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How do I setup multiple external IP address to map to internal IP addresses?

Posted on 2009-07-09
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Last Modified: 2013-12-14
We have a cable internet connection with 5 static IP addresses.  Initially, we had just one, which was then forwarded to our SBS internally with the appropriate ports opened up for RWW, etc.  We added the other statics to be able to access 4 other machines on the internal network directly through RDP.  The main reason is that the iPhone doesn't support ActiveX, so RWW is out of the question.

Since port forwarding seems to only account for one external IP address, how can I map an external IP address to an internal IP address so that each static external will access an internal machine?  The router being used is a NetGear WNR3500, and while the router isn't handling DHCP (SBS is), we have address reservations, so they are basically static internals.

Any assistance will be greatly appreciated!
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Question by:wukovits
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Rick Fee earned 1500 total points
ID: 24818287
I'm not familiar with this specific model, but most Netgear devices do not allow One-to-One NATs.    So if you want to setup one to one nat you will have to get something else like a Sonicwall or Cisco firewall.

"iPhone doesn't support ActiveX"  Do you mean Active Sync?    Which is does if firmware version 2.0 or greater

But if you looking to setup Remote Desktop for these workstation you can customize the ports for RDP and setup port forwarding will work so you don't need to get new hardware:

http://support.microsoft.com/kb/187623

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by:wukovits
ID: 24818376
I guess I'll do the method you described, I had hoped that it could be accomplished with their existing hardware, but c'est la vie.

For RWW, you need to have ActiveX for it to connect with the remote desktops through the browser.  The problem is that Safari doesn't support ActiveX, which the iPhone uses for it's browser.  There are a number of third party apps for remote desktop connection from the iPhone, so this solution will work.

Thanks for the help.
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by:Rick Fee
ID: 24818572
Well you can accomplish with your existing hardware by setting up the workstations for unique RDP ports

Workstation1  = 3390
Workstation2  = 3391
Workstation3  = 3392
Workstation4  = 3393
Workstation5  = 3394

Then setup port forwarding on the Netgear

From RDC then it will be IP:3390    example   24.42.53.3:3390   or even the A records  mail.mydomain.com:3390

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