IPCOP VPN in Ubuntu 8.04

On IPCOP machine side (server)

Under the VPNs tab, enable the VPN on BLUE checkbox. Click Save.

Create your host/root certificates by clicking on the Generate Root/Host certificates button. After creation, there are two lines. First line is Root certificate. The subject line should be something like: C=US, O=My Network, CN=My Network CA. You'll need this info later.

Add a new connection (on the same page). Select host-to-net (road warrior) connection. Give it a name like BlueNetwork. Interface (obviously) should be blue. Local subnet should be 0.0.0.0/0.0.0.0 (this will give you access to the green and red networks). For authentication, I am using a pre-shared key, so I make sure that that line has the selected radio buttona and Fill in password. Click Save.

On Ubuntu machine side (client)

Install OpenSwan
$ sudo apt-get install openswan (to get Openswan installed)

Edit file /etc/ipsec.conf and paste the below script after "# Add connections here"
++++++++++++++

conn bluenetwork
 left=%defaultroute 
 right=x.y.z.w
 rightsubnet=192.168.1.0/255.255.255.0
 authby=secret
 auth=esp
 pfs=yes
 compress=no
 auto=add

Note (1): replace x.y.z.w with the public IP of the IPCop VPN you
want to access
Note (2): change rightsubnet as per the internal network (GREEN)
behind the IPCop firewall
Note (3): you can change "bluenetwork" to another name if you want to

In your /etc/ipsec.secrets you just need:
=========================================
: PSK "pre-shared key defined in the IPCop VPN"

To start IPsec:
# /etc/init.d/ipsec start

To stop IPsec:
# /etc/init.d/ipsec stop

To bring up the VPN tunnel:
# ipsec auto --up myvpn

To bring down the VPN tunnel:
# ipsec auto --down myvpn


Hopely success full :)
Thank to "whitelover"