Example for Configuring the Headquarters to Manage Branches (Cisco Routers) Using Efficient VPN and Establishing IPSec Tunnels - AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 CLI-based Typical Configuration Examples -
cisco - L2TP over IPSEC with a LAN to LAN link - Network Engineering Stack Exchange
L2TP/IPsecを使用した多拠点とのVPN接続 : コマンド設定
L2TP動作確認 | NW検証ブログ
Example for Establishing an L2TP over IPSec Tunnel for Employees on a Business Trip to Connect to the Headquarters - AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 CLI-based Typical
cisco - L2TP over IPSEC with a LAN to LAN link - Network Engineering Stack Exchange
Config L2TP/IPSec VPN server on cisco IOS│NAND GATE