Draytek 2900 사용자 설명서

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Vigor2900 Series User’s Guide 
95
IKE 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. 
IPSec Security Method 
This group of fields is a must for IPSec Tunnels and L2TP with 
IPSec Policy when you specify the remote node. Check the 
Medium, DES, 3DES or AES box as the security method. 
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. 
Callback Function   
The callback function provides a callback service only for the 
ISDN dial-in user (for i model only). The router owner will be 
charged the connection fee by the telecom. 
Check to enable Callback function-Enables the callback 
function. 
Specify the callback number-The option is for extra security. 
Once enabled, the router will ONLY call back to the specified 
Callback Number. 
Check to enable callback budget control-By default, the 
callback function has a time restriction. Once the callback 
budget has been exhausted, the callback mechanism will be 
disabled automatically.   
Callback Budget (Unit: minutes)- Specify the time budget for 
the dial-in user. The budget will be decreased automatically per 
callback connection. 
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Here you can manage LAN-to-LAN connections by maintaining a table of connection profiles. 
You may set parameters including specified connection direction (dial-in or dial-out), 
connection peer ID, connection type (VPN including PPTP, IPSec Tunnel, and L2TP by itself 
or over IPSec) and corresponding security methods, etc. 
The router provides up to 32 profiles, which also means supporting 32 VPN tunnels 
simultaneously. The following figure shows the summary table.