I taught a lesson on SIP and the DNS, and had the following question asked by a student, “How is China handling their DNS requests? Is that how they are able to filter the net?”.

It was a tad off topic, but a great question. I had a feeling that China’s Golden Shield project (The Great Firewall), was a tad more involved than just controlling zone files, so I deferred the question till the next day, until I could research a proper answer. Here’s a brief summary of what I found.

Why did China feel a need for the Golden Shield Project?

The Golden Shield […]