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- #
- # Layer Two Tunneling Protocol (L2TP)
- #
- menuconfig L2TP
- tristate "Layer Two Tunneling Protocol (L2TP)"
- depends on INET
- ---help---
- Layer Two Tunneling Protocol
- From RFC 2661 <http://www.ietf.org/rfc/rfc2661.txt>.
- L2TP facilitates the tunneling of packets across an
- intervening network in a way that is as transparent as
- possible to both end-users and applications.
- L2TP is often used to tunnel PPP traffic over IP
- tunnels. One IP tunnel may carry thousands of individual PPP
- connections. L2TP is also used as a VPN protocol, popular
- with home workers to connect to their offices.
- L2TPv3 allows other protocols as well as PPP to be carried
- over L2TP tunnels. L2TPv3 is defined in RFC 3931
- <http://www.ietf.org/rfc/rfc3931.txt>.
- The kernel component handles only L2TP data packets: a
- userland daemon handles L2TP the control protocol (tunnel
- and session setup). One such daemon is OpenL2TP
- (http://openl2tp.org/).
- If you don't need L2TP, say N. To compile all L2TP code as
- modules, choose M here.
- config L2TP_DEBUGFS
- tristate "L2TP debugfs support"
- depends on L2TP && DEBUG_FS
- help
- Support for l2tp directory in debugfs filesystem. This may be
- used to dump internal state of the l2tp drivers for problem
- analysis.
- If unsure, say 'Y'.
- To compile this driver as a module, choose M here. The module
- will be called l2tp_debugfs.
- config L2TP_V3
- bool "L2TPv3 support (EXPERIMENTAL)"
- depends on EXPERIMENTAL && L2TP
- help
- Layer Two Tunneling Protocol Version 3
- From RFC 3931 <http://www.ietf.org/rfc/rfc3931.txt>.
- The Layer Two Tunneling Protocol (L2TP) provides a dynamic
- mechanism for tunneling Layer 2 (L2) "circuits" across a
- packet-oriented data network (e.g., over IP). L2TP, as
- originally defined in RFC 2661, is a standard method for
- tunneling Point-to-Point Protocol (PPP) [RFC1661] sessions.
- L2TP has since been adopted for tunneling a number of other
- L2 protocols, including ATM, Frame Relay, HDLC and even raw
- ethernet frames.
- If you are connecting to L2TPv3 equipment, or you want to
- tunnel raw ethernet frames using L2TP, say Y here. If
- unsure, say N.
- config L2TP_IP
- tristate "L2TP IP encapsulation for L2TPv3"
- depends on L2TP_V3
- help
- Support for L2TP-over-IP socket family.
- The L2TPv3 protocol defines two possible encapsulations for
- L2TP frames, namely UDP and plain IP (without UDP). This
- driver provides a new L2TPIP socket family with which
- userspace L2TPv3 daemons may create L2TP/IP tunnel sockets
- when UDP encapsulation is not required. When L2TP is carried
- in IP packets, it used IP protocol number 115, so this port
- must be enabled in firewalls.
- To compile this driver as a module, choose M here. The module
- will be called l2tp_ip.
- config L2TP_ETH
- tristate "L2TP ethernet pseudowire support for L2TPv3"
- depends on L2TP_V3
- help
- Support for carrying raw ethernet frames over L2TPv3.
- From RFC 4719 <http://www.ietf.org/rfc/rfc4719.txt>.
- The Layer 2 Tunneling Protocol, Version 3 (L2TPv3) can be
- used as a control protocol and for data encapsulation to set
- up Pseudowires for transporting layer 2 Packet Data Units
- across an IP network [RFC3931].
- This driver provides an ethernet virtual interface for each
- L2TP ethernet pseudowire instance. Standard Linux tools may
- be used to assign an IP address to the local virtual
- interface, or add the interface to a bridge.
- If you are using L2TPv3, you will almost certainly want to
- enable this option.
- To compile this driver as a module, choose M here. The module
- will be called l2tp_eth.
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