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The goal for the DNS Prerequisite is that you have a domain name and you have the ability to manage the DNS records for the domain name. For multi-server portals, you will also need the ability to set up a load balancer for the portal.
If you are setting up a public webportal, you will need your own domain name for your webportal. If you are just setting up a single portal then this is really all you need.
Once you have your domain name, follow the steps for setting up the DNS for either a single server or a multi-server portal.