VPN: split different providers into individual files

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diff --git a/docs/vpn/pptp.rst b/docs/vpn/pptp.rst
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+.. _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