I am trying to make the following connection:

WindowsXP(OpenVPN-Client)->shorewall->Internet->LinksysWRTG->OpenVPN-Server

...of course the reverse path too.

The OpenVPN server is running in bridge mode.

When the openVPN client is launched it looks like a successful connection is 
made.  The openVPN client
gets assigned an address from the openVPN server pool.  The OpenVPN client's 
routing table gets updated
to include the following:

===========================================================================
Active Routes:
Network Destination     Netmask         Gateway         Interface       Metric
a.b.c.0                 255.255.255.0   a.b.c.250       a.b.c.250       30
a.b.c.250               255.255.255.255 127.0.0.1       127.0.0.1       30
a.b.c.255               255.255.255.255 a.b.c.250       a.b.c.250       30

where a.b.c is the sub-net of the bridged network, and the .250 address is the 
IP assigned to the
OpenVPN client's TAP device.

So at this point I believe shorewall is out of the picture because any traffic 
going to a.b.c.0/24
should be going through the encrypted tunnel and shorewall would not do any 
filtering on this traffic. 
Is this a correct assumption?

I ask this because I am unable to communicate with any devices on the 
a.b.c.0/24 network.

I have read the following, but I do not believe they apply.
http://www.shorewall.net/VPN.htm
http://www.shorewall.net/manpages/shorewall-tunnels.html

I did actually try to setup the OpenVPN client connection from the shorewall 
server too, but again I
could never get it to work.  Plus this is not really what I wanted, I was just 
trying something else. 
I basically kept getting a destination unreachable (PING) when the OpenVPN 
client was installed on the
shorewall server.  Again the TAP0 device seemed to get connected OK, but it did 
not matter how many
changes I made to the policy, zones, interface, tunnels, and masq files; no 
combination gave me a
successful result.

I just want to make sure I am focusing my research in the right place.  I don't 
think this is a
shorewall issue, but I wanted to get a second opinion.

Thanks for your help.

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