nelsnelson , 3 hours ago

Via ChatGPT 4 (accuracy unverified):

Yes, you can configure systemd-resolved to use the DNS servers in the order provided without dynamically switching based on speed. Here’s how you can do it:

1. Edit the resolved configuration file:

   Open the resolved.conf file in a text editor:

   
   <span style="color:#323232;">sudo nano /etc/systemd/resolved.conf
   </span>
   

2. Modify or add the following line:

   
   <span style="color:#323232;">DNS</span><span style="font-weight:bold;color:#a71d5d;">=</span><span style="color:#183691;">`</span><span style="color:#323232;">IP_of_pihole</span><span style="color:#183691;">` </span><span style="color:#323232;">`IP_of_mikrotik`
   </span><span style="color:#323232;">DNSStubListener</span><span style="font-weight:bold;color:#a71d5d;">=</span><span style="color:#183691;">no
   </span><span style="color:#323232;">FallbackDNS</span><span style="font-weight:bold;color:#a71d5d;">=
   </span>
   

   Replace IP_of_pihole and IP_of_mikrotik with your actual DNS IP addresses. This tells systemd-resolved to only use the DNS servers in the order you’ve specified.

3. Prevent automatic DNS changes by network manager:

   If you’re using NetworkManager, create a drop-in configuration to prevent it from overriding DNS settings:

   
   <span style="color:#323232;">sudo mkdir -p /etc/NetworkManager/conf.d/
   </span><span style="color:#323232;">sudo nano /etc/NetworkManager/conf.d/dns.conf
   </span>
   

   Add the following content:

   
   <span style="color:#323232;">[main]
   </span><span style="color:#323232;">dns</span><span style="font-weight:bold;color:#a71d5d;">=</span><span style="color:#183691;">none
   </span>
   

4. Restart services:

   After making these changes, restart systemd-resolved and NetworkManager:

   
   <span style="color:#323232;">sudo systemctl restart systemd-resolved
   </span><span style="color:#323232;">sudo systemctl restart NetworkManager
   </span>
   

This should ensure that your system uses the DNS servers in the order provided without any automatic switching.