[Dnsmasq-discuss] [solved] Re: Finding actual DNS server used

[Beniamino Galvani]

On Mon, Jan 16, 2017 at 08:36:05AM +0200, Lars Noodén wrote:
> Thanks. That's it.  I somehow missed it there in the manual page:
> 
> 	When it receives a SIGUSR1, dnsmasq writes  statistics
> 	to  the  system log.  … For each upstream server
> 	it  gives  the  number  of  queries sent, and the
> 	number which resulted in an error.
> 	…
> 
> That gives me the information I was looking for regarding verifying
> which server dnsmasq is using.

Hi,

in addition to the suggested methods, an alternative way is to grep
system logs for:

 dnsmasq[6620]: setting upstream servers from DBus
 dnsmasq[6620]: using nameserver 192.168.10.1#53(via ens3)

In the next version of NetworkManager (1.6) it will be possible to
show the DNS configuration in the output of 'nmcli' [1], as:

 $ nmcli
 ens3: connected to internet+
        "Realtek RTL-8100/8101L/8139 PCI Fast Ethernet Adapter (QEMU Virtual Machine)"
        ethernet (8139cp), 52:54:00:F1:61:81, hw, mtu 1500
        ip4 default
        inet4 192.168.10.166/24
 [...]
 DNS configuration:
        servers: 10.0.0.1
        domains: foobar.com
        interface: tun0
        type: vpn

        servers: 192.168.10.1
        interface: ens3

Beniamino

[1] https://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=20bf5ce35907e2a59fd1f1f9595b8eb202facc0f