[Openvpn-users] Ethernet Bridge not quite working

[andy liebman <andyliebman@xxxxxxx>]

Hi.

I have set up an Ethernet bridge with the server on Linux (Mandriva 
2006) and the client on Windows.

I start up openvpn on the Linux machine. Start up messages indicate that 
it starts fine. Start up the client on the Windows machine. Initiate a 
connection to the Linux server and the two machines connect fine over 
the Internet. The Windows machine TAP device gets an IP address 
(10.8.0.50).

However, I can't ping the Linux server from the Windows machine, and I 
can't reach any other addresses on the Linux network.

I'm wondering if I configured the bridge startup script or server.conf 
file incorrectly. It seems to me that the bridge (br0) might have the 
wrong IP address. When I do an "ipconfig", I get back that IT has the 
address 192.168.1.90. Should the bridge take the IP address from the 
physical device that is being bridged? Should I be seeing the TAP device 
having an IP address (i.e., 10.8.0.4)?

The other weird thing is that ipconfig tells me the bridge is being made 
with an Intel e100 (which is a NIC associated with eth2, not eth1). Eth1 
is a Gigabit NIC and it uses the e1000 driver.

The particulars of my set up are as follows.

The Linux box has 2 Ethernet ports and a IEEE 1394 port.
-- eth0 is associated with the IEEE 1394 port
-- eth1 is assocaited with an Intel Pro 1000 Gigabit NIC and has IP
   address 192.168.1.90, by which the machine connects to the Office
   network
-- eth2 is associated with a 10/100 Intel NIC (e100)

I set up the bridgestarup.sh script as follows:

   # 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="eth1"
   eth_ip="192.168.1.90"
   eth_netmask="255.255.255.0"
   eth_broadcast="192.168.1.255"



In the server.conf script, I set up the server-bridge line as follows.

   server-bridge 10.8.0.4 255.255.255.0 10.8.0.50 10.8.0.100

I don't currently have a firewall running on the Linux server -- it is 
behind a CableDSL router using NAT, with the openvpn port forwarded to 
the Linux box.

Any good suggestions on how to resolve this problem would be appreciated.

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