Think of IP Passthrough like routing.  You would need another subnet of 
routable internet IP's.  You can't passthrough an IP from your EXT subnet to 
your internal network.  A configuration like you are referring to would 
require you to setup a PSN on public IP's and use IP Passthrough filters to 
pass the appropriate traffic to/from the EXT.

Chris Green



>From: Jon Schlegel <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED]
>Subject: IP Pass Through from PSN to EXT interface Setup Problems
>Date: Mon, 08 Oct 2001 00:50:18 -0400
>
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>Hello everyone,
>
>I'm using GB-Pro 3.2.1 and would like to connect a server running on NT 4.0
>on the PSN to the EXT network via IP Pass through.  The PSN interface is
>set up to a Class C internal address (192.168.x.x) where some other servers
>are running NAT to the EXT network.  Running IP Pass Through will require,
>it seems, for the server host to be set up for one of my EXT network IPs
>of  216.42.x.x  even though it will exist on the  192.168.x.x  network of
>the PSN interface.
>
>Is this doable?  If so, what GNAT Box setup is required?  Just as
>important, what NT networking setup is required?  Do I use the EXT network
>router IP as the default gateway or do I use the PSN interface IP?
>
>
>Jon Schlegel
>[EMAIL PROTECTED]
>
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