How Do Countries Filter the Internet
You’d be surprised how many countries filter what you can access over the Internet. Of course you won’t always know if you’ve been filtered or not, there’s a big difference in how transparent this filtering is to. Sometimes you’ll get a polite message, other times a kinda scary warning but very often just a 404 Page not found that people presume is their connection playing up. If you use the best anonymous surfing technology bby the way you can bypass all of these.
There are three general ways that countries use to filter the web sites you can visit. There’s the worst one which is DNS filtering, here the country will modify all the ISP DNS tables and route somewhere else This is actually easy to bypass because all you need to do is resolve addresses from a proper DNS server somewhere else on the Internet. The other two are IP filtering (blocking specific IP addresses) which rarely works well and URL filtering. URL filtering is the most sophisticated although still has it’s problems, here the country builds up a black list of web sites you cannot visit and blocks access to those URLs.
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