X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/eb6906a28c887872d459890ad05cbf8e07c97b75..bd2ec601493cece0de9e565e7bd497b129bece10:/Docs/manual.html diff --git a/Docs/manual.html b/Docs/manual.html index 59d6dbc..4db3a83 100644 --- a/Docs/manual.html +++ b/Docs/manual.html @@ -52,7 +52,8 @@ H3 {
  • Interception
  • Authentication
  • Plugins
    • -
  • Walled Garden
    • +
  • Walled Garden
    • +
  • Filtering
  • Clustering
  • Routing
  • Performance
    • @@ -66,7 +67,7 @@ L2TP (Layer 2 Tunneling Protocol) is designed to allow any layer 2 protocol (e.g. Ethernet, PPP) to be tunneled over an IP connection. l2tpns implements PPP over L2TP only.

    -There are a couple of other L2TP imlementations, of which l2tpd is probably the most popular. l2tpd also will handle being either end of a tunnel, and is a lot more configurable than l2tpns. However, due to the way it works, @@ -190,39 +191,47 @@ user, both a primary and a secondary. If either is set to 0.0.0.0, then that one will not be sent. -

  • save_state (boolean)
    -When l2tpns receives a STGTERM it will write out its current -ip_address_pool, session and tunnel tables to disk prior to exiting to -be re-loaded at startup. The validity of this data is obviously quite -short and the intent is to allow an sessions to be retained over a -software upgrade. -
    • -
  • primary_radius (ip address)
  • secondary_radius (ip address)
    -Sets the radius servers used for both authentication and accounting. -If the primary server does not respond, then the secondary radius -server will be tried. +Sets the RADIUS servers used for both authentication and accounting. +If the primary server does not respond, then the secondary RADIUS +server will be tried.
    +Note: in addition to the source IP address and +identifier, the RADIUS server must include the source +port when detecting duplicates to supress (in order to cope with a +large number of sessions comming on-line simultaneously l2tpns uses a +set of udp sockets, each with a seperate identifier).
  • primary_radius_port (short)
  • secondary_radius_port (short)
    -Sets the authentication ports for the primary and secondary radius +Sets the authentication ports for the primary and secondary RADIUS servers. The accounting port is one more than the authentication -port. If no radius ports are given, the authentication port defaults +port. If no RADIUS ports are given, the authentication port defaults to 1645, and the accounting port to 1646.
  • radius_accounting (boolean)
    -If set to true, then radius accounting packets will be sent. This +If set to true, then RADIUS accounting packets will be sent. This means that a Start record will be sent when the session is successfully authenticated, and a Stop record will be sent when the session is closed.
  • radius_secret (string)
    -This secret will be used in all radius queries. If this is not set then -radius queries will fail. +This secret will be used in all RADIUS queries. If this is not set then +RADIUS queries will fail. +
    • + +
  • radius_authtypes (string)
    +A comma separated list of supported RADIUS authentication methods +(pap or chap), in order of preference (default pap). +
    • + +
  • allow_duplicate_users (boolean)
    +Allow multiple logins with the same username. If false (the default), +any prior session with the same username will be dropped when a new +session is established.
  • bind_address (ip address)
    @@ -276,10 +285,6 @@ second. Even if this is disabled, you can see this information by running the uptime command on the CLI.
    • -
  • cleanup_interval (int)
    -Interval between regular cleanups (in seconds). -
    • -
  • multi_read_count (int)
    Number of packets to read off each of the UDP and TUN fds when returned as readable by select (default: 10). Avoids incurring the @@ -301,6 +306,13 @@ Keep all pages mapped by the l2tpns process in memory. Maximum number of host unreachable ICMP packets to send per second.
    • +
  • packet_limit (int>
    +Maximum number of packets of downstream traffic to be handled each +tenth of a second per session. If zero, no limit is applied (default: +0). Intended as a DoS prevention mechanism and not a general +throttling control (packets are dropped, not queued). +
    • +
  • cluster_address (ip address)
    Multicast cluster address (default: 239.192.13.13). See the section on Clustering for more information. @@ -319,6 +331,11 @@ Cluster heartbeat timeout in tenths of a second. A new master will be elected when this interval has been passed without seeing a heartbeat from the master.
    • + +
  • cluster_master_min_adv (int)
    +Determines the minumum number of up to date slaves required before the +master will drop routes (default: 1). +

    • BGP routing configuration is entered by the command: @@ -338,6 +355,42 @@ Where peer specifies the BGP neighbour as either a hostname or IP address, as is the remote AS number and keepalive, hold are the timer values in seconds. +

    Named access-lists are configured using one of the commands: +

    +
    ip access-list standard name +
    ip access-list extended name +
    + +

    Subsequent lines prefixed with permit or deny +define the body of the access-list. Standard access-list syntax: +

    +
    {permit|deny} + {host|source source-wildcard|any} + [{host|destination destination-wildcard|any}] +
    + +Extended access-lists: + +
    +

    {permit|deny} ip + {host|source source-wildcard|any} + {host|destination destination-wildcard|any} [fragments] +

    {permit|deny} udp + {host|source source-wildcard|any} + [{eq|neq|gt|lt} port|range from to] + {host|destination destination-wildcard|any} + [{eq|neq|gt|lt} port|range from to] + [fragments] +

