l2tpconfig(1)

NAME
l2tpconfig - command-line configuration for OpenL2TP

SYNOPSIS
l2tpconfig [-q] [-R <ipaddr>] [-t] [command]

DESCRIPTION
OpenL2TP is controlled using a Remote Procedure Call (RPC) interface documented in openl2tp_rpc(4). l2tpconfig is an RPC client application implementing this interface, providing the user with an intuitive command line interface.

For information about the general features of OpenL2TP please refer to the openl2tp(7) manual page.

OPTIONS

-q  Quiet mode. Suppresses information messages, such as "Created xyz".

-t  TCP mode. Uses TCP rather than UDP (default) to communicate with openl2tpd. Use this option when the number of sessions handled by openl2tpd is large. TCP has the advantage that RPC packets may be larger than 8K, which avoids RPC errors in the l2tpconfigP "list" commands when there are so many items to list that 8K is not enough space. A disadvantage of TCP is that there is more protocol overhead with TCP. Note that this affects only the management protocol between l2tpconfig and openl2tpd, it does not change L2TP itself. This option is intended mostly for use in ISP environments.

-R ipaddr
    Send commands to openl2tpd running at ipaddr rather than to the local host. Remote management must be enabled for openl2tpd at the remote host for this option to work. ipaddr may be specified as an IP address or a hostname.

command
    the specified command is executed and then l2tpconfig terminates. When no command is given, l2tpconfig enters interactive mode, presenting the user with a Command Line Interface (CLI) providing command line editing, context sensitive help and TAB completion.

ENVIRONMENT
openl2tpd must be running before the first l2tpconfig command is issued. OpenL2TP uses Sun RPC to communicate with openl2tpd, so the system must be capable of running RPC.

COMMANDS
Commands are grouped according to the object type being managed. The general format of a command is

<object-type> <operation> [param1[=<value1>]]...

Note that the syntax for specifying all parameters is the same, whether or not the parameter is mandatory or optional. Parameters may be given in any order.

Each object type supports one or more of the following operations:

CREATE
    Creates an instance of the object type. Parameters must uniquely identify the object instance being created. Additional optional parameters may override create-time defaults.

DELETE
    Deletes an instance of the object type. Parameters must uniquely identify the object instance being deleted.

MODIFY
    Modifies an instance which already exists of the object type. Parameters must uniquely identify the object instance being modified and additional optional parameters determine the attributes and values being changed.

SHOW
    Shows detail about a single object instance. Parameters must uniquely identify the object instance.

LIST
    Lists a summary of all instances of the object. This command may need additional arguments according to context.

UNSET
    The unset operation is valid only for profiles. It allows previously set or modified profile parameters to be unset, i.e. returned to default values. This is useful because profile parameters may be inherited. Unsetting a parameter of a profile means that it will not override the value from another profile.

Only one operation is performed on an object with a single command, although in the case of CREATE and MODIFY operations, multiple parameters may be set in one command. When invoking most operations on an object, parameters must be specified to identify the object instance. (LIST is an exception because depending on context, it may not take parameters.)

OBJECT TYPES
The following object types exist in OpenL2TP:

SYSTEM
    Contains attributes that may be used to control the system behavior of OpenL2TP, i.e. tunnel instance limits, UDP port number etc. There is always one instance of this object; instances cannot be created or deleted.

TUNNEL PROFILE
    Provides a named set of L2TP tunnel parameters which may be used when creating tunnels locally (by specifying the tunnel profile name when the tunnel is created) or when tunnels are created by remote request.

SESSION PROFILE
    Provides a named set of L2TP session parameters which may be used when creating sessions locally (by specifying the tunnel profile name when the tunnel is created) or when sessions are created by remote request.

PPP PROFILE
    Provides a named set of PPP parameters which are to be used when creating PPP sessions in L2TP sessions.

PEER PROFILE
    Identifies parameters to be used when connecting to an L2TP peer. Peers are identified by name or by IP address / netmask. The peer profile specifies default tunnel, session and PPP profile names which are to be used for the peer, unless overridden by other settings.

TUNNEL
    Contains parameters of an L2TP tunnel, such as tunnel secret, AVP hiding, L2TP hello timeout etc. A tunnel is identified by a system-unique 16-bit identifier (tunnel_id) which is automatically generated. One instance of this object type exists for each L2TP tunnel.

SESSION
    Contains parameters of an L2TP session, such as whether to use data sequence numbers. A session is identified by a tunnel-unique 16-bit identifier (session_id) and the tunnel's tunnel_id. One instance of this object type exists for each L2TP session.

