ssh_config/config.erb
@@ -1,4 +1,7 @@
 Host <%= host_key %>
+<% if config -%>
+  Include <%= config %>
+<% end -%>
   HostName <%= ssh_host %>
   User <%= ssh_user %>
   Port <%= ssh_port %>
diff --git a/templates/locales/en.yml b/templates/locales/en.yml
index 3890182b6..5af7bdb11 100644
--- a/templates/locales/en.yml
+++ b/templates/locales/en.yml
@@ -1810,6 +1810,7 @@ en:
         paranoid_deprecated: |-
           The key `paranoid` is deprecated. Please use `verify_host_key`. Supported
           values are exactly the same, only the name of the option has changed.
+        ssh_config_missing: "`config` file must exist: %{path}"
       triggers:
         bad_command_warning: |-
           The command '%{cmd}' was not found for this trigger.
diff --git a/test/unit/plugins/commands/ssh_config/command_test.rb b/test/unit/plugins/commands/ssh_config/command_test.rb
index d88a39b66..84f593e54 100644
--- a/test/unit/plugins/commands/ssh_config/command_test.rb
+++ b/test/unit/plugins/commands/ssh_config/command_test.rb
@@ -165,5 +165,18 @@ Host #{machine.name}
       expect(output).to include('StrictHostKeyChecking ')
       expect(output).to include('UserKnownHostsFile ')
     end
+
+    it "includes custom ssh_config path when provided" do
+      allow(machine).to receive(:ssh_info) { ssh_info.merge(config: "/custom/ssh/config") }
+
+      output = ""
+      allow(subject).to receive(:safe_puts) do |data|
+        output += data if data
+      end
+
+      subject.execute
+
+      expect(output).to include("Include /custom/ssh/config")
+    end
   end
 end
diff --git a/test/unit/plugins/communicators/ssh/communicator_test.rb b/test/unit/plugins/communicators/ssh/communicator_test.rb
index 3b2cb9a32..6a979ecc3 100644
--- a/test/unit/plugins/communicators/ssh/communicator_test.rb
+++ b/test/unit/plugins/communicators/ssh/communicator_test.rb
@@ -748,6 +748,48 @@ describe VagrantPlugins::CommunicatorSSH::Communicator do
         communicator.send(:connect)
       end
     end
+
+    context "with config configured" do
+      before do
+        expect(machine).to receive(:ssh_info).and_return(
+          host: '127.0.0.1',
+          port: 2222,
+          config: './ssh_config',
+          keys_only: true,
+          verify_host_key: false
+        )
+      end
+
+      it "has config defined" do
+        expect(Net::SSH).to receive(:start).with(
+          anything, anything, hash_including(
+            config: './ssh_config'
+          )
+        ).and_return(true)
+        communicator.send(:connect)
+      end
+    end
+
+    context "with remote_user configured" do
+      let(:remote_user) { double("remote_user") }
+
+      before do
+        expect(machine).to receive(:ssh_info).and_return(
+          host: '127.0.0.1',
+          port: 2222,
+          remote_user: remote_user
+        )
+      end
+
+      it "has remote_user defined" do
+        expect(Net::SSH).to receive(:start).with(
+          anything, anything, hash_including(
+            remote_user: remote_user
+          )
+        ).and_return(true)
+        communicator.send(:connect)
+      end
+    end
   end
 
   describe ".generate_environment_export" do
diff --git a/test/unit/plugins/kernel_v2/config/ssh_connect_test.rb b/test/unit/plugins/kernel_v2/config/ssh_connect_test.rb
index 0c2772b66..e11386f31 100644
--- a/test/unit/plugins/kernel_v2/config/ssh_connect_test.rb
+++ b/test/unit/plugins/kernel_v2/config/ssh_connect_test.rb
@@ -3,6 +3,17 @@ require File.expand_path("../../../../base", __FILE__)
 require Vagrant.source_root.join("plugins/kernel_v2/config/ssh_connect")
 
