DNS Cache Poisoning is one method to perform censorship, however people could bypass it by distributing customized /etc/hosts file, when youtube and twitter wer

DNS Cache Poisoning is one method to perform censorship, however people could bypass it by distributing customized /etc/hosts file, when youtube and twitter were first blocked, it's widely used. Then ppl behind GFW realized that, they deployed keyword detection and IP blocking. Nowadays, to access "outside world" Chinese ppl have to use VPN or encrypted proxies.