VPN: split different providers into individual files

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diff --git a/docs/vpn/dmvpn.rst b/docs/vpn/dmvpn.rst
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+.. _vpn-dmvpn:
+
+DMVPN
+-----
+
+**D** ynamic **M** ultipoint **V** irtual **P** rivate **N** etworking
+
+DMVPN is a dynamic VPN technology originally developed by Cisco. While their
+implementation was somewhat proprietary, the underlying technologies are
+actually standards based. The three technologies are:
+
+* **NHRP** - NBMA Next Hop Resolution Protocol RFC2332_
+* **mGRE** - Multipoint Generic Routing Encapsulation / mGRE RFC1702_
+* **IPSec** - IP Security (too many RFCs to list, but start with RFC4301_)
+
+NHRP provides the dynamic tunnel endpoint discovery mechanism (endpoint
+registration, and endpoint discovery/lookup), mGRE provides the tunnel
+encapsulation itself, and the IPSec protocols handle the key exchange, and
+crypto mechanism.
+
+In short, DMVPN provides the capability for creating a dynamic-mesh VPN
+network without having to pre-configure (static) all possible tunnel end-point
+peers.
+
+.. note:: DMVPN only automates the tunnel endpoint discovery and setup. A
+   complete solution also incorporates the use of a routing protocol. BGP is
+   particularly well suited for use with DMVPN.
+
+Baseline Configuration:
+
+**STEPS:**
+
+#. Create tunnel config (`interfaces tunnel`)
+#. Create nhrp (`protocols nhrp`)
+#. Create ipsec vpn (optional, but recommended for security) (`vpn ipsec`)
+
+The tunnel will be set to mGRE if for encapsulation `gre` is set, and no
+`remote-ip` is set. If the public ip is provided by DHCP the tunnel `local-ip`
+can be set to "0.0.0.0"
+
+.. figure:: ../_static/images/vpn_dmvpn_topology01.png
+   :scale: 40 %
+   :alt: Baseline DMVPN topology
+
+   Baseline DMVPN topology
+
+HUB Configuration
+^^^^^^^^^^^^^^^^^
+
+.. code-block:: sh
+
+  interfaces
+      tunnel <tunN> {
+          address <ipv4>
+          encapsulation gre
+          local-ip <public ip>
+          multicast enable
+          description <txt>
+          parameters {
+              ip {
+                  <usual IP options>
+              }
+          }
+      }
+  }
+  protocols {
+      nhrp {
+          tunnel <tunN> {
+              cisco-authentication <key phrase>
+              holding-time <seconds>
+              multicast dynamic
+              redirect
+          }
+      }
+  }
+  vpn {
+      ipsec {
+          esp-group <text> {
+              lifetime <30-86400>
+              mode tunnel
+              pfs enable
+              proposal <1-65535> {
+                  encryption aes256
+                  hash sha1
+              }
+              proposal <1-65535> {
+                  encryption 3des
+                  hash md5
+              }
+          }
+          ike-group <text> {
+              key-exchange ikev1
+              lifetime <30-86400>
+              proposal <1-65535> {
+                  encryption aes256
+                  hash sha1
+              }
+              proposal <1-65535> {
+                  encryption aes128
+                  hash sha1
+              }
+          }
+          ipsec-interfaces {
+              interface <ethN>
+          }
+          profile <text> {
+              authentication {
+                  mode pre-shared-secret
+                  pre-shared-secret <key phrase>
+              }
+              bind {
+                  tunnel <tunN>
+              }
+              esp-group <text>
+              ike-group <text>
+          }
+      }
+  }
+
+HUB Example Configuration:
+
+.. code-block:: sh
+
+  set interfaces ethernet eth0 address '1.1.1.1/30'
+  set interfaces ethernet eth1 address '192.168.1.1/24'
+  set system host-name 'HUB'
+
+  set interfaces tunnel tun0 address 10.0.0.1/24
+  set interfaces tunnel tun0 encapsulation gre
+  set interfaces tunnel tun0 local-ip 1.1.1.1
+  set interfaces tunnel tun0 multicast enable
+  set interfaces tunnel tun0 parameters ip key 1
+
+  set protocols nhrp tunnel tun0 cisco-authentication SECRET
+  set protocols nhrp tunnel tun0 holding-time  300
+  set protocols nhrp tunnel tun0 multicast dynamic
+  set protocols nhrp tunnel tun0 redirect
+
+  set vpn ipsec ipsec-interfaces interface eth0
+  set vpn ipsec ike-group IKE-HUB proposal 1
+  set vpn ipsec ike-group IKE-HUB proposal 1 encryption aes256
+  set vpn ipsec ike-group IKE-HUB proposal 1 hash sha1
