Problem with 2 NAT boxes behind a router

I have a setup where I have multiple static IP addresses. I want to put two
NAT boxes behind a supplied siemens router. One box is a webonramp, the
other is a linksys.

The linksys will have my ftp server behind it, the Webonramp will have
my other computers behind it. Both boxes are NAT enabled each with
different subnets.

The good news is that people can ftp into the ftp site from the internet.

The problem is that I can not ftp to the ftp site from my other subnet.

This used to work when I had both boxes plugged into a Netopia box (NAT,
DHCP, etc all turned off). This makes me think that it is the router that is
the problem.

Now that I am behind the Siemens box, I have no access to the settings. The
ISP assures me that it is "wide open."

The real problem here is that now my ISP is telling me that this
configuration CAN NOT work, EVER!!! I am floored. It used to work! Is
this really a problem with the NAT setup? I find that really hard to
believe.

Does anybody have experience with the Siemens se5940? Is this a deficiency
with that router?

What is the problem here?

Any help at all is appreciated.

Thanks,

Ephram





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