On 7/9/10 1:03 AM, Markus Plessing wrote:
> Hello,
> 
> I'm trying to set up shorewall to allow traffic from a single
> host behind the firewall to a remote network both connected
> as openvpn clients to an openvpn-server on the internet.
> 
> |---------------|       |---------------|
> |     local     |       |     local     |
> |   vpn client  | ----- |   shorewall   |
> | 191.168.0.159 |       |  192.168.0.1  |
> |---------------|       |---------------|
>                                  |
> |---------------|       |---------------|
> |     remote    |       |   internet    |
> |   vpn client  | ----- |  vpn server   |
> |  192.168.6.1  |       |               |
> |---------------|       |---------------|
> 
> 
> This scenario worked out completely without a running firewall
> so it seems not to be a routing problem on the server.
> 
> My first approach to get this done was to open the port openvpn
> needs to connect to the server and thought, that all traffic
> will use this tunnel ... but this didn't work out. Only the
> tunnel will be established, but other traffic seems to be blocked.
> 
> ACCEPT          loc             net             tcp 1202
> 
> I've found several explanations to setup a vpn connection having
> the openvpn client or server and the shorewall on the same host,
> but no information helping me on this issue.
> 
> Is someone able to direct me to the solution?

If the tunnel is being established fully, then the firewall rules are
not the problem; traffic sent through the tunnel is not visible to the
firewall; all the firewall is aware of are the TCP 1202 packets and
responses.

Is the VPN server assigning addresses that are in the 192.168.0.0/24
network? That would account for the results you are seeing (connect the
client box directly to the internet and the tunnel would work; put it
behind the masquerading firewall and it would not work).

-Tom
-- 
Tom Eastep        \ When I die, I want to go like my Grandfather who
Shoreline,         \ died peacefully in his sleep. Not screaming like
Washington, USA     \ all of the passengers in his car
http://shorewall.net \________________________________________________

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