+  set vpn ipsec ike-group IKE-HUB proposal 2 encryption aes128
+  set vpn ipsec ike-group IKE-HUB proposal 2 hash sha1
+  set vpn ipsec ike-group IKE-HUB lifetime 3600
+  set vpn ipsec esp-group ESP-HUB proposal 1 encryption aes256
+  set vpn ipsec esp-group ESP-HUB proposal 1 hash sha1
+  set vpn ipsec esp-group ESP-HUB proposal 2 encryption 3des
+  set vpn ipsec esp-group ESP-HUB proposal 2 hash md5
+  set vpn ipsec esp-group ESP-HUB lifetime 1800
+  set vpn ipsec esp-group ESP-HUB pfs dh-group2
+
+  set vpn ipsec profile NHRPVPN
+  set vpn ipsec profile NHRPVPN authentication mode pre-shared-secret
+  set vpn ipsec profile NHRPVPN authentication pre-shared-secret SECRET
+  set vpn ipsec profile NHRPVPN bind tunnel tun0
+  set vpn ipsec profile NHRPVPN esp-group ESP-HUB
+  set vpn ipsec profile NHRPVPN ike-group IKE-HUB
+
+  set protocols static route 0.0.0.0/0 next-hop 1.1.1.2
+  set protocols static route 192.168.2.0/24 next-hop 10.0.0.2
+  set protocols static route 192.168.3.0/24 next-hop 10.0.0.3
+
+SPOKE Configuration
+^^^^^^^^^^^^^^^^^^^
+
+SPOKE1 Configuration:
+
+.. code-block:: sh
+
+  interfaces
+      tunnel <tunN> {
+          address <ipv4>
+          encapsulation gre
+          local-ip <public ip>
+          multicast enable
+          description <txt>
+          parameters {
+              ip {
+                  <usual IP options>
+              }
+          }
+      }
+  }
+  protocols {
+      nhrp {
+          tunnel <tunN> {
+              cisco-authentication <key phrase>
+              map <ipv4/net> {
+                  nbma-address <ipv4>
+                  register
+              }
+              holding-time <seconds>
+              multicast nhs
+              redirect
+              shortcut
+          }
+      }
+  }
+  vpn {
+      ipsec {
+          esp-group <text> {
+              lifetime <30-86400>
+              mode tunnel
+              pfs enable
+              proposal <1-65535> {
+                  encryption aes256
+                  hash sha1
+              }
+              proposal <1-65535> {
+                  encryption 3des
+                  hash md5
+              }
+          }
+          ike-group <text> {
+              key-exchange ikev1
+              lifetime <30-86400>
+              proposal <1-65535> {
+                  encryption aes256
+                  hash sha1
+              }
+              proposal <1-65535> {
+                  encryption aes128
+                  hash sha1
+              }
+          }
+          ipsec-interfaces {
+              interface <ethN>
+          }
+          profile <text> {
+              authentication {
+                  mode pre-shared-secret
+                  pre-shared-secret <key phrase>
+              }
+              bind {
+                  tunnel <tunN>
+              }
+              esp-group <text>
+              ike-group <text>
+          }
+      }
+  }
+
+SPOKE1 Example Configuration
+
+.. code-block:: sh
+
+  set interfaces ethernet eth0 address 'dhcp'
+  set interfaces ethernet eth1 address '192.168.2.1/24'
+  set system host-name 'SPOKE1'
+
+  set interfaces tunnel tun0 address 10.0.0.2/24
+  set interfaces tunnel tun0 encapsulation gre
+  set interfaces tunnel tun0 local-ip 0.0.0.0
+  set interfaces tunnel tun0 multicast enable
+  set interfaces tunnel tun0 parameters ip key 1
+
+  set protocols nhrp tunnel tun0 cisco-authentication 'SECRET'
+  set protocols nhrp tunnel tun0 map 10.0.0.1/24 nbma-address 1.1.1.1
+  set protocols nhrp tunnel tun0 map 10.0.0.1/24 'register'
+  set protocols nhrp tunnel tun0 multicast 'nhs'
+  set protocols nhrp tunnel tun0 'redirect'
+  set protocols nhrp tunnel tun0 'shortcut'
+
+  set vpn ipsec ipsec-interfaces interface eth0
+  set vpn ipsec ike-group IKE-SPOKE proposal 1
+  set vpn ipsec ike-group IKE-SPOKE proposal 1 encryption aes256
+  set vpn ipsec ike-group IKE-SPOKE proposal 1 hash sha1
+  set vpn ipsec ike-group IKE-SPOKE proposal 2 encryption aes128
+  set vpn ipsec ike-group IKE-SPOKE proposal 2 hash sha1
+  set vpn ipsec ike-group IKE-SPOKE lifetime 3600
+  set vpn ipsec esp-group ESP-SPOKE proposal 1 encryption aes256
+  set vpn ipsec esp-group ESP-SPOKE proposal 1 hash sha1
+  set vpn ipsec esp-group ESP-SPOKE proposal 2 encryption 3des
+  set vpn ipsec esp-group ESP-SPOKE proposal 2 hash md5
+  set vpn ipsec esp-group ESP-SPOKE lifetime 1800
+  set vpn ipsec esp-group ESP-SPOKE pfs dh-group2
+
+  set vpn ipsec profile NHRPVPN
