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James Chapmanfd558d12010-04-02 06:18:33 +00001#
2# Layer Two Tunneling Protocol (L2TP)
3#
4
5menuconfig L2TP
6 tristate "Layer Two Tunneling Protocol (L2TP)"
7 depends on INET
8 ---help---
9 Layer Two Tunneling Protocol
10
11 From RFC 2661 <http://www.ietf.org/rfc/rfc2661.txt>.
12
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.
16
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.
21
James Chapmanf7faffa2010-04-02 06:18:49 +000022 L2TPv3 allows other protocols as well as PPP to be carried
23 over L2TP tunnels. L2TPv3 is defined in RFC 3931
24 <http://www.ietf.org/rfc/rfc3931.txt>.
25
James Chapmanfd558d12010-04-02 06:18:33 +000026 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 (http://openl2tp.org/).
30
31 If you don't need L2TP, say N. To compile all L2TP code as
32 modules, choose M here.
James Chapmanf7faffa2010-04-02 06:18:49 +000033
34config L2TP_V3
35 bool "L2TPv3 support (EXPERIMENTAL)"
36 depends on EXPERIMENTAL && L2TP
37 help
38 Layer Two Tunneling Protocol Version 3
39
40 From RFC 3931 <http://www.ietf.org/rfc/rfc3931.txt>.
41
42 The Layer Two Tunneling Protocol (L2TP) provides a dynamic
43 mechanism for tunneling Layer 2 (L2) "circuits" across a
44 packet-oriented data network (e.g., over IP). L2TP, as
45 originally defined in RFC 2661, is a standard method for
46 tunneling Point-to-Point Protocol (PPP) [RFC1661] sessions.
47 L2TP has since been adopted for tunneling a number of other
48 L2 protocols, including ATM, Frame Relay, HDLC and even raw
49 ethernet frames.
50
51 If you are connecting to L2TPv3 equipment, or you want to
52 tunnel raw ethernet frames using L2TP, say Y here. If
53 unsure, say N.
James Chapman0d767512010-04-02 06:19:00 +000054
55config L2TP_IP
56 tristate "L2TP IP encapsulation for L2TPv3"
57 depends on L2TP_V3
58 help
59 Support for L2TP-over-IP socket family.
60
61 The L2TPv3 protocol defines two possible encapsulations for
62 L2TP frames, namely UDP and plain IP (without UDP). This
63 driver provides a new L2TPIP socket family with which
64 userspace L2TPv3 daemons may create L2TP/IP tunnel sockets
65 when UDP encapsulation is not required. When L2TP is carried
66 in IP packets, it used IP protocol number 115, so this port
67 must be enabled in firewalls.
68
69 To compile this driver as a module, choose M here. The module
70 will be called l2tp_ip.