Devices getting router IP as DNS

Submitted ⁨⁨11⁩ ⁨months⁩ ago⁩ by ⁨shiftymccool@lemm.ee⁩ to ⁨selfhosted@lemmy.world⁩

Hello all! I think I’m having a bit of trouble with my home network. It appears that all of my devices are using my Pi-hole DNS because I can see them all listed in the UI. But, when I check the devices, I can see both the Pi-hole IP address and the router’s. Pi-hole is listed first, so I’m assuming everything is using that, but I don’t want the devices on my network to even know about the router DNS. I’ve heard of aggressive devices like Roku exploiting things like this.

I have an ASUS RT-AX55 so I believe I have full control of any setting I need. Any advice? Is this not even a problem?

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returned@sh.itjust.works ⁨11⁩ ⁨months⁩ ago
The DHCP server pushes the DNS configuration to the clients. Is your Asus router running the DHCP server? If so, set the DNS to point to your Pi-Hole

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- shiftymccool@lemm.ee ⁨11⁩ ⁨months⁩ ago
  I have my router as DHCP and I also have the DNS set to the pi-hole which I’m assuming is how the devices are getting it. I’m just not sure why it’s getting my router IP as well.
  
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  - kylian0087@lemmy.world ⁨11⁩ ⁨months⁩ ago
    Perhaps because the curent lease has not expired yet. Remove the lease in the router or force the client to get a new lease
    
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  - returned@sh.itjust.works ⁨11⁩ ⁨months⁩ ago
    Some devices get confused if there is only one DNS server provided by the DHCP… Maybe try setting your PiHole IP for both “Primary” and “Alternative” DNS server
    
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  - grayaytrox@lemmy.world ⁨11⁩ ⁨months⁩ ago
    Your router is the gateway to the internet. I could be wrong here, but this is why your devices can see it. They need to know where they can access the internet.
    
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BearOfaTime@lemm.ee ⁨11⁩ ⁨months⁩ ago
Is DNS enabled on your router? It’s usually (or should be, imo) a separate setting from DHCP.

Turn off the routers DNS server, then it’ll have no reason to add the IP to the DHCP Config.

Double check the DHCP Config on the router to ensure it’s only deploying the Pihole address.

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walden@sub.wetshaving.social ⁨11⁩ ⁨months⁩ ago
Like the other poster said, this will be configured on your routers settings. You can configure more than one DNS address, the 2nd (etc.) being backups if the first one stops working.

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- shiftymccool@lemm.ee ⁨11⁩ ⁨months⁩ ago
  The router is running DHCP and is set to hand out the Pi-hole IP as DNS. Interestingly, there’s only one field for this so maybe the router is choosing itself as DNS2? If I go into WAN settings, there are fields for DNS1 & 2 but if I was under the impression that these should be set for upstream DNS.
  
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  - princessnorah@lemmy.blahaj.zone ⁨11⁩ ⁨months⁩ ago
    I’m running the Merlin fork of the Asus firmware, so maybe that adds this option, but in my DHCP settings there’s a switch called:
    
    Advertise router’s IP in addition to user-specified DNS
    
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    Sidenote: The Merlin version of the firmware is great! It lets you run the Diversion adblocker, which functions in the same way as Pihole. However, the RT-AX55U isn’t supported. The AX58U is though, maybe it might be worth upgrading? It’s a lot simpler than running a Pihole separately.
    
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  - dan@upvote.au ⁨11⁩ ⁨months⁩ ago
    If you can’t figure it out, you can always use your PiHole as a DHCP server.
    
    If I go into WAN settings, there are fields for DNS1 & 2 but if I was under the impression that these should be set for upstream DNS.
    
    Try set those to your PiHole IP. Then, even if a DNS request goes to your router, it should send the request to PiHole rather than the ISP’s DNS servers.
    
    By the way, I’d recommend running two PiHole instances so that the internet doesn’t break if you have to take one of them down. There’s a system for AdGuard Home that lets you keep the config for multiple instances in sync - maybe there’s something like that for PiHole too.
    
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Decronym@lemmy.decronym.xyz ⁨11⁩ ⁨months⁩ ago
Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I’ve seen in this thread:

Fewer Letters More Letters

DNS Domain Name Service/System

IP Internet Protocol

PiHole Network-wide ad-blocker (DNS sinkhole)

[Thread #363 for this sub, first seen 19th Dec 2023, 06:05] [FAQ] [Full list] [Contact] [Source code]

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Fewer Letters	More Letters
DNS	Domain Name Service/System
IP	Internet Protocol
PiHole	Network-wide ad-blocker (DNS sinkhole)