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Linux/net/l2tp/Kconfig

  1 #
  2 # Layer Two Tunneling Protocol (L2TP)
  3 #
  4 
  5 menuconfig 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
 11 
 12           From RFC 2661 <http://www.ietf.org/rfc/rfc2661.txt>.
 13 
 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.
 17 
 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.
 22 
 23           L2TPv3 allows other protocols as well as PPP to be carried
 24           over L2TP tunnels. L2TPv3 is defined in RFC 3931
 25           <http://www.ietf.org/rfc/rfc3931.txt>.
 26 
 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           (http://openl2tp.org/).
 31 
 32           If you don't need L2TP, say N. To compile all L2TP code as
 33           modules, choose M here.
 34 
 35 config 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.
 42 
 43           If unsure, say 'Y'.
 44 
 45           To compile this driver as a module, choose M here. The module
 46           will be called l2tp_debugfs.
 47 
 48 config L2TP_V3
 49         bool "L2TPv3 support"
 50         depends on L2TP
 51         help
 52           Layer Two Tunneling Protocol Version 3
 53 
 54           From RFC 3931 <http://www.ietf.org/rfc/rfc3931.txt>.
 55 
 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.
 64 
 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.
 68 
 69 config L2TP_IP
 70         tristate "L2TP IP encapsulation for L2TPv3"
 71         depends on L2TP_V3
 72         help
 73           Support for L2TP-over-IP socket family.
 74 
 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.
 82 
 83           To compile this driver as a module, choose M here. The module
 84           will be called l2tp_ip.
 85 
 86 config 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.
 91 
 92           From RFC 4719 <http://www.ietf.org/rfc/rfc4719.txt>.
 93 
 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].
 98 
 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.
103 
104           If you are using L2TPv3, you will almost certainly want to
105           enable this option.
106 
107           To compile this driver as a module, choose M here. The module
108           will be called l2tp_eth.

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