PPTP supports one tunnel between two endpoints.Ĭompressed L2TP headers are 4 bytes, and compressed PPTP headers are 6 bytes. L2TP also supports several tunnels between two endpoints, each having its own quality of service. There are several differences between L2TP and PPTP.įor example, L2TP can use a variety of tunnel media, whereas PPTP can only tunnel over IP networks. These include transmission failure due to mismatched security keys, limited port support and slower speeds. An additional way to authenticate the endpoints of a tunnel is to use L2TP to provide extra security implemented with IP Security ( IPsec). This includes Password Authentication Protocol, Microsoft Challenge-Handshake Authentication Protocol and CHAP. L2TP also supports various authentication options carried by PPP. Additional benefits are reliability, stability, compatibility, configurability and protection from man-in-the-middle attacks. If the circuit concentrator is local, long-distance charges are eliminated. As a result, packets can be processed separately from the location of the circuit termination. The user has an L2 connection to a LAC, which tunnels individual PPP frames to the NAS. L2TP uses packet-switched network connections to enable endpoints to reside in different machines. In this configuration, the L2 and PPP session endpoints are both on the same NAS. In this scenario, the user connects to the network access server ( NAS) through ISDN, Asymmetric Digital Subscriber Line, Plain Old Telephone Service or other services, and PPP runs over that connection. PPP defines a means of encapsulation to transmit multiprotocol packets over L2 point-to-point links. However, this limitation no longer exists. Early versions were limited to carrying PPP. Layer Two Tunneling Protocol enables ISPs to use virtual private networks.
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