resolv.conf questions

[Tom H]

On Tue, Aug 6, 2019 at 2:32 PM Eliza <eli at chinabuckets.com> wrote:


> After installing ubuntu-18.04 I found there are the lines in
> /etc/resolv.conf:
>
> nameserver 127.0.0.53
> options edns0
>
> I am not familiar with Linux enough, having questions that:
>
> why does nameserver set up to this address rather than a public DNS such
> as 8.8.8.8?

Ubuntu chose a few versions ago to have a forwarding name server on
its systems. It used to be resolvconf and it's now systemd-resolve.


> How to disable it?

Why?

If you really want to change this, you can edit "/etc/netplan/*" and add

            nameservers:
                nameservers: [8.8.8.8

to, for example,

network:
    version: 2
    renderer: networkd
    ethernets:
        eth0:
            addresses: [192.168.0.111/24]
            gateway4: 192.168.0.1


> what is options edns0?

It enables you to receive extended dns properties if your system can
understand them.