Domain whitelisting is a process of identifying a subset of domains that should be allowed to access a specific resource. Whitelisting is commonly used to allow access to a secure network from untrusted networks.
Domain whitelisting can also be used to allow access to a specific resource from a trusted network.
There are a few methods that can be used to whitelist a domain in DNS. The most common method is to use a CNAME record. A CNAME record points to a different domain name.
The original domain name is whitelisted, and the CNAME record points to the new domain name. When a client tries to access the resource at the original domain name, the DNS server will look for the CNAME record and allow the request.
Another method is to use a A record. A A record points to an IP address.
The DNS server will look for the A record and allow the request. This method is less common, because it is more difficult to create a valid A record.
One final method is to use a NS record. A NS record is a domain name record.
The DNS server will look for the NS record and allow the request. This method is the most common method, because it is easier to create a valid NS record.
When domain whitelisting is used, it is important to remember the following tips:
1. Use a method that is easy to create and use.
2. Use a method that is effective.
3. Use a method that is reliable.
4. Use a method that is safe.
5. Use a method that is secure.
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Domain whitelisting is a powerful tool that can be used to allow access to a secure network from an untrusted network. It is important to use a method that is reliable, safe, and effective.
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