On 8/24/17 8:40 AM, [email protected] wrote: > Folks, > I thought I had my Mikrotik router setup right, indeed it was doing just > fine, I did > an upgrade on it and all of a sudden my linux boxes no longer keep the DNS > When I first reboot the router it appears to tell everyone about DNS, I can > set > for a while on my Linux boxen and go everywhere, then all of a sudden each > one of them no longer resolves, interesting thing is the Android devices DO > continue to resolve just fine. > > Anyone seen that one. I am running Mate on Ubuntu 16.04 all machines are up > to date as far as I know. Here's how I'd go about troubleshooting this.
When your Linux boxen can't get dns name resolution do the following. 1. Go to cli and run the command "cat /etc/resolv.conf" e.g. cat /etc/resolv.conf # Generated by NetworkManager nameserver 8.8.8.8 nameserver 8.8.4.4 2. Is the nameserver ip addr the same ip addr of the microtik router? If no, there's most likely a config problem. 3. If yes, ping the ip addr of the nameserver 4. If it doesn't respond, there's a network communication issue between the two devices. 5. If it does respond, run the command, "nslookup google.com". Does the command provide a non-authoritative answer? e.g. nslookup google.com Server: 8.8.8.8 Address: 8.8.8.8#53 Non-authoritative answer: Name: google.com Address: 216.58.193.78 6. If no, login in to the Microtik and run the same command. 7. If the Microtik replies with a non-authoritative answer I'd take a look at this thread about dnsmasq. https://askubuntu.com/questions/131342/dnsmasq-sometimes-resolves-things-sometimes-it-doesnt That should be a good start in running down this problem. _______________________________________________ PLUG mailing list [email protected] http://lists.pdxlinux.org/mailman/listinfo/plug
