resolv.conf questions

[Robert Heller]

At Tue, 6 Aug 2019 20:29:56 +0800 "Ubuntu user technical support,  not for general discussions" <ubuntu-users at lists.ubuntu.com> wrote:

> 
> Hello,
> 
> After installing ubuntu-18.04 I found there are the lines in 
> /etc/resolv.conf:
> 
> nameserver 127.0.0.53
> options edns0

127.0.0.53 points to the "systemd-resolved" process.  The theory is the 
systemd-resolved is a caching DNS (amoungst other things).  systemd-resolved 
is (supposedly) configured to use read nameserers as needed.

man systemd-resolved

for more information and how to configure it.

> 
> 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?
> 
> How to disable it?
> 
> what is options edns0?
> 
> Thanks.
> 
> 

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