We're running out of IP addresses and must implement Network Address Translation (NAT) on our school district's four-school WAN. Our Windows NT network uses 3Com's Linkbuilder FMS 2 and Netbuilder Remote Office routers and hubs at each site. We think we know what router and firewall hardware we need at the site linking us to our ISP via a T-1 line, but what do we need at the other sites?
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A single NAT gateway on the Internet T-1 can hide your whole network. Renumber the IP addresses on your internal routers to use private IP addresses. Switch your intranet servers to private IP addresses.
Your Internet servers will need to be configured in your NAT gateway. Convert your Dynamic Host Configuration servers’ IP address pools to the private IP scheme. The NAT reference page for 3Com’s Netbuilder is under the Service & Support/Routers/ Netbuilder area at www.3com.com.
Make sure to re-address one campus at a time. When you renumber a site and turn on NAT at the router that connects them to the rest of your network, they will see them behind the same old IP address on the same old router. That way you don’t have to do the whole network at once.