+  set vpn ipsec profile NHRPVPN authentication mode pre-shared-secret
+  set vpn ipsec profile NHRPVPN authentication pre-shared-secret SECRET
+  set vpn ipsec profile NHRPVPN bind tunnel tun0
+  set vpn ipsec profile NHRPVPN esp-group ESP-SPOKE
+  set vpn ipsec profile NHRPVPN ike-group IKE-SPOKE
+
+  set protocols static route 192.168.1.0/24 next-hop 10.0.0.1
+  set protocols static route 192.168.3.0/24 next-hop 10.0.0.3
+
+
+SPOKE2 Configuration
+
+.. code-block:: sh
+
+  interfaces
+      tunnel <tunN> {
+          address <ipv4>
+          encapsulation gre
+          local-ip <public ip>
+          multicast enable
+          description <txt>
+          parameters {
+              ip {
+                  <usual IP options>
+              }
+          }
+      }
+  }
+  protocols {
+      nhrp {
+          tunnel <tunN> {
+              cisco-authentication <key phrase>
+              map <ipv4/net> {
+                  nbma-address <ipv4>
+                  register
+              }
+              holding-time <seconds>
+              multicast nhs
+              redirect
+              shortcut
+          }
+      }
+  }
+  vpn {
+      ipsec {
+          esp-group <text> {
+              lifetime <30-86400>
+              mode tunnel
+              pfs enable
+              proposal <1-65535> {
+                  encryption aes256
+                  hash sha1
+              }
+              proposal <1-65535> {
+                  encryption 3des
+                  hash md5
+              }
+          }
+          ike-group <text> {
+              key-exchange ikev1
+              lifetime <30-86400>
+              proposal <1-65535> {
+                  encryption aes256
+                  hash sha1
+              }
+              proposal <1-65535> {
+                  encryption aes128
+                  hash sha1
+              }
+          }
+          ipsec-interfaces {
+              interface <ethN>
+          }
+          profile <text> {
+              authentication {
+                  mode pre-shared-secret
+                  pre-shared-secret <key phrase>
+              }
+              bind {
+                  tunnel <tunN>
+              }
+              esp-group <text>
+              ike-group <text>
+          }
+      }
+  }
+
+SPOKE2 Example Configuration
+
+.. code-block:: sh
+
+  set interfaces ethernet eth0 address 'dhcp'
+  set interfaces ethernet eth1 address '192.168.3.1/24'
+  set system host-name 'SPOKE2'
+
+  set interfaces tunnel tun0 address 10.0.0.3/24
+  set interfaces tunnel tun0 encapsulation gre
+  set interfaces tunnel tun0 local-ip 0.0.0.0
+  set interfaces tunnel tun0 multicast enable
+  set interfaces tunnel tun0 parameters ip key 1
+
+  set protocols nhrp tunnel tun0 cisco-authentication SECRET
+  set protocols nhrp tunnel tun0 map 10.0.0.1/24 nbma-address 1.1.1.1
+  set protocols nhrp tunnel tun0 map 10.0.0.1/24 register
+  set protocols nhrp tunnel tun0 multicast nhs
+  set protocols nhrp tunnel tun0 redirect
+  set protocols nhrp tunnel tun0 shortcut
+
+  set vpn ipsec ipsec-interfaces interface eth0
+  set vpn ipsec ike-group IKE-SPOKE proposal 1
+  set vpn ipsec ike-group IKE-SPOKE proposal 1 encryption aes256
+  set vpn ipsec ike-group IKE-SPOKE proposal 1 hash sha1
+  set vpn ipsec ike-group IKE-SPOKE proposal 2 encryption aes128
+  set vpn ipsec ike-group IKE-SPOKE proposal 2 hash sha1
+  set vpn ipsec ike-group IKE-SPOKE lifetime 3600
+  set vpn ipsec esp-group ESP-SPOKE proposal 1 encryption aes256
+  set vpn ipsec esp-group ESP-SPOKE proposal 1 hash sha1
+  set vpn ipsec esp-group ESP-SPOKE proposal 2 encryption 3des
+  set vpn ipsec esp-group ESP-SPOKE proposal 2 hash md5
+  set vpn ipsec esp-group ESP-SPOKE lifetime 1800
+  set vpn ipsec esp-group ESP-SPOKE pfs dh-group2
+
+  set vpn ipsec profile NHRPVPN
+  set vpn ipsec profile NHRPVPN authentication mode pre-shared-secret
+  set vpn ipsec profile NHRPVPN authentication pre-shared-secret SECRET
+  set vpn ipsec profile NHRPVPN bind tunnel tun0
+  set vpn ipsec profile NHRPVPN esp-group ESP-SPOKE
+  set vpn ipsec profile NHRPVPN ike-group IKE-SPOKE
+
+  set protocols static route 192.168.1.0/24 next-hop 10.0.0.1
+  set protocols static route 192.168.2.0/24 next-hop 10.0.0.2
diff --git a/docs/vpn/index.rst b/docs/vpn/index.rst
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+.. _vpn:
+
+.. include:: references.rst
+
+VPN
+===
+
+This chapter descriptes the available VPN services provided by VyOS.
