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Christian Poessinger 2019-08-06 09:51:09 +02:00
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docs/vpn/l2tp.rst
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@ -3,7 +3,8 @@
L2TP
-----------
VyOS utilizes accel-ppp_ to provide SSTP server functionality. It can be used with local authentication or a connected RADIUS server.
VyOS utilizes accel-ppp_ to provide SSTP server functionality. It can be used
with local authentication or a connected RADIUS server.
L2TP over IPsec
===============
@ -26,7 +27,8 @@ with native Windows and Mac VPN clients):
set vpn l2tp remote-access authentication mode local
set vpn l2tp remote-access authentication local-users username test password 'test'
In the example above an external IP of 192.0.2.2 is assumed. Nexthop IP address 192.168.255.1 uses as client tunnel termination point.
In the example above an external IP of 192.0.2.2 is assumed. Nexthop IP address
192.168.255.1 uses as client tunnel termination point.
If a local firewall policy is in place on your external interface you will need
to allow the ports below:
@ -66,7 +68,8 @@ To allow VPN-clients access via your external address, a NAT rule is required:
set nat source rule 110 translation address masquerade
VPN-clients will request configuration parameters, optionally you can DNS parameter to the client.
VPN-clients will request configuration parameters, optionally you can DNS
parameter to the client.
.. code-block:: sh
@ -82,15 +85,15 @@ operational command, or **show l2tp-server sessions**
.. code-block:: sh
vyos@vyos:~$ show vpn remote-access
ifname | username | calling-sid | ip | rate-limit | type | comp | state | uptime
ifname | username | calling-sid | ip | rate-limit | type | comp | state | uptime
--------+----------+--------------+---------------+------------+------+------+--------+----------
ppp0 | vyos | 192.168.0.36 | 192.168.255.1 | | l2tp | | active | 00:06:13
ppp0 | vyos | 192.168.0.36 | 192.168.255.1 | | l2tp | | active | 00:06:13
LNS (L2TP Network Server)
=========================
LNS are often used to connect to a LAC (L2TP Access Concentrator).
LNS are often used to connect to a LAC (L2TP Access Concentrator).
Below is an example to configure a LNS:
@ -101,13 +104,16 @@ Below is an example to configure a LNS:
set vpn l2tp remote-access client-ip-pool start 192.168.255.2
set vpn l2tp remote-access client-ip-pool stop 192.168.255.254
set vpn l2tp remote-access lns shared-secret 'secret'
set vpn l2tp remote-access ccp-disable
set vpn l2tp remote-access ccp-disable
set vpn l2tp remote-access authentication mode local
set vpn l2tp remote-access authentication local-users username test password 'test'
The example above uses 192.0.2.2 as external IP address, the nexthop is supposed to be 192.168.255.1 and is used as client termination point.
A LAC normally requires an authentication password, which is set in the example configuration to ``lns shared-secret 'secret'``.
This setup requires the Compression Control Protocol (CCP) being disabled, the command ``set vpn l2tp remote-access ccp-disable`` accomplishes that.
The example above uses 192.0.2.2 as external IP address, the nexthop is supposed
to be 192.168.255.1 and is used as client termination point. A LAC normally
requires an authentication password, which is set in the example configuration
to ``lns shared-secret 'secret'``. This setup requires the Compression Control
Protocol (CCP) being disabled, the command ``set vpn l2tp remote-access ccp-disable``
accomplishes that.
Bandwidth Shaping
@ -115,7 +121,7 @@ Bandwidth Shaping
Bandwidth rate limits can be set for local users or via RADIUS based attributes.
Bandwidth Shaping for local users
Bandwidth Shaping for local users
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The rate-limit is set in kbit/sec.
@ -131,31 +137,34 @@ The rate-limit is set in kbit/sec.
set vpn l2tp remote-access authentication local-users username test rate-limit download 20480
set vpn l2tp remote-access authentication local-users username test rate-limit upload 10240
vyos@vyos:~$ show vpn remote-access
ifname | username | calling-sid | ip | rate-limit | type | comp | state | uptime
vyos@vyos:~$ show vpn remote-access
ifname | username | calling-sid | ip | rate-limit | type | comp | state | uptime
-------+----------+--------------+---------------+-------------+------+------+--------+-----------
ppp0 | test | 192.168.0.36 | 192.168.255.2 | 20480/10240 | l2tp | | active | 00:06:30
ppp0 | test | 192.168.0.36 | 192.168.255.2 | 20480/10240 | l2tp | | active | 00:06:30
RADIUS authentication
======================
To enable RADIUS based authentication, the authentication mode needs to be changed withing the configuration.