INTERACTIVE MODE
l2tpconfig provides a context-sensitive Command Line Interface (CLI). Hitting <TAB> at the prompt shows a list of keywords applicable. Entering a few letters of a keyword and hitting TAB again completes the keyword (if possible). Hitting TAB again shows a list of next valid keywords. When valid object type name and operation are present, <TAB> shows a list of valid parameters for the operation. Entering a few letters of a parameter and hitting <TAB> completes the parameter name if possible and appends a '=' sign after the name if the parameter takes a value.

The <?> key behaves similarly to <TAB> in that it displays possible completions but it also gives descriptive help about each option.

  KEY BINDINGS
l2tpconfig provides intuitive command line editing with history. Key bindings are the same as bash(1) by default, although they can be changed using l2tpconfig entries in a .inputrc file. See the readline(3) manual page for more information.

Commonly used default key bindings are:

<ctrl-a>
    beginning of line

<ctrl-e>
    end of line

<ctrl-k>
    kill characters from cursor to end of line

<ctrl-y>
    yank characters last killed into line at cursor position

<meta-f>
    forward a word

<meta-b>
    back a word

<meta-t>
    transpose word at cursor position with previous word.

On keyboards without a Meta (Alt) key, the Escape key can be used.

  COMMAND HISTORY
In interactive mode, l2tpconfig writes command history data to ~/.l2tp_history when the application exits. This gives the operator the ability to recall commands from a previous session.

If desired, the environment variable L2TP_HISTFILE can be used to point to an alternative history file and L2TP_HISTFILESIZE can be used to limit the history file to nnn entries. If L2TP_HISTFILE is set to an empty string, the writing of history information to a file is disabled.

PERSISTENT CONFIGURATION
OpenL2TP does not use configuration files; all configuration is done using an RPC client application such as l2tpconfig. However, it is useful to save and restore configuration snapshots. l2tpconfig provides

config save file=<filename>

and

config restore file=<filename>

commands for this purpose. Configuration data is written to the file in plain text so may be edited by hand if desired. Note that this feature is implemented in l2tpconfig, not the openl2tpd daemon. Future versions may add an RPC interface to allow RPC client applications the ability to retrieve and restore configuration in a binary format.

SYNTAX SUMMARY
The following output is taken from the context sensitive help in l2tpconfig's. interactive mode. Use the <?> key to ask for context sensitive help.

  COMMAND SUMMARY
l2tp> ?
exit    - exit application
peer    - peer commands
ppp     - ppp commands
session - session commands
tunnel  - tunnel commands
system  - system commands
debug   - debug commands
server  - server configuration
config  - configuration save/restore
quit    - exit application
l2tp> peer ?
profile - peer profile commands
l2tp> peer profile ?
create - create a new L2TP peer profile
list   - list all L2TP peer profiles
show   - show an L2TP peer profile
modify - modify an L2TP peer profile
delete - delete an L2TP peer profile
unset  - unset parameters of an L2TP peer profile
l2tp> ppp ?
profile - ppp profile commands
l2tp> ppp profile ?
create - create a new L2TP ppp profile
list   - list all L2TP ppp profiles
show   - show an L2TP ppp profile
modify - modify an L2TP ppp profile
delete - delete an L2TP ppp profile
unset  - unset parameters of an L2TP ppp profile
l2tp> tunnel ?
create  - create a new L2TP tunnel
profile - tunnel profile commands
list    - list all L2TP tunnels
show    - show an L2TP tunnel
modify  - modify an L2TP tunnel
delete  - delete an L2TP tunnel
l2tp> tunnel profile ?
create - create a new L2TP tunnel profile
list   - list all L2TP tunnel profiles
show   - show an L2TP tunnel profile
modify - modify an L2TP tunnel profile
delete - delete an L2TP tunnel profile
unset  - unset parameters of an L2TP tunnel profile
l2tp> session ?
create  - create a new L2TP session
profile - session profile commands
list    - list all L2TP sessions on a specified tunnel
show    - show an L2TP session
modify  - modify an L2TP session
delete  - delete an L2TP session
l2tp> session profile ?
create - create a new L2TP session profile
list   - list all L2TP session profiles
show   - show an L2TP session profile
modify - modify an L2TP session profile
delete - delete an L2TP session profile
unset  - unset parameters of an L2TP session profile
l2tp> system ?
modify - modify system parameters
show   - show system configuration and statistics
l2tp> debug ?
modify - modify debug settings
show   - show debug settings
l2tp> server ?
modify - modify server parameters
show   - show server parameters
l2tp> config ?
save    - save configuration
restore - restore configurationfrom file

  PEER PROFILE CREATE / MODIFY / UNSET
l2tp> peer profile create ?
profile_name         - Name of peer profile
peer_ipaddr          - IP address of peer
peer_port            - UDP port with which to connect to peer.
                       Default=1701.
netmask              - IP netmask to be used when matching for
                       peer_ipaddr. Default=255.255.255.255.
lac_lns              - We can operate as a LAC or LNS or both.
tunnel_profile_name  - Name of default Tunnel Profile.
                       Default="default"
session_profile_name - Name of default Session Profile.
                       Default="default"
ppp_profile_name     - Name of default Ppp Profile.
                       Default="default"

  PEER PROFILE LIST
l2tp> peer profile list ?

