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Page 71 / 110 Scroll up to view Page 66 - 70
TW-EA510 version 4 ADSL2+, WLAN 802.11g, VPN, Firewall Router
Chapter 4: Configuration
70
VPN (Virtual Private Networks)
Virtual Private Networks is ways to establish secured communication tunnels to an organization’s
network via the Internet. Your router supports three main types of VPN (Virtual Private Network),
PPTP
PPTP (Point-to-Point Tunneling Protocol)
There are two types of PPTP VPN supported;
Remote Access
and
LAN-to-LAN
(please refer below for
more information.). Click
Create
to configure a new VPN connection.
After you have created PPTP connection, account status will be displayed. (See example above).
±
Enable / Disable:
This function activates or deactivates the PPTP connection.
To wish
interrupting the tunnel, check
Disable
radio button and click
Apply
button to deactivate the
connection.
Name:
This is the user-defined name of the connection.
Type:
This refers to your router operates as a client or a server,
Dialout
or
Dialin
in respectively.
Status:
It informs your PPTP tunnel connection condition.
Page 72 / 110
TW-EA510 version 4 ADSL2+, WLAN 802.11g, VPN, Firewall Router
Chapter 4: Configuration
71
PPTP Connection - Remote Access
Connection Name:
A user-defined name for the connection (e.g. “connection to office”).
Type:
Check
Dial Out
if you want your router to operate as a client (connecting to a remote VPN server,
e.g. your office server), check
Dial In
operates as a VPN server.
±
When configuring your router as a Client, enter the remote
Server IP
Address
(or Domain
Name)
you wish to connection to.
±
When configuring your router as a server, enter the
Private IP Address Assigned to Dial in
User
address.
Username:
If you are a Dial-Out user (client), enter the username provided by your Host.
If you are a
Dial-In user (server), enter your own username.
Password:
If you are a Dial-Out user (client), enter the password provided by your Host.
If you are a
Dial-In user (server), enter your own password.
PPP Authentication Type:
Default is
Auto
if you want the router to determine the authentication type to
use, 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.
Idle Time
: Auto-disconnect the VPN connection when there is no activity on the connection for a
predetermined period of time. 0 means this connection is always on.
Page 73 / 110
TW-EA510 version 4 ADSL2+, WLAN 802.11g, VPN, Firewall Router
Chapter 4: Configuration
72
Active as default route
: Enables the default route.
Click
Apply
button to apply your changes.
Example: Configuring a Remote Access PPTP VPN Dial-out Connection
A company’s office establishes a PPTP VPN connection with a file server located at a separate location.
The router is installed in the office, connected to a couple of PCs and Servers.
Dial-out
Page 74 / 110
TW-EA510 version 4 ADSL2+, WLAN 802.11g, VPN, Firewall Router
Chapter 4: Configuration
73
Configuring the PPTP VPN in the Office
You can either input the IP address (69.1.121.33 in this case) or hostname to reach the server.
Item
Function
Description
1
Connection Name
VPN_PPTP
Given name of PPTP connection
Dial out
Check Dial out
2
Server IP Address
(or Domain name)
69.121.1.33
An Dialed server IP
Username
username
3
Password
123456
A given username & password
Auth.Type
Chap(Auto)
Data Encryption
Auto
Key Length
Auto
4
Mode
stateful
Keep as default value in most of the cases,
PPTP server & client will determine the value
automatically.
Refer to manual for details if you
want to change the setting.
5
Idle Time
0
The connection will be disconnected when there
Is no traffic in a predefined period of time.
Idle
time
0
means the connection is always on.
1
4
3
2
5
Page 75 / 110
TW-EA510 version 4 ADSL2+, WLAN 802.11g, VPN, Firewall Router
Chapter 4: Configuration
74
PPTP Connection - LAN to LAN
Connection Name:
A user-define description of the connection.
Type:
Check
Dial Out
if you want your router to operate as a client (connecting to a remote VPN server,
e.g. your office server), check
Dial In
operates as a VPN server.
±
When configuring your router as a Client, enter the remote
Server IP
Address
(or Hostname)
you wish to connection to.
±
When configuring your router as a server, enter the
Private IP Address Assigned to Dial in
User
address.
Peer Network IP:
Enter Peer network IP address.
Netmask:
Enter the subnet mask of peer network based on the Peer Network IP setting.
Username:
If you are a Dial-Out user (client), enter the username provided by your Host.
If you are a
Dial-In user (server), enter your own username.
Password:
If you are a Dial-Out user (client), enter the password provided by the your Host. If you are a
Dial-In user (server), enter your own password.
PPP Authentication Type:
Default is
Auto
if you want the router to determine the authentication type to
use, 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 the client has not been replaced by an intruder.
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.

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