 describe VagrantPlugins::Kernel_V2::SSHConnectConfig do
+  include_context "unit"
+
+  let(:iso_env) do
+    # We have to create a Vagrantfile so there is a root path
+    env = isolated_environment
+    env.vagrantfile("")
+    env.create_vagrant_env
+  end
+
+  let(:machine) { iso_env.machine(iso_env.machine_names[0], :dummy) }
+
   subject { described_class.new }
 
   describe "#verify_host_key" do
@@ -29,4 +40,67 @@ describe VagrantPlugins::Kernel_V2::SSHConnectConfig do
       expect(subject.verify_host_key).to eq(:always)
     end
   end
+
+  describe "#config" do
+    let(:config_file) { "/path/to/config" }
+
+    before do
+      # NOTE: The machine instance must be initialized before
+      #       any mocks on File are registered. Otherwise it
+      #       will cause a failure attempting to create the
+      #       instance
+      machine
+      allow(File).to receive(:file?).
+        with(/#{Regexp.escape(config_file)}/).
+        and_return(true)
+    end
+
+    it "defaults to nil" do
+      subject.finalize!
+      expect(subject.config).to be_nil
+    end
+
+    it "should return the set path" do
+      subject.config = config_file
+      subject.finalize!
+      expect(subject.config).to eq(config_file)
+    end
+
+    it "should validate when path exists" do
+      subject.config = config_file
+      subject.finalize!
+      machine
+      expect(File).to receive(:file?).
+        with(/#{Regexp.escape(config_file)}/).
+        and_return(true)
+      expect(subject.validate(machine)).to be_empty
+    end
+
+    it "should not validate when path does not exist" do
+      subject.config = config_file
+      subject.finalize!
+      expect(File).to receive(:file?).
+        with(/#{Regexp.escape(config_file)}/).
+        and_return(false)
+      expect(subject.validate(machine)).not_to be_empty
+    end
+  end
+
+  describe "#remote_user" do
+    let(:username) { double("username") }
+    let(:remote_user) { double("remote_user") }
+
+    it "should default to username value" do
+      subject.username = username
+      subject.finalize!
+      expect(subject.remote_user).to eq(subject.username)
+    end
+
+    it "should be set to provided value" do
+      subject.username = username
+      subject.remote_user = remote_user
+      subject.finalize!
+      expect(subject.remote_user).to eq(remote_user)
+    end
+  end
 end
diff --git a/test/unit/plugins/kernel_v2/config/ssh_test.rb b/test/unit/plugins/kernel_v2/config/ssh_test.rb
index 15e23a7a0..d654da450 100644
--- a/test/unit/plugins/kernel_v2/config/ssh_test.rb
+++ b/test/unit/plugins/kernel_v2/config/ssh_test.rb
@@ -8,6 +8,7 @@ describe VagrantPlugins::Kernel_V2::SSHConfig do
   describe "#default" do
     it "defaults to vagrant username" do
       subject.finalize!
+      expect(subject.default.port).to eq(22)
       expect(subject.default.username).to eq("vagrant")
     end
   end
diff --git a/test/unit/plugins/synced_folders/rsync/helper_test.rb b/test/unit/plugins/synced_folders/rsync/helper_test.rb
index 3e6c1274a..61f83eed0 100644
--- a/test/unit/plugins/synced_folders/rsync/helper_test.rb
+++ b/test/unit/plugins/synced_folders/rsync/helper_test.rb
@@ -319,5 +319,15 @@ describe VagrantPlugins::SyncedFolderRSync::RsyncHelper do
 
       subject.rsync_single(machine, ssh_info, opts)
     end
+
+    it "includes custom ssh config when set" do
+      ssh_info[:config] = "/path/to/ssh/config"
+      expect(Vagrant::Util::Subprocess).to receive(:execute) do |*args|
+        ssh_config_args = "-F /path/to/ssh/config"
+        expect(args.any?{|a| a.include?(ssh_config_args)}).to be_truthy
+        result
+      end
+      subject.rsync_single(machine, ssh_info, opts)
+    end
   end
 end
diff --git a/test/unit/vagrant/machine_test.rb b/test/unit/vagrant/machine_test.rb
index 02646e353..e956636b6 100644
--- a/test/unit/vagrant/machine_test.rb
+++ b/test/unit/vagrant/machine_test.rb
@@ -847,6 +847,16 @@ describe Vagrant::Machine do
         expect(instance.ssh_info[:private_key_path]).to eql([path])
       end
 
