this post was submitted on 16 Aug 2023
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DNS hijacking (lemmy.world)
submitted 2 years ago* (last edited 2 years ago) by 3laws@lemmy.world to c/selfhosted@lemmy.world
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EDIT: So because of my $0 budget and the fact that my uptime is around 50% (PC, no additional servers) I ended up using NextDNS. For the time being it works (according to dnsleaktest), an added benefit was improved ad-blocking (100% in this tool). I now have plans for a proper router in the future with a Pi-hole. Thanks so much for all the info & suggestions, definitely learnt a lot.

So it turns out I got myself into an ISP that was shittier than expected (I already knew it was kinda shitty), they DNS hijack for whatever reason and I can't manually set my own DNS on my router or even my devices.

Cyber security has never been my forte but I'm always trying to keep learning as I go. I've read that common solutions involve using a different port (54) or getting a different modem/router or just adding a router.

Are they all true? Whats the cheapest, easiest way of dealing with all of this?

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[–] 3laws@lemmy.world 2 points 2 years ago (2 children)

Why can you not set your own DNS on your devices?

I can, they get redirected to my ISPs DNS, no matter what. This was not an issue with my pervious company.

[–] neuromancer@lemmy.world 6 points 2 years ago* (last edited 2 years ago)

You can use DNS over HTTPS or TLS with Quad9 https://www.quad9.net/service/service-addresses-and-features

If you are using PiHole just use that as the forward DNS.

[–] greenashura@sh.itjust.works 2 points 2 years ago (1 children)

How are you detecting this? Just curiosity

[–] dan@upvote.au 6 points 2 years ago* (last edited 2 years ago) (1 children)

Often, if you try to go to a non-existent domain, it'll still return an IP address that loads a "this site doesn't exist" page hosted by the ISP, often full of sponsored links, similar to a domain parking page.

It's trivial to do this. DNS requests are unencrypted and can easily be modified by an ISP, even if you use a custom DNS server like Google's 8.8.8.8 or Cloudflare's 1.1.1.1. You need DNS over HTTPS or a similar technology to prevent this happening.

[–] ares35@kbin.social 2 points 2 years ago

hijacking dns is also my provider's first action when you're late paying the bill. by ip or doh or a long-lived dns cache and you're still going, but anything looked-up via a 'regular' dns server goes nowhere. that gets you another 2-3 weeks until they deny the modem from even authenticating.