VoIP/802.11g ADSL2+ VPN Firewall Router
Chapter 4: Configuration
DES:
Stands for Data Encryption Standard, it uses 56 bits as an encryption method.
3DES:
Stands for Triple Data Encryption Standard, it uses 168 (56*3) bits as an
encryption method.
AES:
Stands for Advanced Encryption Standards, you can use 128, 192 or 256 bits as
encryption method.
Diffie-Hellman Group:
It is a public-key cryptography protocol that allows two parties to establish
a shared secret over an unsecured communication channel (i.e. over the Internet). There are three
modes, MODP 768-bit, MODP 1024-bit and MODP 1536-bit. MODP stands for Modular
Exponentiation Groups.
Local ID:
Type:
Specify local ID type.
Content:
Input ID’s information, like domain name
www.ipsectest.com
.
Remote ID:
Type:
Specify Remote ID type.
Identifier:
Input remote ID’s information, like domain name
www.ipsectest.com
.
SA Lifetime:
Specify the number of minutes that a Security Association (SA) will stay active
before new encryption and authentication key will be exchanged. There are two kinds of SAs, IKE
and IPSec. IKE negotiates and establishes SA on behalf of IPSec, an IKE SA is used by IKE.
Phase 1 (IKE):
To issue an initial connection request for a new VPN tunnel. The range can be
from 5 to 15,000 minutes, and the default is 240 minutes.
Phase 2 (IPSec):
To negotiate and establish secure authentication. The range can be from 5 to
15,000 minutes, and the default is 60 minutes.
A short SA time increases security by forcing the two parties to update the keys. However, every
time the VPN tunnel re-negotiates, access through the tunnel will be temporarily disconnected.
PING for Keepalive:
It is used to detect IPSec tunnel connection failure. Connection failure is
defined as abort or in NO response state. In such event Ping to Keepalive takes proper action to
ensure the connection quality of IPSec.
PING to the IP:
It is able to IP Ping the remote PC with the specified IP address and alert when
the connection fails. Once alter message is received, Router will drop this tunnel connection. Re-
establish of this connection is required. Default setting is 0.0.0.0 which disables the function.
Internal:
This sets the time interval between
Pings to the IP
function to monitor the connection
status. Default interval setting is 10 seconds. Time interval can be set from 0 to 3600 second, 0
second disables the function.
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