Draytek Vigor2926L User Manual page 365

Item Description
Medium-Authentication Header (AH) means data will be
authenticated, but not be encrypted. By default, this option is
invoked. You can uncheck it to disable it.
High-Encapsulating Security Payload (ESP) means payload
(data) will be encrypted and authenticated. You may select
encryption algorithm from Data Encryption Standard (DES),
Triple DES (3DES), and AES.
Local ID - Specify a local ID to be used for Dial-in setting in the
LAN-to-LAN Profile setup. This item is optional and can be
used only in IKE aggressive mode.
After finishing all the settings here, please click OK to save the configuration.
Vigor2926 Series User's Guide 349