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Is it possible for my ISP (or the router in my network) to modify results of someone else's DNS? (lemmy.ca)

submitted 4 months ago by hackysphere@lemmy.ca to c/privacy@lemmy.ml

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I am wondering if an ISP or network admin on my network would be able to change where a DNS server is located at (ex: if a DNS server is located at 132.192.175.210, the ISP/netadmin can redirect it to their own server at 11.29.102.201 to change where the DNS records point to). Does DNSSEC and DoH/DoT combat this, and how? Why is it safe to use a domain for DoH/DoT if it requires going through insecure DNS to get to a secure DNS?

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[–] explore_broaden@midwest.social 16 points 4 months ago* (last edited 4 months ago)

Unless you are verifying DNSSEC, they could intercept any outgoing DNS queries and replace the response with whatever they want, if you are using DNSSEC they won’t be able to modify the responses since they can’t create the signatures, but they could still send queries to their own server instead of your chosen server. With either of these options they can still see what you query. DNS over TLS or HTTPS is a way to prevent all of these things, since with those you know the endpoint of your HTTPS connection is the actual server with the signed certificate and the connection is encrypted.

Edit to add: it shouldn’t matter what DNS you use to look up the IP of the DoH/DoT server, because only the real servers should have the correct private key.