  PEER PROFILE SHOW
l2tp> peer profile show ?
profile_name - Name of peer profile

  PEER PROFILE DELETE
l2tp> peer profile delete ?
profile_name - Name of peer profile

  PPP PROFILE CREATE / MODIFY / UNSET
l2tp> ppp profile create ?
profile_name             - Name of ppp profile
trace_flags              - Trace flags, for debugging network
                           problems
asyncmap                 - Async character map. Valid only if PPP is
                           async mode.
mtu                      - Maximum Transmit Unit (MTU) or maximum
                           packet size transmitted.
mru                      - Maximum Receive Unit (MRU) or maximum packet
                           size passed when received.
sync_mode                - Allow PPP sync/async operation.
auth_pap                 - Allow PPP PAP authentication. Default: YES
auth_chap                - Allow PPP CHAP authentication. Default: YES
auth_mschapv1            - Allow PPP MSCHAP authentication.
                           Default: YES
auth_mschapv2            - Allow PPP MSCHAPV2 authentication.
                           Default: YES
auth_eap                 - Allow PPP EAP authentication.
                           Default: YES
auth_none                - Allow unauthenticated peers.
                           Default: NO/YES (server/client)
auth_peer                - Authenticate peer PPP user (server).
                           Default: YES/NO (server/client)
chap_interval            - Rechallenge the peer every chap_interval seconds.
                           Default=0 (don't rechallenge).
chap_max_challenge       - Maximum number of CHAP challenges to transmit
                           without successful acknowledgment before
                           declaring a failure. Default=10.
chap_restart             - Retransmission timeout for CHAP challenges.
                           Default=3.
pap_max_auth_reqs        - Maximum number of PAP authenticate-request
                           transmissions. Default=10.
pap_restart_interval     - Retransmission timeout for PAP requests.
                           Default=3.
pap_timeout              - Maximum time to wait for peer to authenticate
                           itself. Default=0 (no limit).
idle_timeout             - Disconnect session if idle for more than N
                           seconds. Default=0 (no limit).
ipcp_max_cfg_reqs        - Maximum number of IPCP config-requests to
                           transmit without successful acknowledgement
                           before declaring a failure. Default=10.
ipcp_max_cfg_naks        - Maximum number of IPCP config-naks to allow
                           before starting to send config-rejects
                           instead. Default=10.
ipcp_max_term_reqs       - Maximum number of IPCP term-requests to send.
                           Default=3.
ipcp_retransmit_interval - IPCP retransmission timeout. Default=3.
lcp_echo_fail_count      - Number of LCP echo failures to accept before
                           assuming peer is down. Default=5.
lcp_echo_interval        - Send LCP echo-request to peer every N
                           seconds. Default=0 (don't send).
lcp_max_cfg_reqs         - Maximum number of LCP config-request
                           transmissions. Default=10.
lcp_max_cfg_naks         - Maximum number of LCP config-requests to
                           transmit without successful acknowledgement
                           before declaring a failure. Default=10.
lcp_max_term_reqs        - Maximum number of LCP term-requests to send.
                           Default=3.
lcp_retransmit_interval  - LCP retransmission timeout. Default=3.
max_connect_time         - Maximum connect time (in seconds) that the
                           PPP session may stay in use.Default=0 (no
                           limit)
use_radius               - Says whether to use RADIUS for user
                           authentication. Support depends on the PPP
                           implementation being used, since it is PPP
                           that issues RADIUS requests, not OpenL2TP.
radius_hint              - An arbitrary text string that is passed
                           to the RADIUS client. The meaning of such
                           string is locally significant.
ip_pool_name             - The name of an IP pool. This name is passed
                           to PPP which can use the information as it
                           chooses. IP address pools are not
                           controlled by OpenL2TP.
default_route            - Says whether the PPP link should be used
                           as the system's default route. Default: no.
multilink                - Use multilink PPP. Default: no.
local_name               - Name to use for authentication with the
                           peer, unless overridden by user_name.
remote_name              - Name to assume for the remote peer for
                           authentication purposes.

  PPP PROFILE LIST
l2tp> ppp profile list ?

