Setting a backup DNS on the router

Help
1

Hello,

Having the same issue (keep Internet while my Raspberry is off), could you tell me what is the solution?
I put a secondary DNS on my router but am unable to access pi.hole/admin while I do that.

Please, what solution do you use to stay connected while the raspberry is disconnected?

Edit : sorry, I thought that it was better to continue on an existing topic...

Setup :

  • I have the Pi connected to my Internet provider's box;
  • my router is connected to the box and all peripherals in my house are connected to this router;
  • 2 DNS are specified to the router : Primary : the Pi, secondary : another one from my Internet Provider;

Problems :

  • pi.hole/admin is not active anymore when a secondary DNS is specified;
  • I specified 2 DNS for when the Pi is disconnected from the network but apparently both are constantly used;

Thank you

2

A Pi-hole should have close to 24/7 uptime, as it's an essential part of the network. If your Pi-hole is not always on, consider installing Pi-hole on a system that is always on, or manually switch the DNS server on the router when you turn the Pi-hole off and on. Since many devices use the "primary" and "secondary" DNS servers interchangeably, you will run into problems if you have a backup DNS server alongside the Pi-hole in the router's DNS settings.

3

Why is your Raspberry getting disconnected (I suppose saving some small amount of energy)?

Mine at home did never cause any issues over more than half a year of continuous runtime. Having said that, I have redundancy installed in the enterprise environment in which I use Pi-hole (> 50 clients). It is as simple as setting up two Raspberries, preferably in different locations.

4

Because I was afraid of killing it by letting him always ON. Its temperature is 51.5°C in idle (normal?) so I thought it is hard for such a small thing to keep warm so long.
But I will leave it alone if it is not that weak.
Thank you!

5

The raspberry pi should be fine <70 degrees Celsius.

6

And:

When the Soc hits 85 it is clocked back to reduce temperature.

https://www.raspberrypi.org/forums/viewtopic.php?f=98&t=74908

7

Thanks for the link.
I saw yesterday a small red thermometer while I was looking at some Youtube videos on Chromium (very stuttered at 720P/1080p).
It is my first Raspberry and so told myself that I was asking a bit much to it and should consider sparing it sometimes.