Routing problem

Hi all,

I have a strange problem and I don't know a solution.

The situation is like this:
I have a monowall running with a LAN, a WAN and several OPT interfaces.
The monowall itself has 3 physical interfaces.
1 -> WAN
2 -> LAN
3 -> NAS

The OPT interfaces are all on VLANs but the NAS, that is physical
LAN and WAN are on physical as well but have VLAN tagged.

When I am on the GUI of monowall I can ping every host in the NAS
network without any problem from the NAS interface.
But when I try that from any other interface it does not work. The rule
set is ANY-ANY so far and I see the traffic passing the firewall.

On the other side I have a storage system. Default GW is the IP of the
NAS interface of the wall. That is working fine. I can ping the wall and
I can access other systems on other OPT networks without a problem. But
from the OPT networks towards any server in the NAS network is not
possible. But you can reach the IP of the NAS interface of course.

I wonder if there is a routing limitation in monowall...

Any help is highly appreciated.

Cheers
Arne