Novell LINUX ENTERPRISE DESKTOP 11, Manual

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The userspace program OpenVPN can attach itself to a tun or tap device to receive
packets sent by your OS. The program is also able to write packets to the device. Read
more details in
/usr/src/linux/Documentation/networking/tuntap
.txt
.
16.2 Creating the Simplest VPN
Example
The following example creates a point-to-point VPN tunnel. It demonstrates how to
create a VPN tunnel between one client and a server. It is assumed that your VPN
server will use the IP address
10.23.8.1
and your client the IP address
10.23.8.2
.
You can modify these private IP adresses to your needs but make sure you select
adresses which are not used to minimize problems with IP address or subnet conflicts.
WARNING: Use It Only For Testing
This scenario is only useful for testing and is considered as an example to get
used to VPN. Do not use this as a real world scenario to connect as it can
compromise your security and the safety of your IT infrastructure!
16.2.1 Configuring the VPN Server
To configure a VPN server, do the following:
1
Install the package
openvpn
on the machine that will later become your VPN
server.
2
Open a shell, become
root
and create the VPN secret key:
openvpn --genkey --secret /etc/openvpn/secret.key
3
Copy the secret key to your client:
scp /etc/openvpn/secret.key root@10.23.8.2:/etc/openvpn/
Configuring VPN Server 185