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If you run a single DNS server, you will always have downtime when it's restarted.
The only way to mitigate that, is to run 2 DNS servers.
I setup my network to use pihole as the first DNS and the router as the second, most of the time pihole is used. Unless it's down
Just be sure that the second server in the list is also a black hole. If you don't, all black holed requests will fallback to the second DNS... which, if it doesn't also black hole them, will wind up serving you ads and defeating the point!
Personally I find a single Pi is just fine for DNS. It only takes like 10 seconds to reboot. Less, if you use M.2 storage via a HAT or boot from USB! That's pretty fine downtime. But if you're afraid you'll knock over the network and get yelled at by your family or housemates, best to use a backup :)
How do you set up clients so they will always use the first one? I thought if a client knows 2 servers they will switch between them.
I plan to add a second Pihole at some point and keep them synced
Yeah, you can't. There is no guarantee that clients will use dns servers in any particular order.
When it comes to a “secondary”DNS... [there is nothing like a primary and secondary DNS server. These indications are quite misleading but many systems adopted it this way. Pihole only list the DNS servers as primary and secondary, because this is what the providers write on their pages. The bad phrasing is supported especially by how Windows handles it.](https://discourse.pi-hole.net/t/primary-vs-secondary-dns/1536/2)
[Most operating systems implement DNS servers as alternatives, not as fallbacks, i.e. they will query any of both servers from time to time, so it is quite likely that you will loose your Pi-hole filtering capabilities (at least partially) [if you specify a secondary DNS server on your network].](https://discourse.pi-hole.net/t/secondary-dns-server-for-dhcp/1874)
The **ONLY** DNS server you should have set on your network is a/the PiHole(s).
That's what I thought. Btw, your formatting seems to be broken.
Thanks for that; the formatting is broken.
I’ll try and figure out how to fix it (it was formatted for the “site that shall not be named”)
Are you using pihole to also create custom local DNS records?
Yes, mostly just the hostnames
When it comes to a “secondary”DNS... [there is nothing like a primary and secondary DNS server. These indications are quite misleading but many systems adopted it this way. Pihole only list the DNS servers as primary and secondary, because this is what the providers write on their pages. The bad phrasing is supported especially by how Windows handles it.](https://discourse.pi-hole.net/t/primary-vs-secondary-dns/1536/2)
[Most operating systems implement DNS servers as alternatives, not as fallbacks, i.e. they will query any of both servers from time to time, so it is quite likely that you will loose your Pi-hole filtering capabilities (at least partially) [if you specify a secondary DNS server on your network].](https://discourse.pi-hole.net/t/secondary-dns-server-for-dhcp/1874)
The **ONLY** DNS server you should have set on your network is a/the PiHole(s).
Why wouldn't you just use DNS on your router
Router may not have a function you want.
Instead of paying for a raspberry Pi you could just get a OpenWRT device. You can get the router equivalent of a rust bucket since chances are you are not using the Wireless portion anyway.
Sure, OpenWRT is good and there’s an Adguard Home plugin for it. You don’t need to buy any hardware to use Pihole though, many people run it in a container on an existing machine. So it comes down to the functionality you need or want and the software you prefer, right?