It's using a local dnsmasq server for caching, akin to what windoze does,
only it uses an external service and not hidden behind the scenes. You can
remove dnsmasq, usually at least, and resolve direct against your dns
servers, I usually start by removing the package, as I've had enough issues
with it being weird, I tend to not like using it.
I'm presuming 192.168.1.4 and 192.168.1.1 are valid dns servers?
I'm having a weird issue that network manager has a bad dns stuck in it
somewhere that keeps causing me site delays when it'll randomly put it back
into my dns servers list as first. It's not a setting I can find, or
anything in /etc/, I'm thinking something in gconf settings lost, but might
be something similar there if that 192.168.1.4 servers isn't valid.
This might be useful to see what servers dnsmasq is using.
https://askubuntu.com/questions/556852/how-can-i-tell-which-dns-servers-dnsmasq-is-using
-mb
On Fri, Dec 7, 2018 at 7:44 PM Jim <
jim.nantz15@comcast.net> wrote:
> Today I noticed a problem when I use Thunderbird to check my email on my
> Kubuntu 18.04 box. I got the following error in Thunderbird: Failed to
> connect to imap.comcast.net However it will connect to
> imap.comcast.net. I also couldn't ping imap.comcast.net.
>
> delboy@ladmo:~$ ping imap.comcast.net
> ping: imap.comcast.net: Name or service not known
> delboy@ladmo:~$
>
> In Network manager I have the following DNS servers in this order:
> 192.168.1.4 192.168.1.1, 8.8.8.8 8.8.4.4. I found this in /etc/resolv.conf
>
> # Generated by NetworkManager
> nameserver 127.0.0.53
>
> If I change 127.0.0.53 to one of the DNS servers I have in Network
> Manager, Thunderbird works again, but I'm not able to ping
> imap.comcast.net. I get the same error I mentioned earlier. I really
> don't care if I can ping it or not as long as Thunderbird can connect to
> it. However when I reboot or restart Network Manager, resolv.conf goes
> back to 127.0.0.3.
>
> Is there some bug with Network Manager or has comcast manged to screw up
> something?
>
> thanks
>
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