  PPP PROFILE SHOW
l2tp> ppp profile show ?
profile_name - Name of ppp profile

  PPP PROFILE DELETE
l2tp> ppp profile delete ?
profile_name - Name of ppp profile

  TUNNEL CREATE
l2tp> tunnel create ?
dest_ipaddr          - Destination IP address
config_id            - Optional configuration id, used to uniquify a
                       tunnel when there is more the one tunnel between
                       the same two IP addresses
tunnel_id            - Optional tunnel id of new tunnel. Usually
                       auto-generated. Use is discouraged.
profile_name         - Name of tunnel profile which will be used for
                       default values of this tunnel's parameters.
src_ipaddr           - Source IP address
udp_port             - UDP port number with which to contact peer
                       L2TP server. Default: 1701
use_tiebreaker       - Enable use of a tiebreaker when setting up the
                       tunnel. Default: ON
allow_ppp_proxy      - Allow PPP proxy
framing_caps         - Framing capabilities:-
                       sync:async
bearer_caps          - Bearer capabilities:-
                       digital:analog
host_name            - Name to advertise to peer when setting up the
                       tunnel.
secret               - Optional secret which is shared with tunnel peer.
                       Must be specified when hide_avps is enabled.
auth_mode            - Tunnel authentication mode:-
                       none      - no authentication, unless secret
                                   is given
                       simple    - check peer hostname
                       challenge - require tunnel secret
hide_avps            - Hide AVPs. Default OFF
pmtu_discovery       - Do Path MTU Discovery. Default: OFF
trace_flags          - Trace flags, for debugging network problems
use_udp_checksums    - Use UDP checksums in data frames. Default: ON
persist              - Persist (recreate automatically if tunnel fails).
                       Default: OFF
hello_timeout        - Set timeout used for periodic L2TP Hello messages
                       (in seconds). Default: 0 (no hello messages
                       are generated.
max_retries          - max retries
rx_window_size       - Receive window size
tx_window_size       - Transmit window size
retry_timeout        - Retry timeout
idle_timeout         - Idle timeout
max_sessions         - Maximum number of sessions allowed on tunnel.
                       Default=0 (limited only by max_sessions limit in
                       system parameters).
mtu                  - MTU for all sessions in tunnel. Default: 1460.
tunnel_name          - Administrative name of this tunnel.
peer_profile_name    - Name of peer profile which will be used for
                       default values of the tunnel's parameters.
session_profile_name - Name of session profile which will be used for
                       default values of the tunnel's session parameters.

  TUNNEL MODIFY

Tunnel instances are identified by either tunnel_id or tunnel_name.
l2tp> tunnel modify ?
tunnel_id            - Tunnel ID of tunnel.
tunnel_name          - Administrative name of tunnel
trace_flags          - Trace flags, for debugging network problems
persist              - Persist (recreate automatically if tunnel fails).
                       Default: OFF
udp_csum             - Use UDP checksums in data frames. Default: ON
hello_timeout        - Set timeout used for periodic L2TP Hello
                       messages (in seconds). Default: 0 (no hello
                       messages are generated.
max_retries          - max retries
rx_window_size       - Receive window size
tx_window_size       - Transmit window size
retry_timeout        - Retry timeout
idle_timeout         - Idle timeout
max_sessions         - Maximum number of sessions allowed on tunnel.
                       Default=0 (limited only by max_sessions limit in
                       system parameters).
mtu                  - MTU for all sessions in tunnel. Default: 1460.
peer_profile_name    - Name of peer profile which will be used for
                       default values of the tunnel's parameters.
session_profile_name - Name of session profile which will be used for
                       default values of the tunnel's session parameters.
ppp_profile_name     - Name of ppp profile which will be used for
                       default values of the tunnel's session PPP
                       parameters.
interface_name       - Name of system interface for the tunnel.
                       Default: l2tpN where N is tunnel_id.
                       Not currently used.

  TUNNEL LIST
l2tp> tunnel list ?
local_only  - List only locally created tunnels.
remote_only - List only remotely created tunnels.
names       - List only named tunnels.

  TUNNEL SHOW

Tunnel instances are identified by either tunnel_id or tunnel_name.
l2tp> tunnel show ?
tunnel_id   - Tunnel ID of tunnel.
tunnel_name - Administrative name of tunnel
config      - Display only tunnel configuration/status information.
transport   - Display only tunnel transport information.

