this post was submitted on 09 Jan 2025
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There's a barrier to entry in those cases. If you're DNS actively reroutes people are mostly inclined not to try and figure out a way to bypass it - unless bothered, like we see with the porn access law in Florida.
In any case, you can do packet dropping on a routing level from the ISP - which technically isn't a national firewall, even if it serves the same purpose.
Segmenting the internet means doing routing in a way where the link between nodes is actively blocked, which is something completely different and is more what you'll get behind the Chinese "firewall" - when it is more like a physical barrier than a firewall rule, because it'll be impossible to actually facilitate a manual link, whereas a DNS blocking can be more easily bypassed.
There's level to these problems and just having a "national firewall" means nothing, because it doesn't get down to the minutia of what's actually being achieved.