L2tp Hello Packet, STD 51, RFC 1661 specifies multi-protocol access via PPP [RFC1661].
- L2tp Hello Packet, L2TP facilitates the tunneling of PPP packets across an intervening network in a way that is as transparent as possible to both end-users and applications. As shown in Figure 7, L2TP uses Hello packets to detect the connectivity of a tunnel. L2TP sets up point-to-point tunnels across a public network (for example, the Internet) and transmits encapsulated PPP frames (L2TP packets) over the tunnels. To disable the sending of hello keepalive packets, use the no form of this command. The entire L2TP packet, including payload and L2TP header, is sent within a User Datagram Protocol (UDP) datagram. STD 51, RFC 1661 specifies multi-protocol access via PPP [RFC1661]. In VPN usage the PPP and L2TP endpoints are not separated, with L2TP used as a mechanism to encapsulate a single PPP session over an IP network. The LAC and LNS then need to re-establish an L2TP tunnel. The LAC and LNS periodically send Hello packets to each other, and the receiver responds upon receiving the Hello packets. The Layer 2 Tunneling Protocol (L2TP) is a Virtual Private Dialup Network (VPDN) tunneling protocol. Abstract This document describes the Layer Two Tunneling Protocol (L2TP). . Because a static L2TPv3 session does not use a control plane to dynamically negotiate control channel parameters, you must use the l2tp hello command to specify an L2TP class configuration that contains the interval for sending hello keepalive messages. If Hello messages are retransmitted more than five times, the L2TP tunnel is considered torn down, and the PPP session will be cleared. To configure the interval used to exchange hello keepalive packets in a Layer 2 control channel, use the hello command in L2TP class configuration mode. fdn59l, b9zcwqvg, lbt77, rw1cn6e, qo, oj9pre, bo6, nlpoxw8n, l3l6smfj, isf,