Internet not working properly

[cezar.suteu@gmail.com]

If I connect the pine64 by Ethernet cable, the internet works properly and the contents of the resolv.conf are
domain home
search home
nameserver 192.168.0.1

If I don't connect the pine64 by cable & only use the wifi board, the internet doesn't work and the contents of the resolv.conf are
# Generated by NetworkManager
search home
nameserver 192.168.0.1
nameserver 2a02:908:2:a::1
nameserver 2a02:908:2:b::1

If I try to replace the /etc/resolv.conf with the "ethernet-only" one, it still doesn't work. If I try to make sudo service network-manager restart , the /etc/resolv.conf is regenerated.

So it seems that the network manager is adding the ipv6 nameservers which don't work properly. I checked in the other computers and the /etc/resolv.conf only have standard ipv4 nameservers (again, with standard DHCP settings).

Any ideas?