[SOLVED] Permanent Change to DNS (Dynamic Nameserver)

[zaileion]

Before I begin with my issue I have to just voice a bit of disbelief first. Verizon is my carrier because I only have 2 choices for carriers here in the Philly area, You believe that!? 2 carriers in the entire Mid-Atlantic region of the USA. Talk about a monopoly.. Time for a political revolution in this country. Peaceful or otherwise...

OK my issue follows.

I’m trying to make permanent changes to my DNS settings. Verizon is my current default DNS and I want to switch. I’ve tried several different procedures suggested from Google search but my DNS keeps switching back to Verizon after a while. I don’t know if its after a reboot, or browser restart or what the catalyst is for the switch back but it keeps switching back.

Ive tried the following procedures.

Link: http://ubuntuforums.org/showthread.php?t=2078398

Link says to: (I changed gedit to pluma)

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gksudo gedit /etc/resolv.conf

or

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gksudo gedit /etc/resolvconf/resolv.conf.d/head

or

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sudo pluma /etc/network/interfaces

None of them take.

Link: http://unix.stackexchange.com/questions ... untu-14-04

Says to:

I changed vim to pluma

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sudo vim /etc/resolvconf/resolv.conf.d/base

Then:

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$ sudo resolvconf –u
etc/resolvconf/update.d/libc:
Warning: /etc/resolv.conf is not a symbolic link to /etc/resolvconf/run/resolv.conf
$

Still nothing takes permanently.

Ive also tried

Link: http://forum.linuxmint.com/viewtopic.php?f=157&t=139969
Says basically the same procedures as above...

I've also tried the GUI Network Manager thing in the systray but that doesn't work either...

So what is the proper and current procedure to make permanent changes to DNS?

[kukamuumuka]

You need to write-protect the file. An example:
1. Disconnect
2. Run
Mint 13

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sudo nano /etc/resolv.conf

Mint 17

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sudo nano /run/resolvconf/resolv.conf

... the contents

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nameserver 8.8.8.8

... save and quit
Ctrl o
Ctrl x
3. write-protect the file
Mint 13

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sudo chattr +i /etc/resolv.conf

Mint 17

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sudo chattr +i  /run/resolvconf/resolv.conf

4.Connect

[zaileion]

1.
Disable network (I right clicked Network Manager in systray and removed check form Enable Network LMDE2 Mint)

2.
In mate-terminal (click menu and click Terminal)

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sudo nano /etc/resolv.conf

Enter this into file

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nameserver 8.8.8.8

Save and Quit
Ctrl o
Ctrl x

3.
Type below command into the Termional to write protect the file resolv.conf
by

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sudo chattr +i /etc/resolv.conf

My result of the following command:

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$ sudo chattr +i /etc/resolv.conf
chattr: Operation not supported while reading flags on /etc/resolv.conf
$

Any Ideas?

[Laurent85]

Note your current IPv4 settings using nm-tool command in a terminal.

Launch Network Connections tool. Edit your connexion :
- IPV4 Settings tab, select Method Manual
- Add your address, prefix and gateway according to nm-tool settings
- DNS Servers: set IP addresses of your DNS servers of choice, use commas to seperate multiple IP's.
- save
- disconnect network interface, reconnect
- check your new settings using nm-tool command.

[Pjotr]

By coincidence I've had to dig into this matter today myself, because the DNS name server of my internet service provider was down because of a DDOS attack.... As usual, I've written the solution that I've found on my website, both as a reminder for myself and as a help for others.

So, this is how you do it:
https://sites.google.com/site/easylinux ... our-system
(item 11, right column)

That how-to has been written primarily for adding name servers as *reserve*, but the bold text at the end describes the difference in procedure for adding a new name server that should become the *default*.

[zaileion]

Post by Pjotr on Thu Aug 20, 2015 5:57 pm worked for me! Thank You!

[kukamuumuka]

by

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sudo chattr +i /etc/resolv.conf

My result of the following command:

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$ sudo chattr +i /etc/resolv.conf
chattr: Operation not supported while reading flags on /etc/resolv.conf
$

Any Ideas?

In Mint 17 the file is /run/resolvconf/resolv.conf

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sudo chattr +i /run/resolvconf/resolv.conf

[Pjotr]

Post by Pjotr on Thu Aug 20, 2015 5:57 pm worked for me! Thank You!

You're welcome!

Finally a word of caution: the owner of the DNS has the ability to see, log and profile all of your internet traffic! So be careful when you select another DNS.

[altair4]

This is more an anecdotal comment but:

Note your current IPv4 settings using nm-tool command in a terminal.

Launch Network Connections tool. Edit your connexion :
- IPV4 Settings tab, select Method Manual
- Add your address, prefix and gateway according to nm-tool settings
- DNS Servers: set IP addresses of your DNS servers of choice, use commas to seperate multiple IP's.
- save
- disconnect network interface, reconnect
- check your new settings using nm-tool command.

Every time I have had the need to do this I have followed a similar procedure:

DNS-Servers.png

@Laurent85, I'm beginning to think this only works for you and I. Or maybe it's an LMDE thing.

[Laurent85]

Hi @altair4, they all work in different ways as they meet different goals.

To be comprehensive about the different solutions exposed in this thread:
- Your setup adds 2 more DNS servers to nameserver list received from dhcp service. Name resolution queries are forwarded to ALL nameservers.
- Using Pjotr setup, depending on the configuration file used, "head" or "tail", some nameservers serve as backup nameservers if the primary ones are down.
- Using my setup, ONLY specified nameservers are used.

[Pjotr]

- Using Pjotr setup, depending on the configuration file used, "head" or "tail", some nameservers serve as backup nameservers if the primary ones are down.

Yes.... To be fully exact: when added to "tail", a new name server is only a backup for the primary DNS of your internet service provider. When added to "head", a new name server is the primary DNS and the DNS of your internet service provider is the backup.

[altair4]

Hi @altair4, they all work in different ways as they meet different goals.

To be comprehensive about the different solutions exposed in this thread:
- Your setup adds 2 more DNS servers to nameserver list received from dhcp service. Name resolution queries are forwarded to ALL nameservers.
- Using Pjotr setup, depending on the configuration file used, "head" or "tail", some nameservers serve as backup nameservers if the primary ones are down.
- Using my setup, ONLY specified nameservers are used.

altair@vxub1404:~$ nm-tool | grep DNS
DNS: 8.8.8.8
DNS: 8.8.4.4

OR:

altair@vxub1404:~$ nmcli device list | grep IP4.DNS
IP4.DNS[1]: 8.8.8.8
IP4.DNS[2]: 8.8.4.4

Doesn't this mean that my way and your way both replace the DNS servers with new ones and are the only ones used.

[Laurent85]

Doesn't this mean that my way and your way both replace the DNS servers with new ones and are the only ones used.

Oops, you are right. I did not look close enough. I tought "Method Automatic (DHCP)" was used. I did never considered what "Method Automatic (DHCP) addresses only" was used for. I note this one, thanks altair4