...

The XDNS can be used for various use cases. For example: XDNS can be used for DNS based parental control function and DNS based redirect function. This specification uses the parental use case as the primary function. But the same mechanism will work on any use case that uses the tagging in the DNS request. Note that DNS server is a critical infrastructure that is built to be highly scalable with minimum overhead. Any update must be thoroughly tested and does not introduce heavy load to the server. Given this limitation, the design in the specification is designed to alleviate necessary changes in DNS server.

Architecture

Image Removed

Limitations of DNS-based Filtering Solutions

...