this post was submitted on 03 Oct 2023
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Does this mean your isp can't see the sites you visit anymore?
Yes and no. If your isp is still providing unencrypted DNS for you, then they can still see the domain name you're visiting.
What if you force a dns, like say cloudflare?
Ordinary DNS requests are always plaintext and readable to anyone between you and the DNS server. So regardless of which DNS server you use, your ISP can see all your DNS lookups. For any amount of privacy for DNS, the minimum is something like DNS-over-TLS or DNS-over-HTTPS, the latter of which Firefox uses by default in some countries and supports everywhere.
I mean with this + DNS over HTTPS can we guarantee the isp can no longer see anything?
They'll only see the IP you're connecting with and encrypted data packets being transferred on.
Not just readable... The ISP can inject their own responses too. Regular DNS is both unencrypted and unauthenticated, with most clients not enforcing DNSSEC.