networking - Problems with ethernet and wifi - Ask Ubuntu


i'm having problems internet connection ethernet , wifi. have changed office , have internet connection difference new gigabit speed. ethernet , wifi connection randomly disconnected, applet of networkmanager keep connected, ping not working. happen when iddle 1 or 2 minutes, command try uses internet fails.

ping google.cl ping: unknown host google.cl  sudo ifconfig enp2s0    link encap:ethernet  hwaddr 70:8b:cd:05:0a:3f             inet addr:192.168.100.5  bcast:192.168.100.255  mask:255.255.255.0           inet6 addr: fe80::9bc3:d8f5:a9e9:899d/64 scope:link           broadcast running multicast  mtu:1500  metric:1           rx packets:7258 errors:0 dropped:0 overruns:0 frame:0           tx packets:5997 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:1000            rx bytes:4229103 (4.2 mb)  tx bytes:856374 (856.3 kb)

trying using wifi has same effect, think not driver problem r8169 ethernet. there no log in syslog , don't know

some data system:

ubuntu 16.04 kernel 4.4.0-47-generic #68-ubuntu smp wed oct 26 19:39:52 utc 2016 x86_64 x86_64 x86_64 gnu/linux

drivers

kernel driver in use: r8169 (ethernet) kernel driver in use: rtl8723be (wifi)

the problem not internet intermittence, dns intermittence.

when not got google.cl because of dns error issue, done ping 8.8.8.8 google dns check internet link , got response. knew problem related dns.

searching problem, found missing dnsmasq reinstalling problem solved.

i don't understand why default ubuntu 16.04 installation missig dnsmasq.


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