Previous settings like the local users, still exists within the configuration, however they are not used if the mode
has been changed from local to radius. Once changed back to local, it will use all local accounts again.
To enable RADIUS based authentication, the authentication mode needs to be
changed withing the configuration. Previous settings like the local users, still
exists within the configuration, however they are not used if the mode has been
changed from local to radius. Once changed back to local, it will use all local
accounts again.
.. code-block:: sh
set vpn l2tp remote-access authentication mode <local|radius>
Since the RADIUS server would be a single point of failure, multiple RADIUS server can be setup and will be used subsequentially.
Since the RADIUS server would be a single point of failure, multiple RADIUS
servers can be setup and will be used subsequentially.
.. code-block:: sh
set vpn l2tp remote-access authentication radius server 10.0.0.1 key 'foo'
set vpn l2tp remote-access authentication radius server 10.0.0.2 key 'foo'
.. note:: Some RADIUS_ severs use an access control list which allows or denies queries,
make sure to add your VyOS router to the allowed client list.
.. note:: Some RADIUS_ severs use an access control list which allows or denies
queries, make sure to add your VyOS router to the allowed client list.
RADIUS source address
^^^^^^^^^^^^^^^^^^^^^
@ -171,8 +180,8 @@ single source IP e.g. the loopback interface.
Above command will use `10.0.0.3` as source IPv4 address for all RADIUS queries
on this NAS.
.. note::
The ``source-address`` must be configured on one of VyOS interface.
.. note:: The ``source-address`` must be configured on one of VyOS interface.
Best proctice would be a loopback or dummy interface.
RADIUS bandwidth shaping attribute
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@ -183,31 +192,40 @@ To enable bandwidth shaping via RADIUS, the option rate-limit needs to be enable
set vpn l2tp remote-access authentication radius rate-limit enable
The default RADIUS attribute for rate limiting is ``Filter-Id``, but you may also redefine it.
The default RADIUS attribute for rate limiting is ``Filter-Id``, but you may also
redefine it.
.. code-block:: sh
set vpn l2tp remote-access authentication radius rate-limit attribute Download-Speed
.. note:: If you set a custom RADIUS attribute you must define it on both dictionaries at RADIUS server and client, which is the vyos router in our example.
.. note:: If you set a custom RADIUS attribute you must define it on both
dictionaries at RADIUS server and client, which is the vyos router in our
example.
The RADIUS dictionaries in VyOS are located at ``/usr/share/accel-ppp/radius/``
RADIUS advanced features
^^^^^^^^^^^^^^^^^^^^^^^^
Received RADIUS attributes have a higher priority than parameters defined withm the cli configuration, refer to the explanation below.
Received RADIUS attributes have a higher priority than parameters defined within
the CLI configuration, refer to the explanation below.
Allocation clients ip addresses by RADIUS
*****************************************
If the RADIUS server sends the attribute ``Framed-IP-Address`` then this IP address will be allocated to the client and the option ip-pool within the cli config is being ignored.
If the RADIUS server sends the attribute ``Framed-IP-Address`` then this IP
address will be allocated to the client and the option ip-pool within the CLI
config is being ignored.
Renaming clients interfaces by RADIUS
*************************************
If the RADIUS server uses the attribute ``NAS-Port-Id``, ppp tunnels will be renamed.
If the RADIUS server uses the attribute ``NAS-Port-Id``, ppp tunnels will be
renamed.
.. note:: The value of the attribute ``NAS-Port-Id`` must be less than 16 characters, otherwise the interface won't be renamed.
.. note:: The value of the attribute ``NAS-Port-Id`` must be less than 16
characters, otherwise the interface won't be renamed.
.. _`Google Public DNS`: https://developers.google.com/speed/public-dns