Ascend Archive
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Re: (ASCEND) Q. Can you run servers behind Pipeline (running NAT)?

On Wed, 12 Nov 1997, Edwin Yeh wrote:

> I don't know exactly how NAT works. (I'll be interested to know. All I can
> guess, is that when the packet exists the router, somehow the header
> information is wrapped.)

>From http://www.ascend.com/895.html :

When the Pipeline first connects to the NAS, it receives an initial IP
address via PPP negotiation. The Pipeline then builds a
 lookup table that matches the workstation's bogus address with the
registered address that the NAS assigns. The Pipeline
 re-addresses packets destined for your workstation (i.e., destined to the
registered address) with the bogus address it actually has.
 This translation is transparent both to the workstation and to devices on
the WAN. 

> 
> But can you run servers (such as ftp server or web server) behnid the
> Pipeline router (running NAT)?

Yes you can run them, but users from the outside world will not be able to
hit them.

> 
> In other words, is there a way for outside users to point to a specific
> machine inside the NAT subnet.

No.

> 
> Thanks.
> 
> Edwin
> 
> P.S. I can think of a solution. That is, don't use NAT and run DNS after the
> pipeline router. The DNS effectively become the router and the pipeline
> effectively become a Terminal Adapter. But if this is the case, why buy the
> pipeline. We can do it with ~$150 ISDN TA. We are using pipeline because
> it's cost effective for a subnet running multiple machines and the router
> performs better than the computer. However, functionality will come before
> performance. If we cannot solve this problem, we will be forced to drop the
> pipeline solution.

I totally dont understand what you mean by "The DNS effectively becomes
the router", as they are two TOTALLY different things, doing two TOTALLY
different functions, but your overall answer is NO.  Go buy a Motorola
BitSucker Pro for $150, and save some cash.

Scott R. Chrestman
System Administrator
Netropolis Communications Corp.
src@netropolis.net

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