+
+.. toctree::
+   :hidden:
+
+   openvpn
+   l2tp_ipsec
+   site2site_ipsec
+   dmvpn
+   pptp
diff --git a/docs/vpn/l2tp_ipsec.rst b/docs/vpn/l2tp_ipsec.rst
new file mode 100644
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+.. _l2tp_ipsec:
+
+L2TP over IPsec
+---------------
+
+Example for configuring a simple L2TP over IPsec VPN for remote access (works
+with native Windows and Mac VPN clients):
+
+.. code-block:: sh
+
+  set vpn ipsec ipsec-interfaces interface eth0
+  set vpn ipsec nat-traversal enable
+  set vpn ipsec nat-networks allowed-network 0.0.0.0/0
+
+  set vpn l2tp remote-access outside-address 203.0.113.2
+  set vpn l2tp remote-access client-ip-pool start 192.168.255.1
+  set vpn l2tp remote-access client-ip-pool stop 192.168.255.254
+  set vpn l2tp remote-access ipsec-settings authentication mode pre-shared-secret
+  set vpn l2tp remote-access ipsec-settings authentication pre-shared-secret <secret>
+  set vpn l2tp remote-access authentication mode local
+  set vpn l2tp remote-access authentication local-users username <username> password <password>
+
+In the example above an external IP of 203.0.113.2 is assumed.
+
+If a local firewall policy is in place on your external interface you will need
+to open:
+
+* UDP port 500 (IKE)
+* IP protocol number 50 (ESP)
+* UDP port 1701 for IPsec
+
+In addition when NAT is detected by the VPN client ESP is encapsulated in UDP
+for NAT-traversal:
+
+* UDP port 4500 (NAT-T)
+
+Example:
+
+.. code-block:: sh
+
+  set firewall name OUTSIDE-LOCAL rule 40 action 'accept'
+  set firewall name OUTSIDE-LOCAL rule 40 destination port '50'
+  set firewall name OUTSIDE-LOCAL rule 40 protocol 'esp'
+  set firewall name OUTSIDE-LOCAL rule 41 action 'accept'
+  set firewall name OUTSIDE-LOCAL rule 41 destination port '500'
+  set firewall name OUTSIDE-LOCAL rule 41 protocol 'udp'
+  set firewall name OUTSIDE-LOCAL rule 42 action 'accept'
+  set firewall name OUTSIDE-LOCAL rule 42 destination port '4500'
+  set firewall name OUTSIDE-LOCAL rule 42 protocol 'udp'
+  set firewall name OUTSIDE-LOCAL rule 43 action 'accept'
+  set firewall name OUTSIDE-LOCAL rule 43 destination port '1701'
+  set firewall name OUTSIDE-LOCAL rule 43 ipsec 'match-ipsec'
+  set firewall name OUTSIDE-LOCAL rule 43 protocol 'udp'
+
+Also note that if you wish to allow the VPN to be used for external access you
+will need to add the appropriate source NAT rules to your configuration.
+
+.. code-block:: sh
+
+  set nat source rule 110 outbound-interface 'eth0'
+  set nat source rule 110 source address '192.168.255.0/24'
+  set nat source rule 110 translation address masquerade
+
+To be able to resolve when connected to the VPN, the following DNS rules are
+needed as well.
+
+.. code-block:: sh
+
+  set vpn l2tp remote-access dns-servers server-1 '8.8.8.8'
+  set vpn l2tp remote-access dns-servers server-2 '8.8.4.4'
+
+.. note:: Those are the `Google public DNS`_ servers. You can also use the
+   public available servers from Quad9_ (9.9.9.9) or Cloudflare_ (1.1.1.1).
+
+Established sessions can be viewed using the **show vpn remote-access**
+operational command.
+
+.. code-block:: sh
+
+  vyos@vyos:~$ show vpn remote-access
+  Active remote access VPN sessions:
+  User            Proto Iface     Tunnel IP       TX byte RX byte  Time
+  ----            ----- -----     ---------       ------- -------  ----
+  vyos            L2TP  l2tp0     192.168.255.1      3.2K    8.0K  00h06m13s
+
+RADIUS authentication
+^^^^^^^^^^^^^^^^^^^^^
+
+The above configuration made use of local accounts on the VyOS router for
+authenticating L2TP/IPSec clients. In bigger environments usually something
+like RADIUS_ (FreeRADIUS_ or Microsoft `Network Policy Server`_, NPS) is used.
+
+VyOS supports either `local` or `radius` user authentication:
+
+.. code-block:: sh
+
+  set vpn l2tp remote-access authentication mode <local|radius>
+
+In addition one or more RADIUS_ servers can be configured to server for user
+authentication. This is done using the `radius server` and `radius server key`
+nodes:
+
+.. code-block:: sh
+
+  set vpn l2tp remote-access authentication radius server 1.1.1.1 key 'foo'
+  set vpn l2tp remote-access authentication radius server 2.2.2.2 key 'foo'
+
+.. note:: Some RADIUS_ severs make use of an access control list who is allowed
+   to query the server. Please configure your VyOS router in the allowed client
+   list.
