Problem with 2 NAT boxes behind a router

Problem with 2 NAT boxes behind a router
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Subject Author Date
Problem with 2 NAT boxes behind a router E 02-10-2006
Posted by E on February 10, 2006, 12:23 pm
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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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Posted by glen herrmannsfeldt on February 10, 2006, 1:07 pm
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> 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.


This is a TCP/IP question, not at all an ethernet question.

While some people here might know the answer, comp.protocols.tcp-ip
is a better choice.

To me it seems like it should work if the siemens router does
what routers are supposed to do.

Try the tcp-ip group and see if you get more replies.

-- glen

Posted by E on February 10, 2006, 1:39 pm
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Glen,

Thanks for the pointer.

It's off to comp.protocols.tcp-ip for me.

Ephram

>> 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.
>
>
> This is a TCP/IP question, not at all an ethernet question.
>
> While some people here might know the answer, comp.protocols.tcp-ip
> is a better choice.
>
> To me it seems like it should work if the siemens router does
> what routers are supposed to do.
>
> Try the tcp-ip group and see if you get more replies.
>
> -- glen



Posted by William P.N. Smith on February 11, 2006, 7:31 pm
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>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.

Are you specifying the "WAN" IP address of the Linksys router as your
FTP target from clients on the "LAN" side of the Webonramp box?

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