(solved) Change DNS setting

[sunrat]

I am trying to set a different DNS server to the default one. I'm connecting via wifi to a modem/router which doesn't allow DNS server setting to be changed. Have tried a few things to no avail:
- nameserver 208.67.222.222 in resolv.conf  This always gets overwritten on restart but I'm not sure by what. resolvconf is not installed
-     nameserver 208.67.222.222 in /etc/network/interfaces.
- prepend domain-name-servers 208.67.222.222 208.67.220.220 in dhclient.conf
- DNS=208.67.222.222 in /etc/systemd/resolved.conf

network-manager is still installed but unused as wifi config is set up in interfaces file. Could this be what is overriding other configs?

[pjnsmb]

have a look at the chattr command



chattr +i /etc/resolv.conf (stop it being overwritten)
chattr -i /etc/resolv.conf   (cancel)


look at man chattr

[sunrat]

Thanks pjnsmb. I did find that workaround in searching and will try it as a last resort. I'd still like to know what is overwriting interfaces file.

[melmarker]

using chattr in that case is the same as killing your wife because she is a bad cook - better would be in case a) if using resolvconf with n-m setting up the networkmanager/resolvconf right - same as without resolvconf. b) help her learn cooking.

[piper]

Not to say to use google dns, but, a good example, guideline

https://developers.google.com/speed/public-dns/docs/using

[sunrat]

Thanks for the replies but I'm not using network-manager or resolvconf. This is a desktop system always using the same wifi and connection is set in /etc/network/interfaces. I'm trying to use OpenDNS and it's not configurable in the router.
Would removing/purging network-manager help or could this have unintended consequences?
I don't have a wife either so can't kill her.

[melmarker]

Please post the status of network-manager - and yes, one can purge n-m (ceni and ifupdown and wpa-supplicant are sufficient)

[sunrat]

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roger@siduction-brain:~$ nmcli d
Error: NetworkManager is not running.

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roger@siduction-brain:~$ systemctl list-units |grep network
networking.service                                                                                         loaded active exited    Raise network interfaces                                                         
vnstat.service                                                                                             loaded active running   vnStat network traffic monitor                                                   
network-online.target                                                                                      loaded active active    Network is Online                                                               
network.target                                                                                    loaded active active    Network 

[piper]

Does this work for you with the problem of 'overwritten on restart' , I don't use sudo, so ...

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nano /etc/dhcp/dhclient.conf

Add the following line to the document before the 'require subnet-mask' command

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supersede domain-name-servers 208.67.222.222,208.67.220.220;

save and exit

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ifdown eth0 && sudo ifup eth0

You 'might'  be required to change eth0 to your own network device's name if it uses 'Predictable Network Interface Names'.

[sunrat]

I tried "prepend" in that file to no avail. Will try that tonight (in about 8 hours here).

I'm using dig to show the DNS used, hopefully that is correct:

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$ dig google.com |grep SERVER
;; SERVER: 192.168.0.1#53(192.168.0.1)

[sunrat]

Thanks piper, looks like the "supersede" line worked. 

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dig google.com |grep SERVER
;; SERVER: 208.67.222.222#53(208.67.222.222)

[piper]

Good deal sunrat