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With my ubuntu 16.04, my /etc/resolv.conf change every system start 

cat /etc/resolv.conf  
nameserver 127.0.0.1

Network-manager have the correct dns name server 192.168.1.1
I removed bind9 and all related packages.
No special config on rc folders nor rc.local
No dns-nameserver options with /etc/network/interfaces.

I missed something? What app can change this file automatically?

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  • Do you use DHCP?
    – HBruijn
    Apr 6, 2017 at 11:45
  • Perhaps this could answer your question: askubuntu.com/questions/627899/…
    – chloesoe
    Apr 6, 2017 at 11:46
  • Yes I use DHCP Thanks, the solution is to comment #dns=dnsmask from network-manager.conf
    – M. BY
    Apr 11, 2017 at 14:26

3 Answers 3

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I can't remember when this started, but resolv.conf is a system generated file.

Anything (more specifically, static options from previous resolv.conf's) that you want adding to that should be put in /etc/resolvconf/resolv.conf.d/base.

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Make sure resolvconf service is running, enable it:

sudo systemctl start resolvconf.service

then enter this one:

sudo nano /etc/resolvconf/resolv.conf.d/head

then add/change the nameservers you want and save, and then modify the resolv.conf and close.

remember to set your network-manager dns to what you've set in resolv.conf

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Do you use DHCP?

  • Does maybe your DHCP server send wrong nameserver pointers?
  • Do you have a custom dhcp.conf that uses it's own nameserver config and ignores the DHCP server?

If you don't use DHCP:

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  • Thank you, I am using network-manager (iface wlan with dhcp) But when displaying dns with network-manager show interface informations: the correct ones are showing.
    – M. BY
    Apr 6, 2017 at 13:36

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