+      it "should return the remote_user when set" do
+        instance.config.ssh.remote_user = "remote-user"
+        expect(instance.ssh_info[:remote_user]).to eq("remote-user")
+      end
+
+      it "should return the config when set" do
+        instance.config.ssh.config = "/path/to/ssh_config"
+        expect(instance.ssh_info[:config]).to eq("/path/to/ssh_config")
+      end
+
       context "with no data dir" do
         let(:base)     { true }
         let(:data_dir) { nil }
diff --git a/test/unit/vagrant/util/ssh_test.rb b/test/unit/vagrant/util/ssh_test.rb
index a8617c6bc..9d84f0225 100644
--- a/test/unit/vagrant/util/ssh_test.rb
+++ b/test/unit/vagrant/util/ssh_test.rb
@@ -236,6 +236,26 @@ describe Vagrant::Util::SSH do
       end
     end
 
+    context "when config is provided" do
+      let(:ssh_info) {{
+        host: "localhost",
+        port: 2222,
+        username: "vagrant",
+        config: "/path/to/config"
+      }}
+
+      it "enables ssh config loading" do
+        allow(Vagrant::Util::SafeExec).to receive(:exec).and_return(nil)
+        expect(Vagrant::Util::SafeExec).to receive(:exec) do |exe_path, *args|
+          expect(exe_path).to eq(ssh_path)
+          config_options = ["-F", "/path/to/config"]
+          expect(args & config_options).to eq(config_options)
+        end
+
+        expect(described_class.exec(ssh_info)).to eq(nil)
+      end
+    end
+
     context "with subprocess enabled" do
       let(:ssh_info) {{
         host: "localhost",
diff --git a/website/source/docs/vagrantfile/ssh_settings.html.md b/website/source/docs/vagrantfile/ssh_settings.html.md
index 12227d7bd..1e457f3b4 100644
--- a/website/source/docs/vagrantfile/ssh_settings.html.md
+++ b/website/source/docs/vagrantfile/ssh_settings.html.md
@@ -18,54 +18,38 @@ defaults are typically fine, but you can fine tune whatever you would like.
 
 ## Available Settings
 
-* `config.ssh.username` (string) - This sets the username that Vagrant will SSH
-as by default. Providers are free to override this if they detect a more
-appropriate user. By default this is "vagrant", since that is what most
-public boxes are made as.
+* `config.ssh.compression` (boolean) - If `false`, this setting will not include the
+compression setting when ssh'ing into a machine. If this is not set, it will
+default to `true` and `Compression=yes` will be enabled with ssh.
 
-* `config.ssh.password` (string) - This sets a password that Vagrant will use to
-authenticate the SSH user. Note that Vagrant recommends you use key-based
-authentication rather than a password (see `private_key_path`) below. If
-you use a password, Vagrant will automatically insert a keypair if
-`insert_key` is true.
+* `config.ssh.config` (string) - Path to a custom ssh_config file to use for configuring
+the SSH connections.
 
-* `config.ssh.host` (string) - The hostname or IP to SSH into. By default this is
-empty, because the provider usually figures this out for you.
+* `config.ssh.dsa_authentication` (boolean) - If `false`, this setting  will not include
+`DSAAuthentication` when ssh'ing into a machine. If this is not set, it will
+default to `true` and `DSAAuthentication=yes` will be used with ssh.
 
