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**flamboyant** · Oct 23, 2017, 07:08 AM

the DNS servers specified in your router don't work:

Originally posted by smog82 View Post

IP4.DNS[1]: 62.241.198.246
IP4.DNS[2]: 62.241.198.245

$ nslookup onet.pl 62.241.198.246
;; connection timed out; no servers could be reached
$ nslookup onet.pl 62.241.198.245
;; connection timed out; no servers could be reached

as soon as you change them you should be fine:

$ nslookup onet.pl 8.8.8.8
Server: 8.8.8.8
Address: 8.8.8.8#53
Non-authoritative answer:
Name: onet.pl
Address: 213.180.141.140

**oshunluvr** · Oct 23, 2017, 12:26 PM

Better yet install and run namebench and find the fastest DNS available to you where you are.

**smog82** · Oct 26, 2017, 11:51 AM

Hello,

Thanks for quick response!

Unfortunately, yours advices didn't solve the problem.

As I wrote in first message, internet connection works well on other devices, So it couldn't be fault of weak dns servers.
But I checked second time.

Code:

nmcli device show              
GENERAL.URZĄDZENIE:                     wlp16s0
GENERAL.TYP:                            wifi
GENERAL.ADRES-SPRZĘTOWY:                00:1F:3B:29:D0:03
GENERAL.MTU:                            0
GENERAL.STAN:                           100 (połączono)
GENERAL.POŁĄCZENIE:                     Multi-Co 9A 17 2.4G
GENERAL.ŚCIEŻKA-POŁĄCZENIA:             /org/freedesktop/NetworkManager/ActiveConnection/2
IP4.ADRES[1]:                           192.168.1.122/24
IP4.BRAMA:                              192.168.1.1
IP4.TRASA[1]:                           dst = 169.254.0.0/16, nh = 0.0.0.0, mt = 1000
IP4.DNS[1]:                             8.8.8.8
IP4.DNS[2]:                             8.8.4.4
IP6.ADRES[1]:                           fe80::c789:2eab:bd34:b1a4/64
IP6.BRAMA:                              

GENERAL.URZĄDZENIE:                     enp0s25
GENERAL.TYP:                            ethernet
GENERAL.ADRES-SPRZĘTOWY:                00:1A:4B:7E:6B:14
GENERAL.MTU:                            1500
GENERAL.STAN:                           20 (niedostępne)
GENERAL.POŁĄCZENIE:                     --
GENERAL.ŚCIEŻKA-POŁĄCZENIA:             --
WIRED-PROPERTIES.OPERATOR:              wyłączone

GENERAL.URZĄDZENIE:                     lo
GENERAL.TYP:                            loopback
GENERAL.ADRES-SPRZĘTOWY:                00:00:00:00:00:00
GENERAL.MTU:                            65536
GENERAL.STAN:                           10 (niezarządzane)
GENERAL.POŁĄCZENIE:                     --
GENERAL.ŚCIEŻKA-POŁĄCZENIA:             --
IP4.ADRES[1]:                           127.0.0.1/8
IP4.BRAMA:                              
IP6.ADRES[1]:                           ::1/128
IP6.BRAMA:

Code:

nslookup onet.pl 8.8.8.8
;; connection timed out; no servers could be reached

nslookup onet.pl 8.8.8.8
;; connection timed out; no servers could be reached

nslookup onet.pl 62.241.198.245
Server:         62.241.198.245
Address:        62.241.198.245#53

Non-authoritative answer:
Name:   onet.pl
Address: 213.180.141.140

I also installed namebench and the results for those dns servers are really good.
So have you got any other ideas?

Kind regards

**GreyGeek** · Oct 26, 2017, 12:17 PM

My resolv.conf in not exactly like yours.

cat /etc/systemd/resolved.conf

# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
#
# Entries in this file show the compile time defaults.
# You can change settings by editing this file.
# Defaults can be restored by simply deleting this file.
#
# See resolved.conf(5) for details

[Resolve]
DNS=systemd-resolved
FallbackDNS=8.8.8.8 8.8.4.4 2001:4860:4860::8888 2001:4860:4860::8844
#Domains=
#LLMNR=yes
DNSSEC=off
#Cache=yes
#DNSStubListener=udp

I have a Hurricane electric IPv6 tunnel setup and IPv6 is my default IP protocol, with a fallback to IPv4 in less than a second.
My Internet connection works great. My 100Mb fiber optic gives me 104Mbps up and 100Mbps down.

