Privacy

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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 [email protected] to c/[email protected]

8 comments fedilink hide all child comments

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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[–] [email protected] -2 points 4 months ago* (last edited 3 months ago) (1 children)

I believe your ISP can modify the default DNS of your router so when you connect through DHCP a device it will set that DNS, but if you manually set the DNS in your device ISP can't notice it.

[–] [email protected] 7 points 4 months ago

They can modify the DNS packets still. They aren't encrypted or signed so the authenticity of a response packet cannot be verified. Parental controls from ISP relay on being able to snoop and modify your DNS (and SNI from TLS ClientHello packets).