Problem Setting Up Vpn Bridge

[MAbdullah47]

Hi Experts :

I have Some Difficulties On Setting Up My Openvpn on (ubuntu 8.04) Based from the following Links:
http://openvpn.net/index.php/documentation/miscellaneous/ethernet-bridging.html
http://www.linode.com/wiki/index.php/OpenVPN

The OpenVPN bridge can now be started and stopped using this Ideal sequence::

• run bridge-start
• run openvpn
• stop openvpn
• run bridge-stop
  The Setting of the Client/Server illustrated on the (Attached File) each Machine Has (2) NW Cards
  (eth0,eth1)
  The Bridge-Start Script on the (Server) :
  Bridge script:
  #!/bin/bash
  #################################

Set up Ethernet bridge on Linux

Requires: bridge-utils

#################################

Define Bridge Interface

br="br0"

Define list of TAP interfaces to be bridged,

for example tap="tap0 tap1 tap2".

tap="tap0"

Define physical ethernet interface to be bridged

with TAP interface(s) above.

eth="eth0"
#get this info with: ifconfig
eth_ip="192.168.3.1"
eth_netmask="255.255.225.0"
eth_broadcast="192.168.3.255"
#gateway, get it with: netstat -rN
gw="192.168.3.1"

The Bridge-Start Script on the (Client) :
Bridge script:
#!/bin/bash
#################################

Set up Ethernet bridge on Linux

Requires: bridge-utils

#################################

Define Bridge Interface

br="br0"

Define list of TAP interfaces to be bridged,

for example tap="tap0 tap1 tap2".

tap="tap0"

Define physical ethernet interface to be bridged

with TAP interface(s) above.

eth="eth0"
#get this info with: ifconfig
eth_ip="192.168.3.172"
eth_netmask="255.255.225.0"
eth_broadcast="192.168.3.255"
#gateway, get it with: netstat -rN
gw="192.168.3.172"

About Server & Client (..conf) same as on the link:
http://openvpn.net/index.php/documentation/miscellaneous/ethernet-bridging.html
the bridge on server:
server-bridge 192.168.1.72 255.255.255.0 192.168.1.1 192.168.1.200

The Client Remote:
remote 192.168.3.1 1194

I made manual Ip Routing for IPs:
IPs <127 to come from (192.168.3.1) her is the command:
route add -net 192.168.1.0 netmask 255.255.255.128 gw 192.168.3.1
IPs >127 to come from (192.168.3.1) her is the command:
route add -net 192.168.1.128 netmask 255.255.255.128 gw 192.168.3.172

Manual Routing Ping between the two Machines successfully pinging (without operating openvpn) , but
any client connected to any of the two machines will not ping successfully.

But when I Run the (openvpn server.conf) & (openvpn client.conf) I got the following error messages:
The Client Site:
Cannot ioctl TUNSETIFF tap0: Device or resource busy (errno=16)

Cannot open TUN/TAP dev /dev/tap0: No such file or directory  (errno=2) …

On The server Site:
Connection Refused (error = 111)

Please Advice