this post was submitted on 04 Feb 2024
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When Pi-hole is down? (lemmy.world)
submitted 7 months ago by machinin@lemmy.world to c/selfhosted@lemmy.world
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I have an asus router with a pi-hole on the network.

I was doing some work on my server and noticed that when pi-hole was down, I couldn't access the internet. I was looking for some ideas online how to deal with this, but they said to have a second pihole on the network in case one is offline. Is that the only way to do it? Is there any way to have the network go back to normal if the pihole is offline?

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[–] magikmw@lemm.ee 1 points 7 months ago* (last edited 7 months ago) (2 children)

I think it depends. In my limited experience, because I have not tested this thoroughly, most systems pick the first DNS adresses and only send requests to the second if first doesn't respond.

This has lead at least a couple of times to extremely long timeouts making me think the system is unresponsive, especially with things like kerberos ssh login and such.

I personally set up my DHCP to provide pihole as primary, and my off site IPA master as secondary (so I still have internal split brain DNS working in case the entire VM host goes down).

Now I kinda want to test if that offsite DNS gets any requests in normal use. Maybe would explain some ad leaks on twitch.tv (likely twitch just using the same hosts for video and ads, but who knows).

Edit: If that is indeed the case, I'm not looking forward to maintaining another pihole offsite. Ehhh.

[–] CurbsTickle@lemmy.world 6 points 7 months ago

It is entirely the case.

DNS queries will go to all on the list, and use whatever responds first.

If you are seeing occasional ad leaks, this is why.