如何设置l2tp lns侧的源IP？

如何设置l2tp lns侧的源IP？ 找了个官方配置文档，并没有介绍，但是在网络上确有人说时可以在l2tp-group下配置tunnel source,但是我没找到这个命令，还有介绍全局配置l2tp source 的，我也没找到！因为与远端的LAC是多条路径，通过三层路由互通，就想象成互联网吧，我的目的是想在LNS用loopback地址与LAC进行建立连接，看下面的搜索

[H3C]  l2tp ?

  enable            Enable L2TP

  icrq-limit        Limit the ICRQ packets

  tsa-id            Specify an ID for the Tunnel Switching Aggregator

  user-ip-conflict  IP address conflict

  virtual-template  Specify a VT interface

[H3C]l2tp-gr

[H3C]l2tp-group 1

[H3C-l2tp1]?

L2tpv2-group view commands:

  allow               Accept the tunneling requestings from an LAC

  cfd                 Connectivity Fault Detection (CFD) module

  diagnostic-logfile  Diagnostic log file configuration

  dialer              Specify Dial-on-Demand Routing(DDR) configuration 

                      information

  display             Display current system information

  end                 Alias for 'return'

  exit                Alias for 'quit'

  ip                  Configure IP parameters for tunnel packets

  lig                 LISP Internet Groper operation

  loadbalance         Load Balancing module

  lock                Lock the current line

  logfile             Log file configuration

  loopback-test       Configure loopback test settings

  mandatory-chap      Force the LNS to perform a CHAP authentication of the L2TP

                      client 

  mandatory-lcp       Force the LNS to perform LCP negotiation with an L2TP 

                      client 

  monitor             System monitor

  no                  Alias for 'undo'

  oam                 Configure OAM parameters

  ping                Ping function

  quit                Exit from current command view

  repeat              Repeat executing history commands

  reset               Reset current configuration

  return              Exit to User View

  save                Save current configuration

  security-logfile    Security log file configuration

  show                Alias for 'display'

  smartmc             SmartMC module

  trace-logfile       Trace log file configuration

  tracert             Tracert function

  tunnel              Configure L2TP tunnel parameters

  undo                Cancel current setting

  vpn-instance        Specify the VPN instance that the L2TP tunnel belongs to

  wlan                WLAN configuration

  write               Alias for 'save'

[H3C-l2tp1] 

[H3C-l2tp1]tunnel  ?

  authentication  Enable authentication for the L2TP tunnels

  avp-hidden      Transfer attribute value pair (AVP) data in hidden mode

  flow-control    Enable flow control for the L2TP tunnels

  name            Configure the local name for the L2TP tunnels

  password        Specify a password for the L2TP tunnels

  retransmit      Specify L2TP control packet retransmission times

  timeout         Specify the timeout period L2TP control packet retransmission

  timer           Set a timer

  window          Set window

[H3C]disp version

H3C Comware Software, Version 7.1.064, Release 6749P33

Copyright (c) 2004-2024 New H3C Technologies Co., Ltd. All rights reserved.

H3C MSR2600 uptime is 0 weeks, 0 days, 19 hours, 45 minutes

Last reboot reason : Power on

Boot image: flash:/msr26x1a-cmw710-boot-r6749p33.bin

Boot image version: 7.1.064P80, Release 6749P33

  Compiled Dec 13 2024 15:00:00

System image: flash:/msr26x1a-cmw710-system-r6749p33.bin

System image version: 7.1.064, Release 6749P33

  Compiled Dec 13 2024 15:00:00

Feature image(s) list:

  flash:/msr26x1a-cmw710-security-r6749p33.bin, version: 7.1.064

    Compiled Dec 13 2024 15:00:00

  flash:/msr26x1a-cmw710-voice-r6749p33.bin, version: 7.1.064

    Compiled Dec 13 2024 15:00:00

  flash:/msr26x1a-cmw710-data-r6749p33.bin, version: 7.1.064

    Compiled Dec 13 2024 15:00:00