NAME

       xl2tpd - Layer 2 Tunneling Protocol Daemon.

DESCRIPTION

       xl2tpd  is an implementation of the Layer 2 Tunneling Protocol (RFC 2661).  L2TP allows to
       tunnel PPP over UDP. Some ISPs use L2TP to  tunnel  user  sessions  from  dial-in  servers
       (modem  banks,  ADSL  DSLAMs)  to  back-end PPP servers.  Another important application is
       Virtual Private Networks (VPN) where the  IPsec  protocol  is  used  to  secure  the  L2TP
       connection (L2TP/IPsec, RFC 3193).

       xl2tpd  works  by opening a pseudo-tty for communicating with pppd.  It runs completely in
       userspace but supports kernel mode L2TP.

       xl2tpd supports IPsec SA Reference tracking to enable overlapping internak NAT'ed IP's  by
       different clients (eg all clients connecting from their linksys internal IP 192.168.1.101)
       as well as multiple clients behind the same NAT router.

       This implementation is based on L2TPd  0.61  from  http://www.marko.net/l2tp  and  patches
       collected by Jacco de Leeuw at http://www.jacco2.dds.nl/networking/openswan-l2tp.html.

OPTIONS

       -D     This option prevents xl2tpd from detaching from the terminal and daemonizing.

       -l     This option tells xl2tpd to use syslog for logging even when -D was specified.

       -c <config_file>
              Set    an    alternate    config    file.     Fallback    configuration   file   is
              /etc/l2tpd/l2tpd.conf.

       -s <secret_file>
              Tells xl2tpd to use an alternate "secrets" file.

       -p <pid_file>
              Set an alternate pid file.  Default is /var/run/xl2tpd/xl2tpd.pid.

       -C <control_file>
              Set an alternate control file.

FILES

       /etc/xl2tpd/xl2tpd.conf
              Configuration file of xl2tpd, used by default.

       /etc/xl2tpd/l2tp-secrets
              Secrets file, used by default.

       /var/run/xl2tpd/l2tp-control
              Control file, used by default.

BUGS

       Please use the github project page https://github.com/xelerance/xl2tpd to send bugreports,
       issues and any other feedback.

SEE ALSO

       xl2tpd.conf(5), xl2tpd-control(8), pppd(8)

COPYLEFT

       This program is free software; you can redistribute it and/or modify it under the terms of
       the GNU General Public License as  published  by  the  Free  Software  Foundation;  either
       version 2 of the License, or (at your option) any later version.

       This  program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
       without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE.
       See the GNU General Public License for more details.

       You  should have received a copy of the GNU General Public License along with this program
       (see the file  LICENSE);  if  not,  see  https://www.gnu.org/licenses/,  or  contact  Free
       Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

CONTRIBUTORS

       Alexander Dorokhov <alex.dorokhov@gmail.com>
       Alexander Naumov <alexander_naumov@opensuse.org>

AUTHORS

       Forked from l2tpd by Xelerance: https://github.com/xelerance/xl2tpd

       Michael Richardson <mcr@xelerance.com>
       Paul Wouters <paul@xelerance.com>
       Samir Hussain <shussain@xelerance.com>

       Previous development was hosted at sourceforge (http://www.sourceforge.net/projects/l2tpd)
       by:

       Scott Balmos <sbalmos@iglou.com>
       David Stipp <dstipp@one.net>
       Jeff McAdams <jeffm@iglou.com>

       Based off of l2tpd version 0.61.  Many  thanks  to  Jacco  de  Leeuw  <jacco2@dds.nl>  for
       maintaining l2tpd.
       Copyright (C)1998 Adtran, Inc.
       Mark Spencer <markster@marko.net>

                                             Jan 2022                                   xl2tpd(8)