Huawei AR1200 Series Configuration Guide

<Huawei> display l2tp-group 1
-----------------------------------------------
L2tp-index : 1
GroupType : ACCEPT_DIALIN_L2TP
TunnelAuth : Use tunnel authentication
LocalName : lns
Encrypt : 0
Hello : 60
Retransmit : 5
Timeout : 2
IfIndex : 4294967295
SrcIp : 255.255.255.255
VtNum : 1
RemoteName : lac1
ForceChap : 0
LcpReg : 0
LcpMismatch : 0
tunnel each user : 0
-----------------------------------------------
4.5 Adjusting L2TP Connection
After an L2TP tunnel is set up, you can configure or adjust L2TP parameters.
4.5.1 Establishing the Configuration Task
Before adjusting an L2TP tunnel, familiarize yourself with the applicable environment, complete
the pre-configuration tasks, and obtain the required data. This can help you complete the
configuration task quickly and accurately.
Applicable Environment
This section describes the common L2TP configurations, which can be applied for either the
LAC or the LNS.
l Tunnel authentication: Either an LAC or an LNS can send tunnel authentication requests.
An L2TP tunnel can be established only if both the LAC and the LNS are enabled with the
tunnel authentication, and have the same password (not null). Otherwise, the local end
disconnects the tunnel automatically. If the tunnel authentications are disabled on both ends,
the L2TP tunnel still cannot be established even if the passwords on two ends are the same.
l Attribute Value Pair (AVP) hidden transmission: AVP is adopted in the L2TP protocol to
transmit and negotiate some parameter attributes of L2TP. For the sake of security, users
transmit these AVPs in hidden mode.
l Hello packets sending: To check the connectivity of a tunnel, the LAC and the LNS send
Hello packets to each other periodically, and the receiver responds the peer within a
specified interval. If no response is received from the peer within the specified interval, the
local end resends the Hello packets. After the Hello packets are resent for more than three
times, the L2TP tunnel is regarded as disconnected. The tunnel connection needs to be re-
established between the LAC and the LNS.
NOTE
All the configurations described in this section are optional. You can take the default settings in most cases.
Pre-configuration Tasks
None
Huawei AR1200 Series Enterprise Routers
Configuration Guide - VPN 4 L2TP Configuration
Issue 01 (2012-04-20) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
263

Huawei AR1200 Series Specifications

General

Brand	Huawei
Model	AR1200 Series
Category	Network Router
Language	English