**flamboyant** · Oct 27, 2017, 03:30 AM

judging from the output of nslookup and your network settings, you've messed up your system enough to make it unusable. i'd say you reinstall the OS.

**oshunluvr** · Oct 27, 2017, 06:19 AM

I would recommend booting to a liveUSB and checking your connection there before re-installing. If you have done something that is causing this, it will likely work fine from the USB. Then you can review any edits you've made and maybe locate the problem.

IMO, re-installing means you've given up hope of learning anything and are erasing the evidence of what went wrong. Therefore, you are doomed to repeat you mistakes - if there in fact were any.

**oshunluvr** · Oct 27, 2017, 06:24 AM

As far as the issue itself, I've never edited /etc/systemd/resolved.conf to list my nameservers. I edit /etc/resolvconf/resolv.conf.d/tail and let resolvconf build the proper resolv.conf file.

**kc1di** · Oct 27, 2017, 06:35 AM

What is your wireless card and what driver is being used?
if you don't know for sure you can install inxi (in a terminal type

Code:

sudo apt-get install inxi

when that is finished type

Code:

inxi -nn

and post the out put here.

also you may want to run the wireless script in my signature and post the results.
Good luck.

**smog82** · Oct 27, 2017, 03:47 PM

Hi all,

Thanks for suggestions.

I'm not belong to people who changing something for fun, If something works well I don't touch it, I'm not experienced informatician.
If I change something I have to do something to solve the problem.
To solve the problem i tried to do few solutions which I found, in example
https://askubuntu.com/questions/8986...s-with-dnsmasq
But that one and others solutions didn't solve the problem. Next I upgraded the system from 16.04 to current version, also without success.
Then with great distaste I decided to reinstall the system, after few years without any problems.

@kc1di

Code:

inxi -nn
Network:   Card-1: Intel 82566MM Gigabit Network Connection driver: e1000e
         IF: enp0s25 state: down mac: 00:1a:4b:7e:6b:14
         Card-2: Intel PRO/Wireless 4965 AG or AGN [Kedron] Network Connection driver: iwl4965
         IF: wlp16s0 state: up mac: 00:1f:3b:29:d0:03

Due to problems with uploading the wireless script I share it via google drive.
https://drive.google.com/file/d/0B0HoqpL4i_JkYmcwclY1cnVkNmM/view?usp=sharing https://drive.google.com/file/d/0B0H...ew?usp=sharing https://drive.google.com/file/d/0B0HoqpL4i_JkczZKQV9lZjVZY0U/view?usp=sharing

Thanks and kind regards

**kc1di** · Oct 27, 2017, 05:32 PM

Try changing IPV6 from auto to ignored and see if that makes a difference.

**flamboyant** · Oct 28, 2017, 03:00 AM

Originally posted by smog82 View Post

Then with great distaste I decided to reinstall the system, after few years without any problems.

are you saying that now your Internet connection works properly?

**smog82** · Nov 10, 2017, 12:50 PM

Hello

Originally posted by kc1di View Post

Try changing IPV6 from auto to ignored and see if that makes a difference.

I don't know if exactly this changed something but I noticed that an internet works/don't work approximately 50/50 that mean much more often than before but still occasionally.

Originally posted by flamboyant View Post

are you saying that now your Internet connection works properly?

No, I wanted to say that to this annoying problem of internet connection, everything worked well.

**flamboyant** · Nov 11, 2017, 06:25 AM

have you reinstalled your Kubuntu?

**smog82** · Nov 11, 2017, 07:47 AM

Originally posted by flamboyant View Post

have you reinstalled your Kubuntu?

Yes I did. The problem remained.

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