> On 28 Mar 2023, at 07:10, ToddAndMargo via users <users@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> On 3/27/23 21:22, Tim via users wrote:
>> Tim:
>>>> Are you on-line?
>>>>
>>>> And did any of the other options work?
>> ToddAndMargo:
>>> No. And I am also not running sysyemd-resolved
>> Perhaps we should go back to the start, your question is itself a bit
>> odd. DNS means Domain Name System, but we all presume you want to know
>> the address of your Domain Name Server.
>> When a device joins a network it is typical that a DHCP server assigns
>> it an addresses (numerical IP, hostname, domain name), and provides
>> some other addresses (gateway IP, nameserver(s), subnet mask). The
>> DHCP server need properly configuring to provide that info. Your
>> device will glean that info, and use it, even if you are running your
>> own name server.
>> And one would expect that all of that gets cancelled when disconnecting
>> (not that people often cleanly disconnect, as opposed to just losing
>> connection).
>> Failing that, without a DHCP server, variously named auto-config
>> schemes can take place (Bonjour, ZeroConf, etc) which do a similar
>> task. This time, the device, itself, self sets several of those
>> parameters, but not in a way that can communicate outside of the
>> network. It'll pick a random IP address from within a local-only
>> range, it'll broadcast hostname queries waiting for an answer from
>> anyone.
>> Failing that, you hand set your network configuration.
>> Normally, when you connect up to your ISP their DHCP server assigns you
>> all that networking info. Some don't, some expect you to set some
>> things, though that's an older way of doing things. And some just fail
>> badly. If you want to know your ISP's DNS servers to put into your
>> network configuration, or into your name daemon's forwarder IPs, you
>> could try:
>> a) Connecting via DHCP and copying the details
>> b) Asking them what the DNS server IPs are
>> c) Googling them
>> Bearing in mind that an ISP's DNS servers may change, at any time, they
>> may expect you to use DHCP to keep them current.
>> If there's a router between your ISP and your device, *it* will have
>> your ISP's DNS IPs in it, as your ISP's DHCP server will have
>> configured it, and you can copy them. And *it* will probably act as
>> your DHCP server for the rest of your network. You may be able to
>> customise its DHCP settings to suit your LAN. That router will act as
>> your DNS server, or simply pass queries through. You can use that
>> router's IP as your DNS forwarder IP.
>> You may not need to use your ISP's DNS servers, you could simply use
>> Goggle's, or some other public DNS server (there are various public
>> ones, with and without censoring). This may actually be better for you
>> than your ISP's. The only gotcha is that some ISPs will give a
>> different answer to their mailserver's IP to their own clients than to
>> the rest of the world.
>
> 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.
To lookup a name can involves a lot of dns servers,
not sure how many is typical but is likely 3 or more until cached answers exist.
What do you mean by final dns server?
Barry
> 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; };
>
> And it looks like I have to be root to read /etc/named.conf,
> so never mind.
>
>
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