+
+RADIUS source address
+*********************
+
+If you are using e.g. OSPF as IGP always the nearest interface facing the RADIUS
+server is used. With VyOS 1.2 you can bind all outgoing RADIUS requests to a
+single source IP e.g. the loopback interface.
+
+.. code-block:: sh
+
+  set vpn l2tp remote-access authentication radius source-address 3.3.3.3
+
+Above command will use `3.3.3.3` as source IPv4 address for all RADIUS queries
+on this NAS.
diff --git a/docs/vpn/openvpn.rst b/docs/vpn/openvpn.rst
new file mode 100644
index 00000000..2064860d
--- /dev/null
+++ b/docs/vpn/openvpn.rst
@@ -0,0 +1,222 @@
+.. _openvpn:
+
+OpenVPN
+-------
+
+Traditionally hardware routers implement IPsec exclusively due to relative
+ease of implementing it in hardware and insufficient CPU power for doing
+encryption in software. Since VyOS is a software router, this is less of a
+concern. OpenVPN has been widely used on UNIX platform for a long time and is
+a popular option for remote access VPN, though it's also capable of
+site-to-site connections.
+
+The advantages of OpenVPN are:
+* It uses a single TCP or UDP connection and does not rely on packet source
+addresses, so it will work even through a double NAT: perfect for public
+hotspots and such
+
+* It's easy to setup and offers very flexible split tunneling
+
+* There's a variety of client GUI frontends for any platform
+
+The disadvantages are:
+* It's slower than IPsec due to higher protocol overhead and the fact it runs
+in user mode while IPsec, on Linux, is in kernel mode
+
+* None of the operating systems have client software installed by default
+
+In the VyOS CLI, a key point often overlooked is that rather than being
+configured using the `set vpn` stanza, OpenVPN is configured as a network
+interface using `set interfaces openvpn`.
+
+OpenVPN Site-To-Site
+^^^^^^^^^^^^^^^^^^^^
+
+While many are aware of OpenVPN as a Client VPN solution, it is often
+overlooked as a site-to-site VPN solution due to lack of support for this mode
+in many router platforms.
+
+Site-to-site mode supports x.509 but doesn't require it and can also work with
+static keys, which is simpler in many cases. In this example, we'll configure
+a simple site-to-site OpenVPN tunnel using a 2048-bit pre-shared key.
+
+First, one one of the systems generate the key using the operational command
+`generate openvpn key <filename>`. This will generate a key with the name
+provided in the `/config/auth/` directory. Once generated, you will need to
+copy this key to the remote router.
+
+In our example, we used the filename `openvpn-1.key` which we will reference
+in our configuration.
+
+* The public IP address of the local side of the VPN will be 198.51.100.10
+* The remote will be 203.0.113.11
+* The tunnel will use 10.255.1.1 for the local IP and 10.255.1.2 for the remote.
+* OpenVPN allows for either TCP or UDP. UDP will provide the lowest latency,
+  while TCP will work better for lossy connections; generally UDP is preferred
+  when possible.
+* The official port for OpenVPN is 1194, which we reserve for client VPN; we
+  will use 1195 for site-to-site VPN.
+* The `persistent-tunnel` directive will allow us to configure tunnel-related
+  attributes, such as firewall policy as we would on any normal network
+  interface.
+* If known, the IP of the remote router can be configured using the
+  `remote-host` directive; if unknown, it can be omitted. We will assume a
+  dynamic IP for our remote router.
+
+Local Configuration:
+
+.. code-block:: sh
+
+  set interfaces openvpn vtun1 mode site-to-site
+  set interfaces openvpn vtun1 protocol udp
+  set interfaces openvpn vtun1 persistent-tunnel
+  set interfaces openvpn vtun1 local-host '198.51.100.10'
+  set interfaces openvpn vtun1 local-port '1195'
+  set interfaces openvpn vtun1 remote-port '1195'
+  set interfaces openvpn vtun1 shared-secret-key-file '/config/auth/openvpn-1.key'
+  set interfaces openvpn vtun1 local-address '10.255.1.1'
+  set interfaces openvpn vtun1 remote-address '10.255.1.2'
+
+Remote Configuration:
+
+.. code-block:: sh
+
+  set interfaces openvpn vtun1 mode site-to-site
+  set interfaces openvpn vtun1 protocol udp
+  set interfaces openvpn vtun1 persistent-tunnel
+  set interfaces openvpn vtun1 remote-host '198.51.100.10'
+  set interfaces openvpn vtun1 local-port '1195'
+  set interfaces openvpn vtun1 remote-port '1195'
+  set interfaces openvpn vtun1 shared-secret-key-file '/config/auth/openvpn-1.key'
+  set interfaces openvpn vtun1 local-address '10.255.1.2'
+  set interfaces openvpn vtun1 remote-address '10.255.1.1'
+
+The configurations above will default to using 128-bit Blowfish in CBC mode
+for encryption and SHA-1 for HMAC authentication. These are both considered
+weak, but a number of other encryption and hashing algorithms are available:
+
+For Encryption:
+
+.. code-block:: sh
+
+  vyos@vyos# set interfaces openvpn vtun1 encryption
+  Possible completions:
+    des          DES algorithm
+    3des         DES algorithm with triple encryption
+    bf128        Blowfish algorithm with 128-bit key
+    bf256        Blowfish algorithm with 256-bit key
+    aes128       AES algorithm with 128-bit key
+    aes192       AES algorithm with 192-bit key
+    aes256       AES algorithm with 256-bit key
+
+For Hashing:
+
+.. code-block:: sh
+
+  vyos@vyos# set interfaces openvpn vtun1 hash
+  Possible completions:
+    md5          MD5 algorithm
+    sha1         SHA-1 algorithm
+    sha256       SHA-256 algorithm
+    sha512       SHA-512 algorithm
+
+If you change the default encryption and hashing algorithms, be sure that the
+local and remote ends have matching configurations, otherwise the tunnel will
+not come up.
