2# Layer Two Tunneling Protocol (L2TP)
   5menuconfig L2TP
   6        tristate "Layer Two Tunneling Protocol (L2TP)"
   7        depends on INET
   8        ---help---
   9          Layer Two Tunneling Protocol
  11          From RFC 2661 <>.
  13          L2TP facilitates the tunneling of packets across an
  14          intervening network in a way that is as transparent as
  15          possible to both end-users and applications.
  17          L2TP is often used to tunnel PPP traffic over IP
  18          tunnels. One IP tunnel may carry thousands of individual PPP
  19          connections. L2TP is also used as a VPN protocol, popular
  20          with home workers to connect to their offices.
  22          L2TPv3 allows other protocols as well as PPP to be carried
  23          over L2TP tunnels. L2TPv3 is defined in RFC 3931
  24          <>.
  26          The kernel component handles only L2TP data packets: a
  27          userland daemon handles L2TP the control protocol (tunnel
  28          and session setup). One such daemon is OpenL2TP
  29          (
  31          If you don't need L2TP, say N. To compile all L2TP code as
  32          modules, choose M here.
  34config L2TP_DEBUGFS
  35        tristate "L2TP debugfs support"
  36        depends on L2TP && DEBUG_FS
  37        help
  38          Support for l2tp directory in debugfs filesystem. This may be
  39          used to dump internal state of the l2tp drivers for problem
  40          analysis.
  42          If unsure, say 'Y'.
  44          To compile this driver as a module, choose M here. The module
  45          will be called l2tp_debugfs.
  47config L2TP_V3
  48        bool "L2TPv3 support (EXPERIMENTAL)"
  49        depends on EXPERIMENTAL && L2TP
  50        help
  51          Layer Two Tunneling Protocol Version 3
  53          From RFC 3931 <>.
  55          The Layer Two Tunneling Protocol (L2TP) provides a dynamic
  56          mechanism for tunneling Layer 2 (L2) "circuits" across a
  57          packet-oriented data network (e.g., over IP).  L2TP, as
  58          originally defined in RFC 2661, is a standard method for
  59          tunneling Point-to-Point Protocol (PPP) [RFC1661] sessions.
  60          L2TP has since been adopted for tunneling a number of other
  61          L2 protocols, including ATM, Frame Relay, HDLC and even raw
  62          ethernet frames.
  64          If you are connecting to L2TPv3 equipment, or you want to
  65          tunnel raw ethernet frames using L2TP, say Y here. If
  66          unsure, say N.
  68config L2TP_IP
  69        tristate "L2TP IP encapsulation for L2TPv3"
  70        depends on L2TP_V3
  71        help
  72          Support for L2TP-over-IP socket family.
  74          The L2TPv3 protocol defines two possible encapsulations for
  75          L2TP frames, namely UDP and plain IP (without UDP). This
  76          driver provides a new L2TPIP socket family with which
  77          userspace L2TPv3 daemons may create L2TP/IP tunnel sockets
  78          when UDP encapsulation is not required. When L2TP is carried
  79          in IP packets, it used IP protocol number 115, so this port
  80          must be enabled in firewalls.
  82          To compile this driver as a module, choose M here. The module
  83          will be called l2tp_ip.
  85config L2TP_ETH
  86        tristate "L2TP ethernet pseudowire support for L2TPv3"
  87        depends on L2TP_V3
  88        help
  89          Support for carrying raw ethernet frames over L2TPv3.
  91          From RFC 4719 <>.
  93          The Layer 2 Tunneling Protocol, Version 3 (L2TPv3) can be
  94          used as a control protocol and for data encapsulation to set
  95          up Pseudowires for transporting layer 2 Packet Data Units
  96          across an IP network [RFC3931].
  98          This driver provides an ethernet virtual interface for each
  99          L2TP ethernet pseudowire instance. Standard Linux tools may
 100          be used to assign an IP address to the local virtual
 101          interface, or add the interface to a bridge.
 103          If you are using L2TPv3, you will almost certainly want to
 104          enable this option.
 106          To compile this driver as a module, choose M here. The module
 107          will be called l2tp_eth.
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