Ubuntu Network, set up dns

check if system is using systemd-resolved

systemctl status systemd-resolved

change global dns

sudo nano /etc/systemd/resolved.conf

[Resolve] DNS=8.8.8.8 1.1.1.1 FallbackDNS=8.8.4.4 1.0.0.1

sudo systemctl restart systemd-resolved

// check resolve status (You have to create a seperate network file if u are not using global but a specific network interface)

resolvectl status

// Two approaches for a specific network interface

ls /etc/systemd/network/

sudo nano /etc/systemd/network/<networInterfaceId>.network

[Match] Name=enp0s3<networkinterfaceId>

 [Network] 

DNS=8.8.8.8 

DNS=1.1.1.1

sudo systemctl restart systemd-networkd * Might need to reboot machine

---------onetime solution(not recommneded)

Unlink the Current /etc/resolv.conf:

bash

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sudo unlink /etc/resolv.conf

Create a New /etc/resolv.conf File: Manually create the file with your preferred DNS servers:

bash

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sudo nano /etc/resolv.conf

Example content:

plaintext

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nameserver 8.8.8.8

nameserver 1.1.1.1

Prevent systemd-resolved from Recreating the Link: Mask the service if needed:

bash

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sudo systemctl disable --now systemd-resolved

sudo systemctl mask systemd-resolved

Verify the New Configuration: Check that the changes are applied:

bash

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cat /etc/resolv.conf