+
+Static routes can be configured referencing the tunnel interface; for example,
+the local router will use a network of 10.0.0.0/16, while the remote has a
+network of 10.1.0.0/16:
+
+Local Configuration:
+
+.. code-block:: sh
+
+  set protocols static interface-route 10.1.0.0/16 next-hop-interface vtun1
+
+Remote Configuration:
+
+.. code-block:: sh
+
+  set protocols static interface-route 10.0.0.0/16 next-hop-interface vtun1
+
+Firewall policy can also be applied to the tunnel interface for `local`, `in`,
+and `out` directions and function identically to ethernet interfaces.
+
+If making use of multiple tunnels, OpenVPN must have a way to distinguish
+between different tunnels aside from the pre-shared-key. This is either by
+referencing IP address or port number. One option is to dedicate a public IP
+to each tunnel. Another option is to dedicate a port number to each tunnel
+(e.g. 1195,1196,1197...).
+
+OpenVPN status can be verified using the `show openvpn` operational commands.
+See the built-in help for a complete list of options.
+
+OpenVPN Server
+^^^^^^^^^^^^^^
+
+Multi-client server is the most popular OpenVPN mode on routers. It always uses
+x.509 authentication and therefore requires a PKI setup. This guide assumes you
+have already setup a PKI and have a CA certificate, a server certificate and
+key, a certificate revokation list, a Diffie-Hellman key exchange parameters
+file. You do not need client certificates and keys for the server setup.
+
+In this example we will use the most complicated case: a setup where each
+client is a router that has its own subnet (think HQ and branch offices), since
+simpler setups are subsets of it.
+
+Suppose you want to use 10.23.1.0/24 network for client tunnel endpoints and
+all client subnets belong to 10.23.0.0/20. All clients need access to the
+192.168.0.0/16 network.
+
+First we need to specify the basic settings. 1194/UDP is the default. The
+`persistent-tunnel` option is recommended, it prevents the TUN/TAP device from
+closing on connection resets or daemon reloads.
+
+.. code-block:: sh
+
+  set interfaces openvpn vtun10 mode server
+  set interfaces openvpn vtun10 local-port 1194
+  set interfaces openvpn vtun10 persistent-tunnel
+  set interfaces openvpn vtun10 protocol udp
+
+Then we need to specify the location of the cryptographic materials. Suppose
+you keep the files in `/config/auth/openvpn`
+
+.. code-block:: sh
+
+  set interfaces openvpn vtun10 tls ca-cert-file /config/auth/openvpn/ca.crt
+  set interfaces openvpn vtun10 tls cert-file /config/auth/openvpn/server.crt
+  set interfaces openvpn vtun10 tls key-file /config/auth/openvpn/server.key
+  set interfaces openvpn vtun10 tls crl-file /config/auth/openvpn/crl.pem
+  set interfaces openvpn vtun10 tls dh-file /config/auth/openvpn/dh2048.pem
+
+Now we need to specify the server network settings. In all cases we need to
+specify the subnet for client tunnel endpoints. Since we want clients to access
+a specific network behind out router, we will use a push-route option for
+installing that route on clients.
+
+.. code-block:: sh
+
+  set interfaces openvpn vtun10 server push-route 192.168.0.0/16
+  set interfaces openvpn vtun10 server subnet 10.23.1.0/24
+
+Since it's a HQ and branch offices setup, we will want all clients to have
+fixed addresses and we will route traffic to specific subnets through them. We
+need configuration for each client to achieve this.
+
+.. note:: Clients are identified by the CN field of their x.509 certificates,
+   in this example the CN is ``client0``:
+
+.. code-block:: sh
+
+  set interfaces openvpn vtun10 server client client0 ip 10.23.1.10
+  set interfaces openvpn vtun10 server client client0 subnet 10.23.2.0/25
+
+OpenVPN **will not** automatically create routes in the kernel for client
+subnets when they connect and will only use client-subnet association
+internally, so we need to create a route to the 10.23.0.0/20 network ourselves:
+
+.. code-block:: sh
+
+  set protocols static interface-route 10.23.0.0/20 next-hop-interface vtun10
diff --git a/docs/vpn/pptp.rst b/docs/vpn/pptp.rst
new file mode 100644
index 00000000..2d560919
--- /dev/null
+++ b/docs/vpn/pptp.rst
@@ -0,0 +1,47 @@
+.. _pptp:
+
+PPTP-Server
+-----------
+
+The Point-to-Point Tunneling Protocol (PPTP_) has been implemented in VyOS only for backwards compatibility.