  TUNNEL DELETE

Tunnel instances are identified by either tunnel_id or tunnel_name.
l2tp> tunnel delete ?
tunnel_id   - Tunnel ID of tunnel.
tunnel_name - Administrative name of tunnel

  TUNNEL PROFILE CREATE / MODIFY / UNSET
l2tp> tunnel profile create ?
profile_name         - Name of tunnel profile
dest_ipaddr          - Destination IP address
src_ipaddr           - Source IP address
udp_port             - UDP port number with which to contact peer
                       L2TP server. Default: 1701
use_tiebreaker       - Enable use of a tiebreaker when setting up the
                       tunnel. Default: ON
allow_ppp_proxy      - Allow PPP proxy
framing_caps         - Framing capabilities:-
                       sync:async
bearer_caps          - Bearer capabilities:-
                       digital:analog
host_name            - Name to advertise to peer when setting up the
                       tunnel.
secret               - Optional secret which is shared with tunnel peer.
                       Must be specified when hide_avps is enabled.
auth_mode            - Tunnel authentication mode:-
                       none      - no authentication, unless secret is
                                   given
                       simple    - check peer hostname
                       challenge - require tunnel secret
hide_avps            - Hide AVPs. Default OFF
pmtu_discovery       - Do Path MTU Discovery. Default: OFF
trace_flags          - Trace flags, for debugging network problems
udp_csum             - Use UDP checksums in data frames. Default: ON
hello_timeout        - Set timeout used for periodic L2TP Hello
                       messages (in seconds). Default: 0 (no hello
                       messages are generated.
max_retries          - max retries
rx_window_size       - Receive window size
tx_window_size       - Transmit window size
retry_timeout        - Retry timeout
idle_timeout         - Idle timeout
max_sessions         - Maximum number of sessions allowed on tunnel.
                       Default=0 (limited only by max_sessions limit in
                       system parameters).
mtu                  - MTU for all sessions in tunnel. Default: 1460.
tunnel_name          - Administrative name of this tunnel.
peer_profile_name    - Name of peer profile which will be used for
                       default values of the tunnel's parameters.
session_profile_name - Name of session profile which will be used for
                       default values of the tunnel's session
                       parameters.
ppp_profile_name     - Name of ppp profile which will be used for
                       default values of the tunnel's session PPP
                       parameters.
interface_name       - Name of system interface for the tunnel.
                       Default: l2tpN where N is tunnel_id.
                       Not currently used.

  TUNNEL PROFILE LIST
l2tp> tunnel profile list ?

  TUNNEL PROFILE SHOW
l2tp> tunnel profile show ?
profile_name - Name of tunnel profile

  TUNNEL PROFILE DELETE
l2tp> tunnel profile delete ?
profile_name - Name of tunnel profile

  SESSION CREATE
l2tp> session create ?
tunnel_id                - Tunnel ID on which to create session.
tunnel_name              - Administrative name of tunnel on which to
                           create session.
profile_name             - Name of session profile
ppp_profile_name         - Name of ppp profile to use for PPP parameters
session_name             - Administrative name of this session
trace_flags              - Trace flags, for debugging network problems
sequencing_required      - The use of sequence numbers in the data
                           channel is mandatory.
use_sequence_numbers     - Enable sequence numbers in the data channel
                           if peer supports them.
no_ppp                   - Don't start PPP on the L2TP session.
reorder_timeout          - Timeout to wait for out-of-sequence packets
                           before discarding.
session_type             - Session type: LAC/LNS incoming/outgoing
priv_group_id            - Private group ID, used to separate this
                           session into a named administrative group
interface_name           - PPP interface name.Default: pppN
user_name                - PPP user name
user_password            - PPP user password
framing_type             - Framing type: sync, async or any.
                           Default: any
bearer_type              - Bearer type: digital, analog, any.
                           Default: any
minimum_bps              - Minimum bits/sec acceptable. Default: 0
maximum_bps              - Maximum bits/sec required.
                           Default: no limit
connect_speed            - Specified as speed[:txspeed], indicates
                           connection speeds.
session_id               - Session ID of session. Default: system
                           chooses random ID.

  SESSION MODIFY

Session instances are identified by a tunnel / session pair. The tunnel or session may be specified by id or name, i.e. tunnel_id / tunnel_name session_id / session_name.
l2tp> session modify ?
tunnel_id            - Tunnel ID on which session exists.
tunnel_name          - Administrative name of tunnel on which session exists.
session_id           - Session ID of session.
session_name         - Administrative name of this session
trace_flags          - Trace flags, for debugging network problems
sequencing_required  - The use of sequence numbers in the data channel
                       is mandatory.
use_sequence_numbers - Enable sequence numbers in the data channel if
                       peer supports them.
reorder_timeout      - Timeout to wait for out-of-sequence packets
                       before discarding.

  SESSION LIST
l2tp> session list ?
tunnel_id   - Tunnel ID on which to list sessions.
tunnel_name - Administrative name of tunnel on which session exists.
local_only  - Show only locally created sessions.
remote_only - Show only remotely created sessions.
names       - Show only named sessions.

