Draytek Vigor2830 Series User Manual page 271

GRE over IPSec
Settings
on the L2TP connection.
Specify Remote VPN Gateway - You can specify the IP
address of the remote dial-in user or peer ID (should be the
same with the ID setting in dial-in type) by checking the box.
Also, you should further specify the corresponding security
methods on the right side. If you uncheck the checkbox, the
connection type you select above will apply the authentication
methods and security methods in the general settings.
User Name - This field is applicable when you select PPTP or
L2TP with or without IPSec policy above. The maximum
length for both username is 11 characters.
Password - This field is applicable when you select PPTP or
L2TP with or without IPSec policy above. The maximum
length for both username is 11 characters.
VJ Compression - VJ Compression is used for TCP/IP
protocol header compression. This field is applicable when you
select PPTP or L2TP with or without IPSec policy above.
IKE Authentication Method - This group of fields is
applicable for IPSec Tunnels and L2TP with IPSec Policy
when you specify the IP address of the remote node. The only
exception is Digital Signature (X.509) can be set when you
select IPSec tunnel either with or without specify the IP
address of the remote node.
Pre-Shared Key - Check the box of Pre-Shared Key to invoke
this function and type in the required characters (1-63) as the
pre-shared key. Digital Signature (X.509) –Check the box of
Digital Signature to invoke this function and select one
predefined Profiles set in the VPN and Remote Access
>>IPSec Peer Identity.
Local ID – Specify which one will be inspected first.

Alternative Subject Name First – The alternative
subject name (configured in Certificate
Management>>Local Certificate) will be inspected
first.

Subject Name First – The subject name (configured in
Certificate Management>>Local Certificate) will be
inspected first.
IPSec Security Method - This group of fields is a must for
IPSec Tunnels and L2TP with IPSec Policy when you specify
the remote node.

Medium- Authentication Header (AH) means data will
be authenticated, but not be encrypted. By default, this
option is active.

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.
Enable IPSec Dial-Out function GRE over IPSec: Check
this box to verify data and transmit data in encryption with
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Vigor2830 Series User's Guide