+PPTP has many well known secrurity issues and you should use one of the many other new VPN implementations.
+
+As per default and if not otherwise defined, mschap-v2 is being used for authentication and mppe 128-bit (stateless) for encryption.
+If no gateway-address is set within the configuration, the lowest IP out of the /24 client-ip-pool is being used. For instance, in the example below it would be 192.168.0.1.
+
+server example
+^^^^^^^^^^^^^^
+
+.. code-block:: sh
+
+  set vpn pptp remote-access authentication local-users username test password 'test'
+  set vpn pptp remote-access authentication mode 'local'
+  set vpn pptp remote-access client-ip-pool start '192.168.0.10'
+  set vpn pptp remote-access client-ip-pool stop '192.168.0.15'
+  set vpn pptp remote-access gateway-address '10.100.100.1'
+  set vpn pptp remote-access outside-address '10.1.1.120'
+
+
+client example (debian 9)
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Install the client software via apt and execute pptpsetup to generate the configuration.
+
+
+.. code-block:: sh
+
+  apt-get install pptp-linux
+  pptpsetup --create TESTTUNNEL --server 10.1.1.120 --username test --password test --encrypt
+  pon TESTTUNNEL
+
+The command pon TESTUNNEL establishes the PPTP tunnel to the remote system.
+
+
+All tunnel sessions can be checked via:
+
+.. code-block:: sh
+
+  run sh pptp-server sessions
+   ifname | username | calling-sid |      ip      | type | comp | state  |  uptime
+  --------+----------+-------------+--------------+------+------+--------+----------
+   ppp0   | test     | 10.1.1.99   | 192.168.0.10 | pptp | mppe | active | 00:00:58
diff --git a/docs/vpn/references.rst b/docs/vpn/references.rst
new file mode 100644
index 00000000..49b65cb0
--- /dev/null
+++ b/docs/vpn/references.rst
@@ -0,0 +1,10 @@
+.. _`Google Public DNS`: https://developers.google.com/speed/public-dns
+.. _Quad9: https://quad9.net
+.. _CloudFlare: https://blog.cloudflare.com/announcing-1111
+.. _RADIUS: https://en.wikipedia.org/wiki/RADIUS
+.. _FreeRADIUS: https://freeradius.org
+.. _`Network Policy Server`: https://en.wikipedia.org/wiki/Network_Policy_Server
+.. _RFC2332: https://tools.ietf.org/html/rfc2332
+.. _RFC1702: https://tools.ietf.org/html/rfc1702
+.. _RFC4301: https://tools.ietf.org/html/rfc4301
+.. _PPTP: https://en.wikipedia.org/wiki/Point-to-Point_Tunneling_Protocol
diff --git a/docs/vpn/site2site_ipsec.rst b/docs/vpn/site2site_ipsec.rst
new file mode 100644
index 00000000..f420112a
--- /dev/null
+++ b/docs/vpn/site2site_ipsec.rst
@@ -0,0 +1,109 @@
+.. _size2site_ipsec:
+
+Site-to-Site IPsec
+------------------
+
+Example:
+* eth1 is WAN interface
+* left subnet: 192.168.0.0/24 #s ite1, server side (i.e. locality, actually
+there is no client or server roles)
+* left local_ip: 1.1.1.1 # server side WAN IP
+* right subnet: 10.0.0.0/24  # site2,remote office side
+* right local_ip: 2.2.2.2 # remote office side WAN IP
+
+.. code-block:: sh
+
+  # server config
+  set vpn ipsec esp-group office-srv-esp compression 'disable'
+  set vpn ipsec esp-group office-srv-esp lifetime '1800'
+  set vpn ipsec esp-group office-srv-esp mode 'tunnel'
+  set vpn ipsec esp-group office-srv-esp pfs 'enable'
+  set vpn ipsec esp-group office-srv-esp proposal 1 encryption 'aes256'
+  set vpn ipsec esp-group office-srv-esp proposal 1 hash 'sha1'
+  set vpn ipsec ike-group office-srv-ike ikev2-reauth 'no'
+  set vpn ipsec ike-group office-srv-ike key-exchange 'ikev1'
+  set vpn ipsec ike-group office-srv-ike lifetime '3600'
+  set vpn ipsec ike-group office-srv-ike proposal 1 encryption 'aes256'
+  set vpn ipsec ike-group office-srv-ike proposal 1 hash 'sha1'
+  set vpn ipsec ipsec-interfaces interface 'eth1'
+  set vpn ipsec site-to-site peer 2.2.2.2 authentication mode 'pre-shared-secret'
+  set vpn ipsec site-to-site peer 2.2.2.2 authentication pre-shared-secret 'SomePreSharedKey'