  SESSION SHOW

Session instances are identified by a tunnel / session pair. The tunnel or session may be specified by id or name, i.e. tunnel_id / tunnel_name session_id / session_name.
l2tp> session show ?
tunnel_id    - Tunnel ID on which session exists.
tunnel_name  - Administrative name of tunnel on which session exists.
session_id   - Session ID of session.
session_name - Administrative name of session.

  SESSION DELETE

Session instances are identified by a tunnel / session pair. The tunnel or session may be specified by id or name, i.e. tunnel_id / tunnel_name session_id / session_name.
l2tp> session delete ?
tunnel_id    - Tunnel ID on which session exists.
tunnel_name  - Administrative name of tunnel on which session exists.
session_id   - Session ID of session.
session_name - Administrative name of session.

  SESSION PROFILE CREATE / MODIFY / UNSET
l2tp> session profile create ?
profile_name         - Name of session profile
ppp_profile_name     - Name of ppp profile to use for PPP parameters
session_name         - Administrative name of this session
trace_flags          - Trace flags, for debugging network problems
sequencing_required  - The use of sequence numbers in the data channel
                       is mandatory.
use_sequence_numbers - Enable sequence numbers in the data channel if
                       peer supports them.
no_ppp               - Don't start PPP on the L2TP session.
reorder_timeout      - Timeout to wait for out-of-sequence packets
                       before discarding.
session_type         - Session type: LAC/LNS incoming/outgoing
priv_group_id        - Private group ID, used to separate this session
                       into a named administrative group
framing_type         - Framing type: sync, async or any.
                       Default: any
bearer_type          - Bearer type: digital, analog, any.
                       Default: any
minimum_bps          - Minimum bits/sec acceptable. Default: 0
maximum_bps          - Maximum bits/sec required. Default: no limit
connect_speed        - Specified as speed[:txspeed, indicates
                       connection speeds.

  SESSION PROFILE LIST
l2tp> session profile list ?

  SESSION PROFILE SHOW
l2tp> session profile show ?
profile_name - Name of session profile

  SESSION PROFILE DELETE
l2tp> session profile delete ?
profile_name - Name of session profile

  USER LIST
l2tp> user list ?

  SYSTEM MODIFY
l2tp> system modify ?
trace_flags                  - Default trace flags to use if not
                               otherwise overridden.
max_tunnels                  - Maximum number of tunnels permitted.
                               Default=0 (no limit).
max_sessions                 - Maximum number of sessions permitted.
                               Default=0 (no limit).
drain_tunnels                - Enable the draining of existing tunnels
                               (prevent new tunnels from being created.
tunnel_establish_timeout     - Timeout for tunnel establishment.
                               Default=120 seconds..
session_establish_timeout    - Timeout for session establishment.
                               Default=120 seconds..
tunnel_persist_pend_timeout  - Timeout to hold persistent tunnels before
                               retrying. Default=300 seconds.
session_persist_pend_timeout - Timeout to hold persistent sessions before
                               retrying. Default=60 seconds.
deny_local_tunnel_creates    - Deny the creation of new tunnels by local
                               request.
deny_remote_tunnel_creates   - Deny the creation of new tunnels by remote
                               peers.
reset_statistics             - Reset statistics.

  SYSTEM SHOW
l2tp> system show ?
configuration - show system configuration
version       - show system version
statistics    - show system statistics
status        - show system status

  DEBUG MODIFY
May be used to modify an object's trace_flags instead of manipulating the trace_flags directly with one of the above modify commands. The debug commands hide the detail of the trace_flags bitmask from the operator since trace options are controlled by CLI keywords. Only one object may be modified with one command.
l2tp> debug modify ?
tunnel_id            - tunnel_id of entity being modified
tunnel_name          - tunnel_name of entity being modified
session_id           - session_id of entity being modified
session_name         - session_name of entity being modified
tunnel_profile_name  - Name of tunnel profile being modified
session_profile_name - Name of session profile being modified
ppp_profile_name     - Name of ppp profile being modified
app                  - Modify application debug settings
protocol             - L2TP protocol events
fsm                  - Finite State Machine events (e.g. state changes)
api                  - Management interface interactions
transport            - Log tunnel transport activity, e.g. packet
                       sequence numbers, packet receive and transmit, to
                       debug
                       tunnel link establishment or failures
data                 - Log L2TP data channel activity. Only L2TP control
                       messages are logged, never user data packets.
ppp_control          - Enables trace of PPP packets from the PPP subsystem
avp_data             - L2TP Attribute Value Pairs (AVPs) data contentsFor
                       detailed message content trace
avp_hide             - Show AVP hiding details
avp_info             - High level AVP info (shows AVPs present, not their
                       contents)
func                 - Internal functional behavior
system               - Low level system activity, e.g. timers, sockets etc

  DEBUG SHOW
l2tp> debug show ?
tunnel_id            - tunnel_id of entity being shown
tunnel_name          - tunnel_name of entity being shown
session_id           - session_id of entity being shown
session_name         - session_name of entity being shown
tunnel_profile_name  - Name of tunnel profile being shown
session_profile_name - Name of session profile being shown
ppp_profile_name     - Name of ppp profile being shown
app                  - Show application debug settings

  SERVER MODIFY
l2tp> server modify ?
name - IP address or hostname of L2TP daemon to attach to. Default=localhost.

