Draytek VigorPro 5510 Series User Manual page 176

Callback Function
GRE over IPSec Settings
My WAN IP
Remote Gateway IP
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.
The callback function provides a callback service only for
the ISDN LAN-to-LAN connection (this feature is useful for
i model only). The remote user will be charged the
connection fee by the telecom.
Enable Callback function-Enables the callback function.
Use the Following Number to Callback – Check this box to
use the number typed below for callback.
Callback Number -The option is for extra security. Once
enabled, the router will ONLY call back to the specified
Callback Number.
Callback Budget (Unit: minutes)- By default, the callback
function has limitation of callback period. Once the callback
budget is exhausted, the function will be disabled
automatically. Specify the time budget for the dial-in user.
The budget will be decreased automatically per callback
connection. The default value 0 means no limitation of
callback period.
Enable IPSec Dial-Out function GRE over IPSec: Check
this box to verify data and transmit data in encryption with
GRE over IPSec packet after configuring IPSec Dial-Out
setting. Both ends must match for each other by setting same
virtual IP address for communication.
Logical Traffic: Such technique comes from RFC2890.
Define logical traffic for data transmission between both
sides of VPN tunnel by using the characteristic of GRE.
Even hacker can decipher IPSec encryption, he/she still
cannot ask LAN site to do data transmission with any
information. Such function can ensure the data transmitted
on VPN tunnel is really sent out from both sides. This is an
optional function. However, if one side wants to use it, the
peer must enable it, too.
My GRE IP: Type the virtual IP for router itself for verified
by peer.
Peer GRE IP: Type the virtual IP of peer host for verified
by router.
This field is only applicable when you select ISDN, PPTP or
L2TP with or without IPSec policy above. The default value
is 0.0.0.0, which means the Vigor router will get a PPP IP
address from the remote router during the IPCP negotiation
phase. If the PPP IP address is fixed by remote side, specify
the fixed IP address here. Do not change the default value if
you do not select ISDN, PPTP or L2TP.
This field is only applicable when you select ISDN, PPTP or
L2TP with or without IPSec policy above. The default value
is 0.0.0.0, which means the Vigor router will get a remote
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VigorPro5510 Series User's Guide