On Mon, 2023-03-27 at 23:09 -0700, ToddAndMargo via users wrote:
> I was looking for a way I could look up the final DNS
> server, regardless of was type of local server I was
> going through. I don't think it is possible. It looks
> like I should dig it out from /etc/named.conf's
> forwards section.
>
> # grep -i forwarders /etc/named.conf | grep -v "#"
> forwarders { 208.67.222.123; 208.67.220.123; };
> forwarders {8.8.8.8; 8.8.4.4; };
I don't know what you mean by "final"? Simply the last one in the list
of your servers? Or you mean upstream, the ones that answered the
queries that your name server asked of it, that you asked of your own
name server?
When you have a series of DNS servers that you can query, the old
behaviour was to always consult the first one on the list. And only
walk down the list when it doesn't respond, until it gets to one that
does. For the next DNS query, it start at the top of the list again,
waiting for the first one to respond, or not, then walk down the list
one by one. And "not responding" really means exactly that. If a
server responds with any answer, even an answer that doesn't have the
requested data, it has responded, and that's the end of your query.
Then there's other behaviours, where the system keeps querying the last
DNS server that has responded (ignoring ones that have failed it
earlier), or it can randomly ask any server in the list.
If you dig a domain name (e.g. dig example.com), the results will tell
you what servers are responsible for its records.
For what it's worth, if you grep /etc/named.conf for forwarders, you
mightn't find what you expect. You can have forwarders that only apply
to certain domain names.
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