1fd558d18SJames Chapman# 2fd558d18SJames Chapman# Layer Two Tunneling Protocol (L2TP) 3fd558d18SJames Chapman# 4fd558d18SJames Chapman 5fd558d18SJames Chapmanmenuconfig L2TP 6fd558d18SJames Chapman tristate "Layer Two Tunneling Protocol (L2TP)" 7fc181625SAmerigo Wang depends on (IPV6 || IPV6=n) 8fd558d18SJames Chapman depends on INET 9*85644b4dSTom Herbert select NET_UDP_TUNNEL 10fd558d18SJames Chapman ---help--- 11fd558d18SJames Chapman Layer Two Tunneling Protocol 12fd558d18SJames Chapman 13fd558d18SJames Chapman From RFC 2661 <http://www.ietf.org/rfc/rfc2661.txt>. 14fd558d18SJames Chapman 15fd558d18SJames Chapman L2TP facilitates the tunneling of packets across an 16fd558d18SJames Chapman intervening network in a way that is as transparent as 17fd558d18SJames Chapman possible to both end-users and applications. 18fd558d18SJames Chapman 19fd558d18SJames Chapman L2TP is often used to tunnel PPP traffic over IP 20fd558d18SJames Chapman tunnels. One IP tunnel may carry thousands of individual PPP 21fd558d18SJames Chapman connections. L2TP is also used as a VPN protocol, popular 22fd558d18SJames Chapman with home workers to connect to their offices. 23fd558d18SJames Chapman 24f7faffa3SJames Chapman L2TPv3 allows other protocols as well as PPP to be carried 25f7faffa3SJames Chapman over L2TP tunnels. L2TPv3 is defined in RFC 3931 26f7faffa3SJames Chapman <http://www.ietf.org/rfc/rfc3931.txt>. 27f7faffa3SJames Chapman 28fd558d18SJames Chapman The kernel component handles only L2TP data packets: a 29fd558d18SJames Chapman userland daemon handles L2TP the control protocol (tunnel 30fd558d18SJames Chapman and session setup). One such daemon is OpenL2TP 31fd558d18SJames Chapman (http://openl2tp.org/). 32fd558d18SJames Chapman 33fd558d18SJames Chapman If you don't need L2TP, say N. To compile all L2TP code as 34fd558d18SJames Chapman modules, choose M here. 35f7faffa3SJames Chapman 360ad66140SJames Chapmanconfig L2TP_DEBUGFS 370ad66140SJames Chapman tristate "L2TP debugfs support" 380ad66140SJames Chapman depends on L2TP && DEBUG_FS 390ad66140SJames Chapman help 400ad66140SJames Chapman Support for l2tp directory in debugfs filesystem. This may be 410ad66140SJames Chapman used to dump internal state of the l2tp drivers for problem 420ad66140SJames Chapman analysis. 430ad66140SJames Chapman 440ad66140SJames Chapman If unsure, say 'Y'. 450ad66140SJames Chapman 460ad66140SJames Chapman To compile this driver as a module, choose M here. The module 470ad66140SJames Chapman will be called l2tp_debugfs. 480ad66140SJames Chapman 49f7faffa3SJames Chapmanconfig L2TP_V3 5041694365SKees Cook bool "L2TPv3 support" 5141694365SKees Cook depends on L2TP 52f7faffa3SJames Chapman help 53f7faffa3SJames Chapman Layer Two Tunneling Protocol Version 3 54f7faffa3SJames Chapman 55f7faffa3SJames Chapman From RFC 3931 <http://www.ietf.org/rfc/rfc3931.txt>. 56f7faffa3SJames Chapman 57f7faffa3SJames Chapman The Layer Two Tunneling Protocol (L2TP) provides a dynamic 58f7faffa3SJames Chapman mechanism for tunneling Layer 2 (L2) "circuits" across a 59f7faffa3SJames Chapman packet-oriented data network (e.g., over IP). L2TP, as 60f7faffa3SJames Chapman originally defined in RFC 2661, is a standard method for 61f7faffa3SJames Chapman tunneling Point-to-Point Protocol (PPP) [RFC1661] sessions. 62f7faffa3SJames Chapman L2TP has since been adopted for tunneling a number of other 63f7faffa3SJames Chapman L2 protocols, including ATM, Frame Relay, HDLC and even raw 64f7faffa3SJames Chapman ethernet frames. 65f7faffa3SJames Chapman 66f7faffa3SJames Chapman If you are connecting to L2TPv3 equipment, or you want to 67f7faffa3SJames Chapman tunnel raw ethernet frames using L2TP, say Y here. If 68f7faffa3SJames Chapman unsure, say N. 690d76751fSJames Chapman 700d76751fSJames Chapmanconfig L2TP_IP 710d76751fSJames Chapman tristate "L2TP IP encapsulation for L2TPv3" 720d76751fSJames Chapman depends on L2TP_V3 730d76751fSJames Chapman help 740d76751fSJames Chapman Support for L2TP-over-IP socket family. 750d76751fSJames Chapman 760d76751fSJames Chapman The L2TPv3 protocol defines two possible encapsulations for 770d76751fSJames Chapman L2TP frames, namely UDP and plain IP (without UDP). This 780d76751fSJames Chapman driver provides a new L2TPIP socket family with which 790d76751fSJames Chapman userspace L2TPv3 daemons may create L2TP/IP tunnel sockets 800d76751fSJames Chapman when UDP encapsulation is not required. When L2TP is carried 810d76751fSJames Chapman in IP packets, it used IP protocol number 115, so this port 820d76751fSJames Chapman must be enabled in firewalls. 830d76751fSJames Chapman 840d76751fSJames Chapman To compile this driver as a module, choose M here. The module 850d76751fSJames Chapman will be called l2tp_ip. 86d9e31d17SJames Chapman 87d9e31d17SJames Chapmanconfig L2TP_ETH 88d9e31d17SJames Chapman tristate "L2TP ethernet pseudowire support for L2TPv3" 89d9e31d17SJames Chapman depends on L2TP_V3 90d9e31d17SJames Chapman help 91d9e31d17SJames Chapman Support for carrying raw ethernet frames over L2TPv3. 92d9e31d17SJames Chapman 93d9e31d17SJames Chapman From RFC 4719 <http://www.ietf.org/rfc/rfc4719.txt>. 94d9e31d17SJames Chapman 95d9e31d17SJames Chapman The Layer 2 Tunneling Protocol, Version 3 (L2TPv3) can be 96d9e31d17SJames Chapman used as a control protocol and for data encapsulation to set 97d9e31d17SJames Chapman up Pseudowires for transporting layer 2 Packet Data Units 98d9e31d17SJames Chapman across an IP network [RFC3931]. 99d9e31d17SJames Chapman 100d9e31d17SJames Chapman This driver provides an ethernet virtual interface for each 101d9e31d17SJames Chapman L2TP ethernet pseudowire instance. Standard Linux tools may 102d9e31d17SJames Chapman be used to assign an IP address to the local virtual 103d9e31d17SJames Chapman interface, or add the interface to a bridge. 104d9e31d17SJames Chapman 105d9e31d17SJames Chapman If you are using L2TPv3, you will almost certainly want to 106d9e31d17SJames Chapman enable this option. 107d9e31d17SJames Chapman 108d9e31d17SJames Chapman To compile this driver as a module, choose M here. The module 109d9e31d17SJames Chapman will be called l2tp_eth. 110