Cannot ping by host name [duplicate]

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  • “ping: unknown host google.com” but IPs works fine [duplicate]

    4 answers



  • How do I fix DNS resolving which doesn't work after upgrading to Ubuntu 13.10 (Saucy)

    4 answers



I have a strange situation. Pinging by ip works fine, but by host name fails.
My observations:



nslookup -type=ns google.com
;; connection timed out; no servers could be reached


In one window I called:



ping google.com
ping: unknown host google.com


and in the other window I had this:



sudo tcpdump -n -i eno1 |grep -A5 172.27.1.100.53 # this is my dns server
11:06:57.336938 IP 172.27.6.77.48852 > 172.27.1.100.53: 61526+ A? google.com. (28)
11:06:57.337151 IP 172.27.1.100.53 > 172.27.6.77.48852: 61526 1/0/0 A 172.217.12.110 (44)
11:06:57.337170 IP 172.27.6.77 > 172.27.1.100: ICMP 172.27.6.77 udp port 48852 unreachable, length 80


As you can see in the tcpdump there was a response from DNS server and google.com was properly resolved: 172.217.12.110.



What's going on here? Can I somehow debug it more?



I know that when I restart my network it would work fine, because it happened few times earlier. This is only workaround and it doesn't resolve my isssue.



I am using ubuntu 16.04 (desktop).



Thanks.






networking dns hostname tcpdump







share|improve this question













marked as duplicate by karel, Fabby, David Foerster, George Udosen, Eric Carvalho Apr 20 at 19:25


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.














  • Can you change your nameserver to 8.8.8.8 in /etc/resolv.conf ?
    – ponsfrilus
    Apr 18 at 12:08










  • Thanks guys for suggestions. I have disabled dnsmasq (so it caused change of /etc/resolv.conf) and now it looks it works.
    – dePablo
    Apr 20 at 9:20














up vote
0
down vote

favorite













This question already has an answer here:



  • “ping: unknown host google.com” but IPs works fine [duplicate]

    4 answers



  • How do I fix DNS resolving which doesn't work after upgrading to Ubuntu 13.10 (Saucy)

    4 answers



I have a strange situation. Pinging by ip works fine, but by host name fails.
My observations:



nslookup -type=ns google.com
;; connection timed out; no servers could be reached


In one window I called:



ping google.com
ping: unknown host google.com


and in the other window I had this:



sudo tcpdump -n -i eno1 |grep -A5 172.27.1.100.53 # this is my dns server
11:06:57.336938 IP 172.27.6.77.48852 > 172.27.1.100.53: 61526+ A? google.com. (28)
11:06:57.337151 IP 172.27.1.100.53 > 172.27.6.77.48852: 61526 1/0/0 A 172.217.12.110 (44)
11:06:57.337170 IP 172.27.6.77 > 172.27.1.100: ICMP 172.27.6.77 udp port 48852 unreachable, length 80


As you can see in the tcpdump there was a response from DNS server and google.com was properly resolved: 172.217.12.110.



What's going on here? Can I somehow debug it more?



I know that when I restart my network it would work fine, because it happened few times earlier. This is only workaround and it doesn't resolve my isssue.



I am using ubuntu 16.04 (desktop).



Thanks.






networking dns hostname tcpdump







share|improve this question













marked as duplicate by karel, Fabby, David Foerster, George Udosen, Eric Carvalho Apr 20 at 19:25


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.














  • Can you change your nameserver to 8.8.8.8 in /etc/resolv.conf ?
    – ponsfrilus
    Apr 18 at 12:08










  • Thanks guys for suggestions. I have disabled dnsmasq (so it caused change of /etc/resolv.conf) and now it looks it works.
    – dePablo
    Apr 20 at 9:20












up vote
0
down vote

favorite









up vote
0
down vote

favorite












This question already has an answer here:



  • “ping: unknown host google.com” but IPs works fine [duplicate]

    4 answers



  • How do I fix DNS resolving which doesn't work after upgrading to Ubuntu 13.10 (Saucy)

    4 answers



I have a strange situation. Pinging by ip works fine, but by host name fails.
My observations:



nslookup -type=ns google.com
;; connection timed out; no servers could be reached


In one window I called:



ping google.com
ping: unknown host google.com


and in the other window I had this:



sudo tcpdump -n -i eno1 |grep -A5 172.27.1.100.53 # this is my dns server
11:06:57.336938 IP 172.27.6.77.48852 > 172.27.1.100.53: 61526+ A? google.com. (28)
11:06:57.337151 IP 172.27.1.100.53 > 172.27.6.77.48852: 61526 1/0/0 A 172.217.12.110 (44)
11:06:57.337170 IP 172.27.6.77 > 172.27.1.100: ICMP 172.27.6.77 udp port 48852 unreachable, length 80


As you can see in the tcpdump there was a response from DNS server and google.com was properly resolved: 172.217.12.110.



What's going on here? Can I somehow debug it more?



I know that when I restart my network it would work fine, because it happened few times earlier. This is only workaround and it doesn't resolve my isssue.



I am using ubuntu 16.04 (desktop).