  CONFIG SAVE
l2tp> config save ?
file   - Filename for save/restore operation.

  CONFIG RESTORE
l2tp> config restore ?
file   - Filename for save/restore operation.

EXAMPLES

Create an L2TP tunnel to a remote LNS 1.2.3.4 which requires no authentication. Add a session using PPP username/password myuser/mypassword

l2tp> tunnel create dest_ipaddr=1.2.3.4
    Created tunnel 39767
    l2tp> session create tunnel_id=39767 user_name=myuser \
    	password=mypassword
    Created session 39767/10287

Create an L2TP tunnel to a remote LNS which requires authentication using shared secret 'mypassword'.

l2tp> tunnel create dest_ipaddr=1.2.3.4 secret=mypassword
Created tunnel 4964
l2tp> session create tunnel_id=39767 user_name=myuser \
	password=mypassword
Created session 4964/54933

Setup an LNS that accepts tunnels only from IP addresses in the subnet 1.2.3.0/24 and from hostname 'one'. For hostname 'one', enable L2TP data sequence numbers, use tunnel authentication, enable AVP hiding and send a PPP LCP echo every 5 seconds.

l2tp> peer profile create profile_name=mysubnet \
	ip_addr=1.2.3.0 netmask=255.255.255.0
Created peer profile mysubnet
l2tp> peer profile create profile_name=one \
	default_tunnel_profile=one \
	default_session_profile=one \
	default_ppp_profile=one
Created peer profile one
l2tp> tunnel profile modify profile_name=default \
	auth_mode=simple
Modified tunnel profile default
l2tp> tunnel profile create profile_name=one \
	hide_avps=yes secret=mysecret auth_mode=challenge
Created tunnel profile one
l2tp> session profile create profile_name=one \
	use_data_sequencing=yes
Created session profile one
l2tp> ppp profile create profile_name=one \
	lcp_echo_interval=5
Created ppp profile one

Enable debug trace for tunnels from peer 'one' to debug tunnel setup problems.

l2tp> tunnel profile modify profile_name=one \
	trace_flags=protocol,fsm,api,avp,data,ppp
Modified tunnel profile one

Enable PROTOCOL/FSM and disable DATA debug trace for tunnels from peer 'one', leaving existing trace settings of the profile unchanged.

l2tp> debug modify tunnel_profile_name=one \
	protocol=on fsm=on data=off

Display a list of active tunnels and show detail about one of them.

l2tp> tunnel list
   TunId             Peer            Local  PeerTId ConfigId            State
*  53502      192.168.0.1      192.168.0.2    55348        1      ESTABLISHED
   20903    192.168.0.253      192.168.0.2    33790        1      ESTABLISHED

