NAME

       osmo-ggsn - Gateway GPRS Support Node.

SYNOPSIS

       osmo-ggsn --help

       osmo-ggsn --version

       osmo-ggsn [ --help ] [ --daemonize ] [ --config-file file ] [ --version ]

DESCRIPTION

       osmo-ggsn  is  part  of  the  OsmoGGSN project, and implements a Gateway GPRS Support Node. It is used by
       mobile operators as the interface between the Internet and the rest of the mobile network infrastructure.

       The GPRS functionality and protocols has been standardised by the Third  Generation  Partnership  Project
       (3GPP).  According  to  the 3GPP specifications a GGSN has two interfaces: The Gn/Gp interface and the Gi
       interface.

       The Gn/Gp interface can be seen as the downlink interface of the GGSN. It is used for communicating  with
       the  Serving  GPRS  Support  Node  (SGSN)  which  again interfaces to the radio access network. The Gn/Gp
       interface uses the GPRS tunneling protocol (GTP). User data packets (typically IP packets)  are  tunneled
       over GTP, which again uses UDP over IP.

       The  other  interface  can  be thought of as the uplink interface, and interfaces the GGSN to an external
       data network. Gi is most often an interface to the Internet.  osmo-ggsn uses the TUN/TAP driver  for  the
       Gi interface. A tun network interface is established when the osmo-ggsn is started.

       osmo-ggsn  will accept incoming connections from mobile stations through the radio access network and the
       SGSN. When a connection request is received the ggsn will allocate a dynamic IP address  for  the  mobile
       station,  and  allow  the mobile station to access the Gi interface. Connections are terminated by either
       the mobile station or the SGSN. Runtime errors are reported using the Osmocom logging framework.

       Typically osmo-ggsn will be deployed with two Ethernet interfaces. One for the Gn/Gp interface,  and  one
       for  the  Gi  interface. Policy routing and firewall rules should be used in order to separate Gi traffic
       from Gn/Gp traffic.

OPTIONS

       --help Print help and exit.

       --version
              Print version and exit.

       --daemonize
              Run in background as a daemon (default = off)

       --config-file file
              Read configuration file (default = ./openggsn.cfg)

FILES

       ./osmo-ggsn.cfg
              The configuration file for osmo-ggsn.
       /var/run/osmo-ggsn.pid
              Process ID file.
       /var/lib/osmo-ggsn
              Directory holding nonvolatile data.

BUGS

       Report all bugs to the OsmoGGSN bug tracking list at https://osmocom.org/projects/openggsn

       osmo-ggsn has very limited management support. Currently both SNMP as  well  as  billing  mechanisms  are
       missing.

SEE ALSO

       sgsnemu(8)

NOTES

       Besides  the  long  options  documented in this man page osmo-ggsn also accepts a number of short options
       with the same functionality. Use osmo-ggsn --help for a full list of all the available options.

       The TUN/TAP driver is required for proper operation of osmo-ggsn.  For linux kernels later than 2.4.7 the
       TUN/TAP driver is included in the kernel, but typically needs to be loaded manually  with  modprobe  tun.
       For  automatic loading the line alias char-major-10-200 tun can be added to /etc/modules.conf.  For other
       platforms see http://vtun.sourceforge.net/tun/ for information on how to install and  configure  the  tun
       driver.

       osmo-ggsn uses the GPRS Tunneling Protocol (GTP) as specified by the Third Generation Partnership Project
       (3GPP). 3GPP protocols specifications can be found at http://www.3gpp.org

COPYRIGHT

       Copyright (C) 2002, 2003 by Mondru AB.  Copyright (C) 2017 Harald Welte

       The  contents  of  this  file  may  be  used under the terms of the GNU General Public License Version 2,
       provided that the above copyright notice and  this  permission  notice  is  included  in  all  copies  or
       substantial portions of the software.

AUTHORS

       Jens Jakobsen <jj@openggsn.org> Harald Welte <laforge@gnumonks.org>

                                                   August 2017                                      osmo-ggsn(8)