[Dnsmasq-discuss] Local dnsmasq server not utilized by Ubuntu

john doe johndoe65534 at mail.com
Sun Aug 4 20:53:29 BST 2019

On 8/4/2019 9:04 PM, dnsmasqyq.xpt at neverbox.com wrote:
> Hi,
> Thanks a lot for all your replies.
> Sorry I wasn't very clear first as I don't know if anyone would
> read/reply. Here is my reply to you one by one, but at this single
> place.
> On Sun, Aug 4, 2019 at 1:36 PM Daniel Huhardeaux wrote:
>>> Hi,
>>> I know this is not a dnsmasq issue per se, but all my machines are
>>> Ubuntu based and they all can't utilized the local dnsmasq server that
>>> I setup for my LAN, which literally making my local dnsmasq server
>>> useless.
>> systemd-resolve is irrelevant to the OP's question, it provides local
> 'on the machine' DNS caching.  What the OP wants is 'local on his LAN' DNS...
> Sorry I wasn't very clear in my OP -- I've setup my local dnsmasq
> server (DHCP/DNS) correctly. All my Ubuntu machines are picking up IPs
> from my dnsmasq DHCP server. Just they don't use my dnsmasq DNS
> server.
>>> The problem is that the NetworkManager that Ubuntu uses insists to use
>>> its own DNS server, which is, not the DHCP/DNS server I
>>> setup for my LAN.
>> Most likely you are looking at `systemd-resolved`. Consider
> that "local DNS".  It still needs an upstream DNS.
> Yes, I believe so. the is used, and I can confirm that
> whether the `resolvconf` is installed or not. The problem is that,
> `systemd-resolved`'s upstream DNS is suppose to be my LAN dnsmasq
> server (DHCP/DNS), at least I hope so, but it is not somehow, and this
> is the exact problem I'm trying to solve/figure out why.
> Why I say the upstream DNS is not my LAN dnsmasq DNS server? Because
> when I `dig` for my local machine names, including the LAN dnsmasq
> server itself, I get nothing in the `ANSWER SECTION` section, unless I
> manually switch the `nameserver` entry in /etc/resolv.conf in *my
> clients machines* to my LAN dnsmasq server. Then everything works.
>>> I'm wondering how you guys solved such problems, since you are using
>>> dnsmasq server just fine. I had been asking such questions at the
>>> Ubuntu and NetworkManager side multiple times at multiple places, but
>>> have never been able to get a straight/working answer.
>> Hello.
>> It's not a NetworkManager nor an Ubuntu problem: you have
>> systemd-resolve installed on your machine (guess Ubuntu 18.04) which
>> uses as IP for DNS. You have to go in /etc/systemd and adapt
>> the resolved.conf file to put your dnsmasq IP server as DNS.
> Yes, exactly I'm using Ubuntu 18.04, thus systemd-resolve. So,
> How to adapt the resolved.conf file so that my modification survive
> reboot, and not hard-coding anything as when I take my laptop else
> where, I don't want it still pointing to my home LAN dnsmasq server?

Lookat the 'resolvconf' package if it is installed.
Basically, look at the top of /etc/resolv.conf to see what is handeling it.

John Doe

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