In computer networking, Layer 2 Tunneling Protocol (L2TP) is a tunneling protocol used to support virtual private networks (VPNs) or as part of the delivery of services by ISPs. It uses encryption ('hiding') only for its own control messages (using an optional pre-shared secret), and does not provide any encryption or confidentiality of content by itself. Rather, it provides a tunnel for Layer 2 (which may be encrypted), and the tunnel itself may be passed over a Layer 3 encryption protocol such as IPsec.[1]
Internet protocol suite
Application layer
BGP
DHCP (v6)
DNS
FTP
HTTP (HTTP/3)
HTTPS
IMAP
IRC
LDAP
MGCP
MQTT
NNTP
NTP
OSPF
POP
PTP
ONC/RPC
RTP
RTSP
RIP
SIP
SMTP
SNMP
SSH
Telnet
TLS/SSL
XMPP
more...
Transport layer
TCP
UDP
DCCP
SCTP
RSVP
QUIC
more...
Internet layer
IP
v4
v6
ICMP (v6)
NDP
ECN
IGMP
IPsec
more...
Link layer
ARP
Tunnels
PPP
MAC
more...
v
t
e
^IETF (1999), RFC 2661, Layer Two Tunneling Protocol "L2TP"
and 25 Related for: Layer 2 Tunneling Protocol information
L2F, or Layer2 Forwarding, is a tunnelingprotocol developed by Cisco Systems, Inc. to establish virtual private network connections over the Internet...
Transport Layer Security (TLS) is a cryptographic protocol designed to provide communications security over a computer network. The protocol is widely...
Datagram Transport Layer Security (DTLS) is a communications protocol providing security to datagram-based applications by allowing them to communicate...
The Link Layer Discovery Protocol (LLDP) is a vendor-neutral link layerprotocol used by network devices for advertising their identity, capabilities...
Secure Socket TunnelingProtocol (SSTP) is a form of virtual private network (VPN) tunnel that provides a mechanism to transport PPP traffic through an...
The data link layer, or layer2, is the second layer of the seven-layer OSI model of computer networking. This layer is the protocollayer that transfers...
networking, the link layer is the lowest layer in the Internet protocol suite, the networking architecture of the Internet. The link layer is the group of...
tunnellingprotocol on one port. Versions 1 and 2 are each effectively two protocols, one for control (called GTP-C) and one for user data tunneling (called...
Encapsulation (GRE) is a tunnelingprotocol developed by Cisco Systems that can encapsulate a wide variety of network layerprotocols inside virtual point-to-point...
for tunneling, forwarding of TCP ports and X11 connections and it can be used to transfer files using the associated SSH File Transfer Protocol (SFTP)...
The Internet Protocol (IP) is the network layer communications protocol in the Internet protocol suite for relaying datagrams across network boundaries...
the communication protocol is encrypted using Transport Layer Security (TLS) or, formerly, Secure Sockets Layer (SSL). The protocol is therefore also...
April 24, 2021. IETF L2TPEXT working group RFC 3931 - Layer Two TunnelingProtocol - Version 3 (L2TPv3) RFC 2661 - Layer Two TunnelingProtocol "L2TP"...
layers for a particular application forms a protocol stack. From lowest to highest, the layers are the link layer, containing communication methods for data...
IP tunneling or remote procedure call and the Network File System. It is simple, suitable for bootstrapping or other purposes without a full protocol stack...
The internet layer is a group of internetworking methods, protocols, and specifications in the Internet protocol suite that are used to transport network...
Multiprotocol Label Switching (MPLS), Internet Protocol (IPv4 or IPv6), or Layer2TunnelingProtocol Version 3 (L2TPv3). The first pseudowire specifications...
preventing tuberculosis L2TP Access Concentrator, endpoint of a Layer2TunnelingProtocoltunnel Laboratoire Aimé-Cotton, French research laboratory Linear...
Protocol (ARP) is a communication protocol used for discovering the link layer address, such as a MAC address, associated with a given internet layer...
Global Information