Tunnels marked with * in the first column are those created by remote request. Their parameters may be displayed or modified using the same commands as are used for locally created tunnels.
l2tp> tunnel show tunnel_id=20903
Tunnel 20903, from 192.168.0.2 to 192.168.0.253:-
  state: ESTABLISHED
  created at:  Aug 31 11:04:55 2005
  administrative name: 'one'
  created by admin: YES, tunnel mode: LAC
  peer tunnel id: 33790, host name: NOT SET
  UDP ports: local 32771, peer 1701
  authorization mode: NONE, hide AVPs: OFF, allow PPP proxy: OFF
  tunnel secret: 'wibble'
  session limit: 0, session count: 2
  tunnel profile: default, peer profile: default
  session profile: default, ppp profile: default
  hello timeout: 60, retry timeout: 1, idle timeout: 0
  rx window size: 10, tx window size: 10, max retries: 5
  use udp checksums: OFF
  do pmtu discovery: OFF, mtu: 1460
  framing capability: SYNC, bearer capability: DIGITAL
  use tiebreaker: OFF
  trace flags: NONE
  peer vendor name: Cisco Systems, Inc.
  peer protocol version: 1.0, firmware 4384
  peer framing capability: NONE
  peer bearer capability: NONE
  peer rx window size: 800
  Transport status:-
    ns/nr: 5/2, peer 5/2
    cwnd: 6, ssthresh: 10, congpkt_acc: 0
  Transport statistics:-
    out-of-sequence control/data discards: 0/0
    zlbs tx/txfail/rx: 2/0/3
    retransmits: 0, duplicate pkt discards: 0, data pkt discards: 0
    hellos tx/txfail/rx: 1/0/0
    control rx packets: 5, rx bytes: 194
    control tx packets: 7, tx bytes: 303
    data rx packets: 15, rx bytes: 347, rx errors: 0
    data tx packets: 15, tx bytes: 298, tx errors: 0
    establish retries: 0
l2tp> tunnel show tunnel_id=53502 config
Tunnel 53502, from 192.168.0.2 to 192.168.0.1:-
  state: ESTABLISHED
  created at:  Aug 31 11:09:20 2005
  created by admin: NO, tunnel mode: LNS
  peer tunnel id: 55348, host name: NOT SET
  UDP ports: local 32772, peer 34215
  authorization mode: NONE, hide AVPs: OFF, allow PPP proxy: OFF
  session limit: 0, session count: 0
  tunnel profile: default, peer profile: default
  session profile: default, ppp profile: default
  hello timeout: 60, retry timeout: 1, idle timeout: 0
  rx window size: 10, tx window size: 10, max retries: 5
  use udp checksums: OFF
  do pmtu discovery: OFF, mtu: 1460
  framing capability: SYNC, bearer capability: DIGITAL
  use tiebreaker: OFF
  trace flags: NONE
  peer vendor name: Katalix Systems Ltd. Linux-2.4.27 (i386)
  peer protocol version: 1.0, firmware 1
  peer framing capability: SYNC ASYNC
  peer bearer capability: DIGITAL ANALOG
  peer rx window size: 10
l2tp> session list tunnel_name=one
2 sessions on tunnel one:-
	29680
	4386
l2tp> session show tunnel_name=one session_id=29680
Session 29680 on tunnel 20903:-
  type: LAC Incoming Call, state: ESTABLISHED
  created at:  Aug 31 11:04:59 2005
  administrative name: one
  created by admin: YES, peer session id: 5
  ppp user name: cisco
  ppp user password: cisco
  ppp profile name: one
  data sequencing required: OFF
  use data sequence numbers: OFF
  trace flags: NONE
  framing types: SYNC ASYNC
  bearer types: DIGITAL ANALOG
  call serial number: 4
  use ppp proxy: NO
  Peer configuration data:-
    data sequencing required: OFF
    framing types:
    bearer types:
    call serial number: 4
  data rx packets: 1582, rx bytes: 1094667, rx errors: 0
  data tx packets: 1582, tx bytes: 1088350, tx errors: 0

Display a brief list of incoming tunnels.

l2tp> tunnel list remote_only
        53502

This form of the tunnel list command can be useful in scripts to derive active incoming tunnel_ids to pass to another command.

Display a brief list of outgoing tunnels.

l2tp> tunnel list local_only
        20903

This form of the tunnel list command can be useful in scripts to derive active outgoing tunnel_ids to pass to another command.

Display a brief list of outgoing tunnels.

l2tp> tunnel list names
        one

This form of the tunnel list command can be useful in scripts to derive active named tunnels to pass to another command. The names may be used in combination with local_only or remote_only to restrict the list to only named tunnels.

The local_only, remote_only and names keywords may also be used with the session list command.

l2tp> session list tunnel_name=one local_only names
        one
        two

Configure OpenL2TP for use only as a client. Do not accept any incoming tunnel setup requests from the network, regardless of other configuration.

l2tp> system modify deny_remote_tunnel_creates=yes

Configure OpenL2TP to use a fixed local UDP port. This is sometimes necessary to pass through some firewalls and NAT implementations. Cisco use a fixed local UDP port by default. OpenL2TP uses ephemeral ports by default, which allows multiple tunnels between the same L2TP peers.

l2tp> tunnel profile modify profile_name=default our_udp_port=1701

Configure OpenL2TP to allocate IP addresses out of a local address pool called one.

Start ippoold(8) and configure a pool called one. Then

l2tp> ppp profile modify profile_name=default ip_pool_name=one

Configure OpenL2TP to use RADIUS to do PPP authentication. Specify a non-default RADIUS client configuration parameter file.

l2tp> ppp profile modify profile_name=default \
        use_radius=yes \
        radius_hint=/etc/radiusclient/myradiusclient.conf

FILES
~/.l2tp_history

REPORTING BUGS
Please report bugs to <openl2tp-bugs@lists.sourceforge.net>.

SEE ALSO
openl2tp(7), openl2tpd(8), readline(3).