resolv.conf problem

[Jim]

The link you provided put me on the right track.  At this url there are 
three answers to the question how to disable systemd-resolved in Ubuntu 
17.04.  The first answer says it also works for Ubuntu 18.04.  The 
instructions in the first answer fixed the problem for me.

https://askubuntu.com/questions/907246/how-to-disable-systemd-resolved-in-ubuntu

Thanks to everyone who replied.


On 12/7/18 10:21 PM, Michael Butash wrote:
> 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 at comcast.net 
> <mailto:jim.nantz15 at 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 <http://imap.comcast.net> However it
>     will connect to
>     imap.comcast.net <http://imap.comcast.net>. I also couldn't ping
>     imap.comcast.net <http://imap.comcast.net>.
>
>     delboy at ladmo:~$ ping imap.comcast.net <http://imap.comcast.net>
>     ping: imap.comcast.net <http://imap.comcast.net>: Name or service
>     not known
>     delboy at 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 <http://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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