+  set vpn ipsec site-to-site peer 2.2.2.2 ike-group 'office-srv-ike'
+  set vpn ipsec site-to-site peer 2.2.2.2 local-address '1.1.1.1'
+  set vpn ipsec site-to-site peer 2.2.2.2 tunnel 0 allow-nat-networks 'disable'
+  set vpn ipsec site-to-site peer 2.2.2.2 tunnel 0 allow-public-networks 'disable'
+  set vpn ipsec site-to-site peer 2.2.2.2 tunnel 0 esp-group 'office-srv-esp'
+  set vpn ipsec site-to-site peer 2.2.2.2 tunnel 0 local prefix '192.168.0.0/24'
+  set vpn ipsec site-to-site peer 2.2.2.2 tunnel 0 remote prefix '10.0.0.0/21'
+
+  # remote office config
+  set vpn ipsec esp-group office-srv-esp compression 'disable'
+  set vpn ipsec esp-group office-srv-esp lifetime '1800'
+  set vpn ipsec esp-group office-srv-esp mode 'tunnel'
+  set vpn ipsec esp-group office-srv-esp pfs 'enable'
+  set vpn ipsec esp-group office-srv-esp proposal 1 encryption 'aes256'
+  set vpn ipsec esp-group office-srv-esp proposal 1 hash 'sha1'
+  set vpn ipsec ike-group office-srv-ike ikev2-reauth 'no'
+  set vpn ipsec ike-group office-srv-ike key-exchange 'ikev1'
+  set vpn ipsec ike-group office-srv-ike lifetime '3600'
+  set vpn ipsec ike-group office-srv-ike proposal 1 encryption 'aes256'
+  set vpn ipsec ike-group office-srv-ike proposal 1 hash 'sha1'
+  set vpn ipsec ipsec-interfaces interface 'eth1'
+  set vpn ipsec site-to-site peer 1.1.1.1 authentication mode 'pre-shared-secret'
+  set vpn ipsec site-to-site peer 1.1.1.1 authentication pre-shared-secret 'SomePreSharedKey'
+  set vpn ipsec site-to-site peer 1.1.1.1 ike-group 'office-srv-ike'
+  set vpn ipsec site-to-site peer 1.1.1.1 local-address '2.2.2.2'
+  set vpn ipsec site-to-site peer 1.1.1.1 tunnel 0 allow-nat-networks 'disable'
+  set vpn ipsec site-to-site peer 1.1.1.1 tunnel 0 allow-public-networks 'disable'
+  set vpn ipsec site-to-site peer 1.1.1.1 tunnel 0 esp-group 'office-srv-esp'
+  set vpn ipsec site-to-site peer 1.1.1.1 tunnel 0 local prefix '10.0.0.0/21'
+  set vpn ipsec site-to-site peer 1.1.1.1 tunnel 0 remote prefix '192.168.0.0/24'
+
+Show status of new setup:
+
+.. code-block:: sh
+
+  vyos@srv-gw0:~$ show vpn ike sa
+  Peer ID / IP                            Local ID / IP
+  ------------                            -------------
+  2.2.2.2                                 1.1.1.1
+     State  Encrypt  Hash    D-H Grp  NAT-T  A-Time  L-Time
+     -----  -------  ----    -------  -----  ------  ------
+     up     aes256   sha1    5        no     734     3600
+
+  vyos@srv-gw0:~$ show vpn ipsec sa
+  Peer ID / IP                            Local ID / IP
+  ------------                            -------------
+  2.2.2.2                                 1.1.1.1
+     Tunnel  State  Bytes Out/In   Encrypt  Hash    NAT-T  A-Time  L-Time  Proto
+     ------  -----  -------------  -------  ----    -----  ------  ------  -----
+     0       up     7.5M/230.6K    aes256   sha1    no     567     1800    all
+
+If there is SNAT rules on eth1, need to add exclude rule
+
+.. code-block:: sh
+
+  # server side
+  set nat source rule 10 destination address '10.0.0.0/24'
+  set nat source rule 10 'exclude'
+  set nat source rule 10 outbound-interface 'eth1'
+  set nat source rule 10 source address '192.168.0.0/24'
+
+  # remote office side
+  set nat source rule 10 destination address '192.168.0.0/24'
+  set nat source rule 10 'exclude'
+  set nat source rule 10 outbound-interface 'eth1'
+  set nat source rule 10 source address '10.0.0.0/24'
+
+To allow traffic to pass through to clients, you need to add the following
+rules. (if you used the default configuration at the top of this page)
+
+.. code-block:: sh
+
+  # server side
+  set firewall name OUTSIDE-LOCAL rule 32 action 'accept'
+  set firewall name OUTSIDE-LOCAL rule 32 source address '10.0.0.0/24'
+
+  # remote office side
+  set firewall name OUTSIDE-LOCAL rule 32 action 'accept'
+  set firewall name OUTSIDE-LOCAL rule 32 source address '192.168.0.0/24'