Thanks.






networking dns hostname tcpdump







share|improve this question














This question already has an answer here:



  • “ping: unknown host google.com” but IPs works fine [duplicate]

    4 answers



  • How do I fix DNS resolving which doesn't work after upgrading to Ubuntu 13.10 (Saucy)

    4 answers



I have a strange situation. Pinging by ip works fine, but by host name fails.
My observations:



nslookup -type=ns google.com
;; connection timed out; no servers could be reached


In one window I called:



ping google.com
ping: unknown host google.com


and in the other window I had this:



sudo tcpdump -n -i eno1 |grep -A5 172.27.1.100.53 # this is my dns server
11:06:57.336938 IP 172.27.6.77.48852 > 172.27.1.100.53: 61526+ A? google.com. (28)
11:06:57.337151 IP 172.27.1.100.53 > 172.27.6.77.48852: 61526 1/0/0 A 172.217.12.110 (44)
11:06:57.337170 IP 172.27.6.77 > 172.27.1.100: ICMP 172.27.6.77 udp port 48852 unreachable, length 80


As you can see in the tcpdump there was a response from DNS server and google.com was properly resolved: 172.217.12.110.



What's going on here? Can I somehow debug it more?



I know that when I restart my network it would work fine, because it happened few times earlier. This is only workaround and it doesn't resolve my isssue.



I am using ubuntu 16.04 (desktop).



Thanks.





This question already has an answer here:



  • “ping: unknown host google.com” but IPs works fine [duplicate]

    4 answers



  • How do I fix DNS resolving which doesn't work after upgrading to Ubuntu 13.10 (Saucy)

    4 answers






networking dns hostname tcpdump




networking dns hostname tcpdump






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Apr 18 at 9:22









dePablo

11




11




marked as duplicate by karel, Fabby, David Foerster, George Udosen, Eric Carvalho Apr 20 at 19:25


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.






marked as duplicate by karel, Fabby, David Foerster, George Udosen, Eric Carvalho Apr 20 at 19:25


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.













  • Can you change your nameserver to 8.8.8.8 in /etc/resolv.conf ?
    – ponsfrilus
    Apr 18 at 12:08










  • Thanks guys for suggestions. I have disabled dnsmasq (so it caused change of /etc/resolv.conf) and now it looks it works.
    – dePablo
    Apr 20 at 9:20
















  • Can you change your nameserver to 8.8.8.8 in /etc/resolv.conf ?
    – ponsfrilus
    Apr 18 at 12:08










  • Thanks guys for suggestions. I have disabled dnsmasq (so it caused change of /etc/resolv.conf) and now it looks it works.
    – dePablo
    Apr 20 at 9:20















Can you change your nameserver to 8.8.8.8 in /etc/resolv.conf ?
– ponsfrilus
Apr 18 at 12:08




Can you change your nameserver to 8.8.8.8 in /etc/resolv.conf ?
– ponsfrilus
Apr 18 at 12:08












Thanks guys for suggestions. I have disabled dnsmasq (so it caused change of /etc/resolv.conf) and now it looks it works.
– dePablo
Apr 20 at 9:20




Thanks guys for suggestions. I have disabled dnsmasq (so it caused change of /etc/resolv.conf) and now it looks it works.
– dePablo
Apr 20 at 9:20










1 Answer
1






active

oldest

votes

















up vote
0
down vote



accepted










I looked into these issues:
nameserver 127.0.1.1 in resolv.conf won't go away!
How do I fix DNS resolving which doesn't work after upgrading to Ubuntu 13.10 (Saucy)
and made a trick with disabling line "dns=dnsmasq" in /etc/NetworkManager/NetworkManager.conf .



It looks this solves my issue.






share|improve this answer



























    1 Answer
    1






    active

    oldest

    votes








    1 Answer
    1






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes








    up vote
    0
    down vote



    accepted










    I looked into these issues:
    nameserver 127.0.1.1 in resolv.conf won't go away!
    How do I fix DNS resolving which doesn't work after upgrading to Ubuntu 13.10 (Saucy)
    and made a trick with disabling line "dns=dnsmasq" in /etc/NetworkManager/NetworkManager.conf .



    It looks this solves my issue.






    share|improve this answer
























      up vote
      0
      down vote



      accepted










      I looked into these issues:
      nameserver 127.0.1.1 in resolv.conf won't go away!
      How do I fix DNS resolving which doesn't work after upgrading to Ubuntu 13.10 (Saucy)
      and made a trick with disabling line "dns=dnsmasq" in /etc/NetworkManager/NetworkManager.conf .



      It looks this solves my issue.






      share|improve this answer






















        up vote
        0
        down vote



        accepted







        up vote
        0
        down vote



        accepted






        I looked into these issues:
        nameserver 127.0.1.1 in resolv.conf won't go away!
        How do I fix DNS resolving which doesn't work after upgrading to Ubuntu 13.10 (Saucy)
        and made a trick with disabling line "dns=dnsmasq" in /etc/NetworkManager/NetworkManager.conf .



        It looks this solves my issue.






        share|improve this answer












        I looked into these issues:
        nameserver 127.0.1.1 in resolv.conf won't go away!
        How do I fix DNS resolving which doesn't work after upgrading to Ubuntu 13.10 (Saucy)
        and made a trick with disabling line "dns=dnsmasq" in /etc/NetworkManager/NetworkManager.conf .



        It looks this solves my issue.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Apr 20 at 9:18









        dePablo

        11




        11












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