Weird Pi Hole problem - 'disable' function completely stops DNS?

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timmmay

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#272982 29-Jul-2020 07:22

I have Pi Hole v5.1 on my network doing DHCP and DNS. I used the web interface "disable" function this morning, instead of disabling ad blocking it seemed to completely disable DNS, meaning I couldn't resolve IP addresses.

Can anyone else reproduce this before I report a bug? It might be dependent on using Pi Hole DHCP. I use Pi Hole DHCP as the Fritzbox doesn't delegate IPv6 properly.

Pi-hole v5.1.1

Web Interface v5.1

FTL v5.1

nzkc

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#2530527 29-Jul-2020 08:58

Can't reproduce. My set up isn't 100% the same as yours. Running the same versions, however, I use my router for DHCP and run Pihole from docker (on a Raspberry Pi).

When I disabled Pihole my first attempt to connect to a website timed out and I though "oh...it is a problem he's reporting" but second attempt and other websites worked fine. So may have just been a glitch in the matrix. Adverts were definitely disabled too.

neb

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#2530771 29-Jul-2020 14:10

nzkc:
When I disabled Pihole my first attempt to connect to a website timed out and I though "oh...it is a problem he's reporting" but second attempt and other websites worked fine.

Have you set both your primary and secondary to the Pihole?

timmmay

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#2530792 29-Jul-2020 14:46

Thanks @nzkc, I'll have a go on my main computer this evening then, could be some other network weirdness going on.

neb:
nzkc:

When I disabled Pihole my first attempt to connect to a website timed out and I though "oh...it is a problem he's reporting" but second attempt and other websites worked fine.

Have you set both your primary and secondary to the Pihole?

Pi Hole is doing DHCP and only hands out a primary AFAIK.

Lease Obtained. . . . . . . . . . : Wednesday, 29 July 2020 9:08:18 am
Lease Expires . . . . . . . . . . : Thursday, 30 July 2020 9:08:19 am
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.PIHOLE-IP
DNS Servers . . . . . . . . . . . : 192.168.1.PIHOLE-IP
NetBIOS over Tcpip. . . . . . . . : Enabled

neb

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#2530798 29-Jul-2020 14:51

The reason I asked is that with a secondary not set to the Pihole you're getting a lot of your DNS queries via the secondary as a matter of course. The names "primary" and "secondary" are misleading, it's really just "option 1" and "option 2". So if @timmmay has primary and secondary set to the Pihole but you have primary = Pihole secondary = something else, you wouldn't see the issue because some of your queries are being sent to option 1 and some to option 2, which means with retries you'll eventually query the non-Pihole source and the name will resolve.

timmmay

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#2530811 29-Jul-2020 15:12

In my ethernet settings TCP has "use DHCP set". ipconfig/all is showing only a single DNS server. So I don't think it's that, thanks.

nzkc

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#2530885 29-Jul-2020 17:25

Bit late on the replies...

Like Timmmay I have just the pihole set as my only dns server. As mentioned that's configured by the router that is my dhcp server too.

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timmmay

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#2531126 29-Jul-2020 21:54

I tried this on my main computer, same behavior. I rebooted the Pi, problem solved.

That's a weird one. Thanks all!