-* `config.ssh.port` (integer) - The port to SSH into. By default this is port 22.
+* `config.ssh.export_command_template` (string) - The template used to generate
+exported environment variables in the active session. This can be useful
+when using a Bourne incompatible shell like C shell. The template supports
+two variables which are replaced with the desired environment variable key and
+environment variable value: `%ENV_KEY%` and `%ENV_VALUE%`. The default template
+is:
 
-* `config.ssh.guest_port` (integer) - The port on the guest that SSH is running on. This
-is used by some providers to detect forwarded ports for SSH. For example, if
-this is set to 22 (the default), and Vagrant detects a forwarded port to
-port 22 on the guest from port 4567 on the host, Vagrant will attempt
-to use port 4567 to talk to the guest if there is no other option.
+    ```ruby
+    config.ssh.export_command_template = 'export %ENV_KEY%="%ENV_VALUE%"'
+    ```
 
-* `config.ssh.private_key_path` (string, array of strings) - The path to the private
-key to use to SSH into the guest machine. By default this is the insecure private key
-that ships with Vagrant, since that is what public boxes use. If you make
-your own custom box with a custom SSH key, this should point to that
-private key. You can also specify multiple private keys by setting this to be an array.
-This is useful, for example, if you use the default private key to bootstrap
-the machine, but replace it with perhaps a more secure key later.
-
-* `config.ssh.keys_only` (boolean) - Only use Vagrant-provided SSH private keys (do not use
-any keys stored in ssh-agent). The default value is `true`.
-
-* `config.ssh.verify_host_key` (string, symbol) - Perform strict host-key verification. The
-default value is `:never`.
-
-* `config.ssh.paranoid` (boolean) - Perform strict host-key verification. The default value is
-`false`.
-
-    __Deprecation:__ The `config.ssh.paranoid` option is deprecated and will be removed
-    in a future release. Please use the `config.ssh.verify_host_key` option instead.
+* `config.ssh.extra_args` (array of strings) - This settings value is passed directly
+into the ssh executable. This allows you to pass any arbitrary commands to do things such
+as reverse tunneling down into the ssh program. These options can either be
+single flags set as strings such as `"-6"` for IPV6 or an array of arguments
+such as `["-L", "8008:localhost:80"]` for enabling a tunnel from host port 8008
+to port 80 on guest.
 
 * `config.ssh.forward_agent` (boolean) - If `true`, agent forwarding over SSH
 connections is enabled. Defaults to false.
 
-* `config.ssh.forward_x11` (boolean) - If `true`, X11 forwarding over SSH connections
-is enabled. Defaults to false.
-
 * `config.ssh.forward_env` (array of strings) - An array of host environment variables to
 forward to the guest. If you are familiar with OpenSSH, this corresponds to the `SendEnv`
 parameter.
@@ -74,6 +58,18 @@ parameter.
     config.ssh.forward_env = ["CUSTOM_VAR"]
     ```
 
+* `config.ssh.forward_x11` (boolean) - If `true`, X11 forwarding over SSH connections
+is enabled. Defaults to false.
+
+* `config.ssh.guest_port` (integer) - The port on the guest that SSH is running on. This
+is used by some providers to detect forwarded ports for SSH. For example, if
+this is set to 22 (the default), and Vagrant detects a forwarded port to
+port 22 on the guest from port 4567 on the host, Vagrant will attempt
+to use port 4567 to talk to the guest if there is no other option.
+
+* `config.ssh.host` (string) - The hostname or IP to SSH into. By default this is
+empty, because the provider usually figures this out for you.
+
 * `config.ssh.insert_key` (boolean) - If `true`, Vagrant will automatically insert
 a keypair to use for SSH, replacing Vagrant's default insecure key inside the machine
 if detected. By default, this is true.
@@ -83,6 +79,34 @@ if detected. By default, this is true.
     If you do not have to care about security in your project and want to
     keep using the default insecure key, set this to `false`.
 
