16.04 wifi was operating normally until the home router was overhauled today. Wifi service was restored and the OSX / IOS wifi devices are running well. The 16.04 wifi is able to ping the gateway:
$ ping -c 3 192.168.8.1
however replacing the gateway ip with yahoo.com returns:
$ ping -c 3 192.168.8.1
ping: unknown host yahoo.com
yahoo.com resolved to 72.30.35.9 and pinging 72.30.35.9 was successful: this leads me to believe there is a DNS failure. Router provides DHCP service
Interesting observations:
- The OSX box does not suffer said DNS failures.
- 16.04 wifi works perfectly with cellular wifi hotspot
Question
What tests can be performed to confirm the problem and determine corrective action?
UPDATES
DNS-based Filtering was turned off in the router and the problem is now resolved.
Per Stephen Boston:
$ cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.1.1
Per Stephen Boston:
ls -l /etc/resolv.conf
lrwxrwxrwx 1 root root 29 Nov 13 2018 /etc/resolv.conf -> ../run/resolvconf/resolv.conf
Flushing DNS Cache did not resolve issue:
$ sudo /etc/init.d/networking restart
[sudo] password for user:
[ ok ] Restarting networking (via systemctl): networking.service.
