2010/12/13 Tom Eastep <[email protected]>:
> On 12/13/10 9:36 AM, sond wrote:
>
> FORGET THE NAMES. You have a two-port bridge; that's exactly what the
> article has.
>

Ok I'm sorry. My fault , my thoughts was confused.
I have the portA (link layer interface eth0) and portB (link layer
interface tap0).
I hope I'm ok with this basic configuration. Can you check it out?

world   br0            192.168.100.255          bridge,routeback
net      br0:eth0
loc      br0:tap0

fw                 firewall
world            ipv4
net:world       bport
vpn:world       bport

vpn         net        ACCEPT
net         vpn        ACCEPT
net         world     ACCEPT
world      net        ACCEPT
net         all         DROP           info
all          all         REJECT        info


>
> I'm lost. You have a bridge so everything should be in one IP network
> and one broadcast domain. Why do you need any form of NAT?
>

The question for the NAT regards a real practical problem.
I want to remind that the office router/modem has a NAT one-to-one
from a public static ip (89.x.y.z) to the br0 ubuntu host ip.
(I know that's a potential security hole but for it has to be in this way.)
Let suppose I want to reach a shared folder (or a web server, or a ftp
server and so on) using the 89.x.y.z.
How can I permit that?
I know I have to forward the right port to the right host and this is
why I thought to the DNAT rules.
Something like "DNAT     net     loc:192.168.100.10  tcp    www" for a
webserver.
Where am I wrong?

Thanks again and sorry for my past and present (possible) mistake,

Marco

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