ADSL2+ (802.11g) (VPN) Firewall Router
Chapter 4: Configuration
69
or else manually specify CHAP (Challenge Handshake Authentication Protocol) or PAP (Password
Authentication Protocol) if you know which type the server is using (when acting as a client), or else the
authentication type you want clients connecting to you to use (when acting as a server). When using PAP,
the password is sent unencrypted, whilst CHAP encrypts the password before sending, and also allows
for challenges at different periods to ensure that an intruder has not replaced the client.
Data Encryption:
Data sent over the VPN connection can be encrypted by an MPPE algorithm. Default
is
Auto,
so that this setting is negotiated when establishing a connection, or else you can manually
Enable
or
Disable
encryption.
Key Length:
The data can be encrypted by MPPE algorithm with 40 bits or 128 bits. Default is
Auto
, it is
negotiated when establishing a connection. 128 bit keys provide stronger encryption than 40 bit keys.
Mode:
You may select
Stateful
or
Stateless
mode. The key will be changed every 256 packets when you
select Stateful mode. If you select Stateless mode, the key will be changed in each packet.
Active as default route
: Commonly used by the
Dial-out
connection which all packets will route through
the VPN tunnel to the Internet; therefore, active the function may degrade the Internet performance.
Active:
This function activates or deactivates the PPTP connection. Check Active checkbox if you want
the protocol of tunnel to be activated and vice versa.
Note:
When the Active checkbox is checked, the function of Edit and Delete will not be available.
Click
Edit/Delete
button to save your changes.