    {permit|deny} tcp + {host|source source-wildcard|any} + [{eq|neq|gt|lt} port|range from to] + {host|destination destination-wildcard|any} + [{eq|neq|gt|lt} port|range from to] + [{established|{match-any|match-all} + {+|-}{fin|syn|rst|psh|ack|urg} + ...|fragments] +

    +

    users

    Usernames and passwords for the command-line interface are stored in @@ -500,19 +553,19 @@ IP Address Used Session User
  • show radius
    -Show a summary of the in-use radius sessions. This list should not be very -long, as radius sessions should be cleaned up as soon as they are used. The +Show a summary of the in-use RADIUS sessions. This list should not be very +long, as RADIUS sessions should be cleaned up as soon as they are used. The columns listed are: - + - -
    RadiusThe ID of the radius request. This is - sent in the packet to the radius server for identification.
    RadiusThe ID of the RADIUS request. This is + sent in the packet to the RADIUS server for identification.
    StateThe state of the request - WAIT, CHAP, AUTH, IPCP, START, STOP, NULL.
    SessionThe session ID that this radius +
    SessionThe session ID that this RADIUS request is associated with
    RetryIf a response does not appear to the request, it will retry at this time. This is a unix timestamp.
    TryRetry count. The radius request is +
    TryRetry count. The RADIUS request is discarded after 3 retries.

    @@ -553,7 +606,7 @@ current session for that username will be forwarded to the given host/port. Specify no snoop username to disable interception for the session.

    -If you want interception to be permanent, you will have to modify the radius +If you want interception to be permanent, you will have to modify the RADIUS response for the user. See Interception.

    • @@ -564,7 +617,7 @@ session. Specify no throttle username to disable throttling for the current session.

    If you want throttling to be permanent, you will have to modify the -radius response for the user. See Throttling. +RADIUS response for the user. See Throttling.

    @@ -643,14 +696,10 @@ killall -HUP l2tpns The signals understood are:

    Throttling

    @@ -660,7 +709,7 @@ desire. You must first enable the global setting throttle_speed before this will be activated.

    If you wish a session to be throttled permanently, you should set the -Vendor-Specific radius value Cisco-Avpair="throttle=yes", which +Vendor-Specific RADIUS value Cisco-Avpair="throttle=yes", which will be handled by the autothrottle module.

    Otherwise, you can enable and disable throttling an active session using @@ -684,7 +733,7 @@ and no snoop username CLI commands. These will enable interception immediately.

    If you wish the user to be intercepted whenever they reconnect, you will -need to modify the radius response to include the Vendor-Specific value +need to modify the RADIUS response to include the Vendor-Specific value Cisco-Avpair="intercept=yes". For this feature to be enabled, you need to have the autosnoop module loaded.

    @@ -694,11 +743,11 @@ Whenever a session connects, it is not fully set up until authentication is completed. The remote end must send a PPP CHAP or PPP PAP authentication request to l2tpns.

    -This request is sent to the radius server, which will hopefully respond with +This request is sent to the RADIUS server, which will hopefully respond with Auth-Accept or Auth-Reject.

    If Auth-Accept is received, the session is set up and an IP address is -assigned. The radius server can include a Framed-IP-Address field in the +assigned. The RADIUS server can include a Framed-IP-Address field in the reply, and that address will be assigned to the client. It can also include specific DNS servers, and a Framed-Route if that is required.

    @@ -708,7 +757,7 @@ walled garden module is loaded, in which case the user still receives the PPP AUTHACK, but their session is flagged as being a garden'd user, and they should not receive any service.

    -The radius reply can also contain a Vendor-Specific attribute called +The RADIUS reply can also contain a Vendor-Specific attribute called Cisco-Avpair. This field is a freeform text field that most Cisco devices understand to contain configuration instructions for the session. In the case of l2tpns it is expected to be of the form @@ -758,7 +807,7 @@ supplied structure: - - -
    EventDescriptionParameters
    pre_authThis is called after a radius response has been + This is called after a RADIUS response has been received, but before it has been processed by the code. This will allow you to modify the response in some way. @@ -775,7 +824,7 @@ supplied structure:
    post_authThis is called after a radius response has been + This is called after a RADIUS response has been received, and the basic checks have been performed. This is what the garden module uses to force authentication to be accepted. @@ -855,7 +904,7 @@ supplied structure:
    radius_responseThis is called whenever a radius response includes a + This is called whenever a RADIUS response includes a Cisco-Avpair value. The value is split up into key=value pairs, and each is processed through all modules. @@ -901,7 +950,7 @@ Walled Garden is implemented so that you can provide perhaps limited service to sessions that incorrectly authenticate.

    Whenever a session provides incorrect authentication, and the -radius server responds with Auth-Reject, the walled garden module +RADIUS server responds with Auth-Reject, the walled garden module (if loaded) will force authentication to succeed, but set the flag garden in the session structure, and adds an iptables rule to the garden_users chain to force all packets for the session's IP @@ -926,6 +975,14 @@ command: iptables -t nat -L garden -nvx +

    Filtering

    + +Sessions may be filtered by specifying Filter-Id attributes in +the RADIUS reply. filter.in specifies that the named +access-list filter should be applied to traffic from the +customer, filter.out specifies a list for traffic to the +customer. +

    Clustering

    An l2tpns cluster consists of of one* or more servers configured with