Concerns over DNS Blocking
Concerns over DNS Blocking
"Concerns over DNS Blocking" by Vinton Cerf
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PiHole with upstream dns-over-tls or dns-over-https.
Anybody who wants to can get around DNS blocks. Sure it'll stop Aunt Sally, but anyone who cares will get around it. It's a really dumb way of doing things.
Well our government likes doing dumb things. That is kind of their platform lately.
As as US idiot, it feels good to have been right about how much of a corpo scumfuck Macron is.
As as US idiot,
Checks out.
We knew. Well, at least some of us did. Why call yourself an idiot though ?
It’s trivial for me to detect and block dns over https with modern firewalls.
How? I don't see what could find dns-over-https in the middle of other https traffic?
there is a lot more to modern firewall app detection than ports. My Palo Alto has a specific category to detect and block dns over https.
Even Palo Alto notes that they can only effectively block DoH if you're MITMing all https traffic already (e.g. using a root certificate on corporate-managed devices). If not able to MITM the connection, it will still try to block popular DoH providers, though.
For rather cheap I can see what traffic is suspicious. If you throw more resources at the problem and scale up it becomes simple to see traffic that looks like dns over https without having to decrypt it. Indicators such as size, frequency, consistent traffic going from your host to your DoH provider and then traffic going to other parts of the internet….these patterns become easy to establish. Once you have a good idea that a host on the internet is a DoH provider you can drop it into that category and block it.
Fair enough. Doesn't bode well for DoH in authoritarian regimes.
Port number is pretty indicative of DNS traffic, if we're talking IPv4.
DNS over HTTPS just uses port 443 like any other traffic.