OpenVPN on 4.0.2CD

2008-07-12T08:32:03Z

193.67.39.194: dompasac

eltace
The goal is to create a simple VPN between two machines on a network. The VPN software will be [http://openvpn.net/ OpenVPN] under Knoppix 4.0.2CD using a persistent disk image (PDI).
__TOC__

= Setup =
Create and boot with a [http://www.knoppix.net/wiki/Customizing_environment_using_4.0.2CD#Persistent_Disk_Image_.28PDI.29 persistent disk image]. 500 MB should be plenty big.

= Installing =
Following notes from http://openvpn.net/howto.html#install
apt-get update
ls -la /dev/net/tun
apt-get -y install openvpn carpaltunnel
# Answer "yes" when the installer asks about creating the tun device.
# Answer "no" when asked about stopping VPN service (there is none)
ls -la /dev/net/tun

= Configuring =
Following example from http://openvpn.net/man.html#lbAV
lsmod| grep tun
modprobe tun
lsmod| grep tun

= Run and test with two machines =
This is on two machines connected to a router with a DHCP server that serves up IP addresses in the 192.168.0.xxx range.

== Setup 1: simple tunnel without security ==
On first machine 192.168.0.200:
sudo openvpn --remote 192.168.0.201 --dev tun \
--ifconfig 10.4.0.1 10.4.0.2 --verb 9 >& vpn.log &
On second machine 192.168.0.201:
sudo openvpn --remote 192.168.0.200 --dev tun \
--ifconfig 10.4.0.2 10.4.0.1 --verb 9 >& vpn.log &
Test with a ping from first machine to second:
ping -R -c 4 10.4.0.2
Test with a ping from second machine to first:
ping -R -c 4 10.4.0.1

== Setup 2: tunnel with static-key security ==
The first machine (192.168.0.200) will act as the server. The second machine (192.168.0.201) will act as the client.

Setup environment variables on both client and server:
public_server=192.168.0.200
public_client=192.168.0.201
open_vpn_server=10.1.1.200
open_vpn_client=10.1.1.201

On the server, generate a key:
openvpn --genkey --secret openvpn.key

Copy key to the client, e.g. using a USB stick or via ssh:
scp openvpn.key knoppix@${public_client}:

On the server, start openvpn:
sudo openvpn --dev tun --ifconfig ${open_vpn_server} ${open_vpn_client} \
--secret openvpn.key --verb 9 >&vpn.log &

On the client, connect to openvpn daemon on server:
sudo openvpn --dev tun --ifconfig ${open_vpn_client} ${open_vpn_server} \
--remote ${public_server} \
--secret openvpn.key --verb 9 >&vpn.log &

On the client, ping the server:
ping -R -c 4 ${open_vpn_server}

On the server, ping the client:
ping -R -c 4 ${open_vpn_client}

Knoppix Documentation Wiki - User contributions [en]

OpenVPN on 4.0.2CD