Difference between revisions of "OpenVPN on 4.0.2CD"


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(refactored Setup 2: tunnel with static-key security)
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On first machine 192.168.0.200:
 
On first machine 192.168.0.200:
 
  sudo openvpn --remote 192.168.0.201 --dev tun \
 
  sudo openvpn --remote 192.168.0.201 --dev tun \
   --ifconfig 10.4.0.1 10.4.0.2 --verb 9 >& vpn.log &
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   --ifconfig 10.4.0.1 10.4.0.2 --verb 9 >
On second machine 192.168.0.201:
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sudo openvpn --remote 192.168.0.200 --dev tun \
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  --ifconfig 10.4.0.2 10.4.0.1 --verb 9 >& vpn.log &
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Test with a ping from first machine to second:
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ping -R -c 4 10.4.0.2
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Test with a ping from second machine to first:
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ping -R -c 4 10.4.0.1
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== Setup 2: tunnel with static-key security ==
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The first machine (192.168.0.200) will act as the server.  The second machine (192.168.0.201) will act as the client.
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Setup environment variables on both client and server:
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public_server=192.168.0.200
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public_client=192.168.0.201
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open_vpn_server=10.1.1.200
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open_vpn_client=10.1.1.201
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On the server, generate a key:
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openvpn --genkey --secret openvpn.key
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Copy key to the client, e.g. using a USB stick or via ssh:
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scp openvpn.key knoppix@${public_client}:
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On the server, start openvpn:
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sudo openvpn --dev tun --ifconfig ${open_vpn_server} ${open_vpn_client} \
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  --secret openvpn.key --verb 9 >&vpn.log &
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On the client, connect to openvpn daemon on server:
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sudo openvpn --dev tun --ifconfig ${open_vpn_client} ${open_vpn_server} \
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  --remote ${public_server} \
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  --secret openvpn.key --verb 9 >&vpn.log &
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On the client, ping the server:
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ping -R -c 4 ${open_vpn_server}
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On the server, ping the client:
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ping -R -c 4 ${open_vpn_client}
+

Revision as of 11:51, 22 June 2007

The goal is to create a simple VPN between two machines on a network. The VPN software will be OpenVPN under Knoppix 4.0.2CD using a persistent disk image (PDI).


Setup

Create and boot with a 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 >