+* `config.ssh.keep_alive` (boolean) - If `true`, this setting SSH will send keep-alive packets
+every 5 seconds by default to keep connections alive.
+
+* `config.ssh.keys_only` (boolean) - Only use Vagrant-provided SSH private keys (do not use
+any keys stored in ssh-agent). The default value is `true`.
+
+* `config.ssh.paranoid` (boolean) - Perform strict host-key verification. The default value is
+`false`.
+
+    __Deprecation:__ The `config.ssh.paranoid` option is deprecated and will be removed
+    in a future release. Please use the `config.ssh.verify_host_key` option instead.
+
+* `config.ssh.password` (string) - This sets a password that Vagrant will use to
+authenticate the SSH user. Note that Vagrant recommends you use key-based
+authentication rather than a password (see `private_key_path`) below. If
+you use a password, Vagrant will automatically insert a keypair if
+`insert_key` is true.
+
+* `config.ssh.port` (integer) - The port to SSH into. By default this is port 22.
+
+* `config.ssh.private_key_path` (string, array of strings) - The path to the private
+key to use to SSH into the guest machine. By default this is the insecure private key
+that ships with Vagrant, since that is what public boxes use. If you make
+your own custom box with a custom SSH key, this should point to that
+private key. You can also specify multiple private keys by setting this to be an array.
+This is useful, for example, if you use the default private key to bootstrap
+the machine, but replace it with perhaps a more secure key later.
+
 * `config.ssh.proxy_command` (string) - A command-line command to execute that receives
 the data to send to SSH on stdin. This can be used to proxy the SSH connection.
 `%h` in the command is replaced with the host and `%p` is replaced with
@@ -99,40 +123,24 @@ the port.
     streamed to the UI. Instead, the output will be delivered in full to the UI
     once the command has completed.
 
-* `config.ssh.keep_alive` (boolean) - If `true`, this setting SSH will send keep-alive packets
-every 5 seconds by default to keep connections alive.
+* `config.ssh.remote_user` (string) - The "remote user" value used to replace the `%r`
+character(s) used within a configured `ProxyCommand`. This value is only used by the
+net-ssh library (ignored by the `ssh` executable) and should not be used in general.
+This defaults to the value of `config.ssh.username`.
 
 * `config.ssh.shell` (string) - The shell to use when executing SSH commands from
 Vagrant. By default this is `bash -l`. Note that this has no effect on
 the shell you get when you run `vagrant ssh`. This configuration option
 only affects the shell to use when executing commands internally in Vagrant.
 
-* `config.ssh.export_command_template` (string) - The template used to generate
-exported environment variables in the active session. This can be useful
-when using a Bourne incompatible shell like C shell. The template supports
-two variables which are replaced with the desired environment variable key and
-environment variable value: `%ENV_KEY%` and `%ENV_VALUE%`. The default template
-is:
-
-    ```ruby
-    config.ssh.export_command_template = 'export %ENV_KEY%="%ENV_VALUE%"'
-    ```
-
 * `config.ssh.sudo_command` (string) - The command to use when executing a command
 with `sudo`. This defaults to `sudo -E -H %c`. The `%c` will be replaced by
 the command that is being executed.
 
-* `config.ssh.compression` (boolean) - If `false`, this setting will not include the
-compression setting when ssh'ing into a machine. If this is not set, it will
-default to `true` and `Compression=yes` will be enabled with ssh.
+* `config.ssh.username` (string) - This sets the username that Vagrant will SSH
+as by default. Providers are free to override this if they detect a more
+appropriate user. By default this is "vagrant", since that is what most
+public boxes are made as.
 
-* `config.ssh.dsa_authentication` (boolean) - If `false`, this setting  will not include
-`DSAAuthentication` when ssh'ing into a machine. If this is not set, it will
-default to `true` and `DSAAuthentication=yes` will be used with ssh.
-
-* `config.ssh.extra_args` (array of strings) - This settings value is passed directly
-into the ssh executable. This allows you to pass any arbitrary commands to do things such
-as reverse tunneling down into the ssh program. These options can either be
-single flags set as strings such as `"-6"` for IPV6 or an array of arguments
-such as `["-L", "8008:localhost:80"]` for enabling a tunnel from host port 8008
-to port 80 on guest.
+* `config.ssh.verify_host_key` (string, symbol) - Perform strict host-key verification. The
+default value is `:never`.