2# Layer Two Tunneling Protocol (L2TP)
   5menuconfig L2TP
   6        tristate "Layer Two Tunneling Protocol (L2TP)"
   7        depends on (IPV6 || IPV6=n)
   8        depends on INET
   9        ---help---
  10          Layer Two Tunneling Protocol
  12          From RFC 2661 <>.
  14          L2TP facilitates the tunneling of packets across an
  15          intervening network in a way that is as transparent as
  16          possible to both end-users and applications.
  18          L2TP is often used to tunnel PPP traffic over IP
  19          tunnels. One IP tunnel may carry thousands of individual PPP
  20          connections. L2TP is also used as a VPN protocol, popular
  21          with home workers to connect to their offices.
  23          L2TPv3 allows other protocols as well as PPP to be carried
  24          over L2TP tunnels. L2TPv3 is defined in RFC 3931
  25          <>.
  27          The kernel component handles only L2TP data packets: a
  28          userland daemon handles L2TP the control protocol (tunnel
  29          and session setup). One such daemon is OpenL2TP
  30          (
  32          If you don't need L2TP, say N. To compile all L2TP code as
  33          modules, choose M here.
  35config L2TP_DEBUGFS
  36        tristate "L2TP debugfs support"
  37        depends on L2TP && DEBUG_FS
  38        help
  39          Support for l2tp directory in debugfs filesystem. This may be
  40          used to dump internal state of the l2tp drivers for problem
  41          analysis.
  43          If unsure, say 'Y'.
  45          To compile this driver as a module, choose M here. The module
  46          will be called l2tp_debugfs.
  48config L2TP_V3
  49        bool "L2TPv3 support (EXPERIMENTAL)"
  50        depends on EXPERIMENTAL && L2TP
  51        help
  52          Layer Two Tunneling Protocol Version 3
  54          From RFC 3931 <>.
  56          The Layer Two Tunneling Protocol (L2TP) provides a dynamic
  57          mechanism for tunneling Layer 2 (L2) "circuits" across a
  58          packet-oriented data network (e.g., over IP).  L2TP, as
  59          originally defined in RFC 2661, is a standard method for
  60          tunneling Point-to-Point Protocol (PPP) [RFC1661] sessions.
  61          L2TP has since been adopted for tunneling a number of other
  62          L2 protocols, including ATM, Frame Relay, HDLC and even raw
  63          ethernet frames.
  65          If you are connecting to L2TPv3 equipment, or you want to
  66          tunnel raw ethernet frames using L2TP, say Y here. If
  67          unsure, say N.
  69config L2TP_IP
  70        tristate "L2TP IP encapsulation for L2TPv3"
  71        depends on L2TP_V3
  72        help
  73          Support for L2TP-over-IP socket family.
  75          The L2TPv3 protocol defines two possible encapsulations for
  76          L2TP frames, namely UDP and plain IP (without UDP). This
  77          driver provides a new L2TPIP socket family with which
  78          userspace L2TPv3 daemons may create L2TP/IP tunnel sockets
  79          when UDP encapsulation is not required. When L2TP is carried
  80          in IP packets, it used IP protocol number 115, so this port
  81          must be enabled in firewalls.
  83          To compile this driver as a module, choose M here. The module
  84          will be called l2tp_ip.
  86config L2TP_ETH
  87        tristate "L2TP ethernet pseudowire support for L2TPv3"
  88        depends on L2TP_V3
  89        help
  90          Support for carrying raw ethernet frames over L2TPv3.
  92          From RFC 4719 <>.
  94          The Layer 2 Tunneling Protocol, Version 3 (L2TPv3) can be
  95          used as a control protocol and for data encapsulation to set
  96          up Pseudowires for transporting layer 2 Packet Data Units
  97          across an IP network [RFC3931].
  99          This driver provides an ethernet virtual interface for each
 100          L2TP ethernet pseudowire instance. Standard Linux tools may
 101          be used to assign an IP address to the local virtual
 102          interface, or add the interface to a bridge.
 104          If you are using L2TPv3, you will almost certainly want to
 105          enable this option.
 107          To compile this driver as a module, choose M here. The module
 108          will be called l2tp_eth.
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