From: brian-heil@uiowa.edu   
      
   Not sure if that subject line says what I really want to do.   
   I've got a remote office location (currently behind NAT) that I want to extend   
   a class C subnet to for Active Directory Authentication.  Ideally I'd stick a   
   Domain Controller there and connect it up via VPN, but for various reasons I   
   can't do this.   
   So my second thought was simply extend the net to allow the clients in the   
   remote location to connect to the DC back on the public network (the connection   
   will be at least a T1).   
   What I can't figure out is how to get the VPN configured to do this.   
   Essentially the DCs on are on a public class c network and I'm unsure how to   
   configure the VPN to route the encrypted stuff to the public net.   
      
   Can I set both the public and private IPs to numbers on the same subnet (I'm   
   guessing this would confuse the routing tables on the VPN box)   
   Or do I need to configure a single interface (I'm guessing the private one) to   
   use a public address on the subnet?   
   Or will this just not work?  If that is the case, I'm wondering what   
   alternatives there are to accomplish this.   
      
   After reading several dozen pages of documentation from Cisco, I suspect that   
   what I'm trying to do is 'remote bridging' but I haven't been able to decipher   
   if this is possible when one of the VPN tunnel endpoints is a public class C   
   network.  Or if something like the 3000 series concentrator will do what I   
   want.   
      
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