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Man Pages

Manual Reference Pages  -  L2TPD.CONF (5)


l2tpd.conf - L2TPD configuration file



The l2tpd.conf file contains configuration information for l2tpd, the implementation of l2tp protocol.

The configuration file is composed of sections and parameters. Each section has a given name which will be used when using the configuration FIFO (normaly /var/run/l2tp-control). See l2tpd.8 for more details.

The specific given name default will specify parameters applicables for all the following sections.


auth file
  Specify where to find the authentication file used to authenticate l2tp tunnels. The default is /usr/local/etc/l2tp/l2tp-secrets.

  Specify which IP address l2tpd should use. The default is all addresses.

Port Specify which udp port l2tpd should use. The default is 1701.

access control
  If set to use, the l2tpd process will only accept connections from peers addresses specified in the following sections. CHECK


  If set to yes, only one control tunnel will be allowed to be built between 2 peers. CHECK

(no) ip range
  Specify the range of ip addresses the LNS will assign to the connecting LAC PPP tunnels. Multiple ranges can be defined. Using the ’no’ statement disallows the use of that particular range. Ranges are defined using the format IP - IP (example: -

(no) lac
  Specify the ip addresses of LAC’s which are allowed to connect to l2tpd acting as a LNS. The format is the same as the ip range option.

hidden bit
  If set to yes, l2tpd will use the AVP hiding feature of L2TP. To get more information about hidden AVP’s and AVP in general, refer to rfc2661 (add URL?)

local ip
  Use the following IP as l2tpd’s own ip address.

length bit
  If set to yes, the length bit present in the l2tp packet payload will be used.

(refuse | require) chap
  Will require or refuse the remote peer to get authenticated via CHAP for the ppp authentication.

(refuse | require) pap
  Will require or refuse the remote peer to get authenticated via PAP for the ppp authentication.

(refuse | require) authentication
  Will require or refuse the remote peer to authenticate itself.

unix authentication
  If set to yes, /etc/passwd will be used for remote peer ppp authentication.

  Will report this as the l2tpd hostname in negociation.

ppp debug
  This will enable the debug for pppd.

  Specify the path for a file which contains pppd configuration parameters to be used.

call rws
  This option is deprecated and no longer functions. It used to be used to define the flow control window size for individual L2TP calls or sessions. The L2TP standard (RFC2661) no longer defines flow control or window sizes on calls or sessions.

tunnel rws
  This defines the window size of the control channel. The window size is defined as the number of outstanding unacknowledged packets, not as a number of bytes.

flow bits
  If set to yes, sequence numbers will be included in the communication. The feature to use sequence numbers in sessions is currently broken and does not function.

  If set to yes, use challenge authentication to authenticate peer.


The following are LAC specific configuration flags. Most of those described in the LNS section may be used in a LAC context, where it make common sense (essentially l2tp procotols tuning flags and authentication / ppp related ones).

lns Set the dns name or ip address of the LNS to connect to.

redial If set to yes, l2tpd will attemps to redial if the call get disconected.

redial timeout
  Wait X seconds before redial. The redial option must be set to yes to use this option.

max redial
  Will give up redial tries after X attempts.


/usr/local/etc/l2tp/l2tpd.conf /usr/local/etc/l2tp/l2tp-secrets /var/run/l2tp-control


Please address bugs and comment to




Jeff McAdams <>

Previous development was hosted at sourceforge ( by:

Scott Balmos <>
David Stipp <>
Jeff McAdams <>

Based off of l2tpd version 0.60
Copyright (C)1998 Adtran, Inc.
Mark Spencer <>

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Jean-Francois Dive L2TPD.CONF (5)

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