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trihomed DMZ

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trihomed DMZ - 4.Sep.2007 2:43:11 PM   


Posts: 1
Joined: 4.Sep.2007
Status: offline
I currently have a network that was very confusing.  With some changes we decided to migrate it too a more unified network.  My ISP gives me a block of 5 IP addresses in the subnet.  What I am wanting to do is the following: (NOTE: Addresses are changed for security)

Internet ------ ISA Server ----------------Internal LAN (Using NAT)
   (Outside Address        (Gateway on ISA:
  (Subnet               (Subnet
  (Gateway                    (IP of Clients:
             Perimeter Network (Using Routing)
             (Outside Address from ISP Assigned to Perimeter DMZ
              (IP Addresses of clients: I want them to be -

Sorry about the piture its bad  But basically the just of what I am wanting to do is have my ISA Box act as a Transparent Firewall for the Perimeter and perform NAT for the Internal Lan.  I was trying to setup the perimeter dmz using one of my isp's ip's on the dmz nic, but am not sure if thats correct since they are in the same subnet. I CANNOT subnet my ISP's assigned range, its not possible and they will not give me a seperate subnet of ip's without a large hassle.  I am at a loss of how to complete this setup and after reading every ISA book I can find, I'm still stuck.  Any assitance is appreciated. 
Post #: 1

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