Linux change dns name

how to change DNS server permanently on Ubuntu 20.04?

I know there are other posts here asking this, but those suggestions do not help, the configuration keeps changing and I simply cannot get my own changes to persist. I have the Google 8.8.8.8 and 8.8.4.4 servers in my Network Manager configuration in the GUI, and systemd-resolv —status returns

Link 2 (enp38s0f1) Current Scopes: DNS DefaultRoute setting: yes LLMNR setting: yes MulticastDNS setting: no DNSOverTLS setting: no DNSSEC setting: no DNSSEC supported: no Current DNS Server: 8.8.8.8 DNS Servers: 8.8.8.8 8.8.4.4 DNS Domain: ~. 

;; Query time: 0 msec ;; SERVER: 192.168.1.1#53(192.168.1.1) ;; WHEN: Mon Oct 05 11:08:26 EDT 2020 ;; MSG SIZE rcvd: 83 

so my default route 192.168.1.1 as DNS . Furthermore, /etc/resolv.conf is a symlink to /run/systemd/resolve/resolv.conf , which in turn reads

# Generated by dhcpcd from enp38s0f1.dhcp, wlp0s20f3.dhcp # /etc/resolv.conf.head can replace this line domain fios-router.home nameserver 192.168.1.1 # /etc/resolv.conf.tail can replace this line 

The only enp38s0f1.dhcp file on this system (I’ve searched / ) is /run/dhcpcd/resolv.conf/enp38s0f1.dhcp , which reads

# Generated by dhcpcd from enp38s0f1.dhcp domain fios-router.home search fios-router.home nameserver 192.168.1.1 

I have tried to write in other nameservers there, but they do not persist. In the past I’ve made the changes persistent by making the file immutable with chattr +i , but

lsattr /run/dhcpcd/resolv.conf/enp38s0f1.dhcp 

lsattr: Inappropriate ioctl for device While reading flags on /run/dhcpcd/resolv.conf/enp38s0f1.dhcp 

so that attribute is not available here. And besides, I shouldn’t have to make the file immutable anyway: there should presumably be some way I can control the DNS server.. Edit: In response to comments below:

$ dpkg -l *dnsmasq* --- Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad) ||/ Name Version Architecture Description +++-================-===============-============-============================================ un dnsmasq  (no description available) ii dnsmasq-base 2.80-1.1ubuntu1 amd64 Small caching DNS proxy and DHCP/TFTP server un dnsmasq-base-lua  (no description available) 

Источник

How do I configure my DNS settings in Ubuntu server?

According to this page it appears to be simple. However, /etc/bind does not exist on the default installation of Ubuntu 12.04.3 LTS server. So, without installing any further software, how can configure DNS and remove dnsmasq on ubuntu server? I am quite familiar with sudo & nano .

Also take a look at help.ubuntu.com/community/Dnsmasq. bind IS a nameserver. If you need nameserver functionality on your server, you must install a nameserver. It would help if you could describe what it is you are trying to achieve.

You were reading a manual to configure a DNS Server, not how to configure the DNS entries in the server. The manual you should have read are this

I don’t have the rep to post a comment on another answer, but in reply to Nullet’s answer on September 17th 2013, this worked for me. I was thinking that there was a problem with my router (a cheap, ISP provided one). I also think it worth mentioning that on the dns-nameservers line, you should use the IP of the public DNS. Don’t use the local address of the DNS, which is most likely on your router. I was connecting to the DNS on my router, which for some unknown reason wasn’t working with my server. Instead, I found out where the DNS on my router was getting its information from, and set dn

I think there is a better answer here unix.stackexchange.com/a/154538/82018 — basically you can override your dhcp settings to «prepend» a server in front of the ones you currently use. This is nice as you don’t have to rely solely on the new server, you just give it precedence for lookups.

Источник

How to set DNS Nameserver on Ubuntu 20.04

The Domain Name System (DNS) translates text-based domain names to numeric IP addresses. By default, most networks are configured to work with DNS servers supplied by the internet service provider. However, users are free to change the DNS nameservers.

This tutorial will show you how to change DNS nameservers on your Ubuntu machine using GUI or the command line.

• Ubuntu 20.04 (both methods also work on Ubuntu 18.04 and later)
• Access to the terminal
• Sudo privileges

Change DNS Nameserver via GUI

Use Ubuntu Settings to complete all the steps to change DNS addresses via the graphical user interface.

1. Launch Settings and click the Network tab in the menu on the left.

2. Click the cogwheel next to the connection you wish to set up.

Note: To change the settings for a wireless connection, select the Wi-Fi tab, choose a wireless network and proceed with the steps below.

3. Go to the IPv4 tab.

4. Disable automatic DNS configuration by turning off the switch next to the DNS field.

5. Type new DNS addresses in the field. The example shows Google’s public DNS nameservers.

6. Click Apply.

The system is now configured to work with the new DNS servers.

Note: If you wish to set up IPv6 nameservers, go to the IPv6 tab and enter them there. The IPv6 address format is different from IPv4. For example, Google’s IPv6 DNS servers are: 2001:4860:4860::8888 and 2001:4860:4860::8844 .

Change DNS Nameserver via Config File

If you do not use a GUI, change DNS settings with the command line Netplan tool.

1. Go to the Netplan directory:

2. List the directory contents with ls to see the name of the yaml file containing network configuration.

Open the file in a text editor. Your file may have a different name.

sudo nano 01-network-manager.yaml

Ethernet connections are listed in the ethernets section of the file. If there are any wireless connections, you can find them in the wifis section. Netplan stores the current DNS configuration parameters in nameservers subsections of each section.

Replace the addresses located in the file with the DNS addresses you want to use. You can enter more than two addresses. Save the changes and exit.

Note: The file on your system may lack the entire ethernets or wifis section. In that case, add the lines that are missing, making sure you respect the indentation provided in the example.

3. Apply the changes you made in the config file:

If the operation is successful, there is no output. To check if the system successfully applied the changes, type:

resolvectl status | grep "DNS Server" -A2

The output lists your current DNS servers:

Why Change DNS Nameserver on Ubuntu?

In most cases, your default DNS settings offer optimal performance. However, there are scenarios in which you should consider switching to a third-party DNS provider:

• Large companies with better infrastructure are usually more capable of providing uninterrupted DNS service. If your ISP is unreliable and you experience frequent downtimes, switching the DNS provider may be the solution.
• Third-party DNS servers can be faster than those provided to you by your ISP.

Note: Since latency is the primary consideration for DNS, a fast third-party server located far away may provide inferior service to a slower one that is closer to you.

• Some DNS providers offer filters that prevent phishing sites from reaching your computer. The same mechanism is also used to block sensitive content on the internet. Businesses often employ this DNS feature.
• Internet Service Providers sometimes block content on the DNS level, so switching to another DNS nameserver may help you access some geo-restricted websites.

Note: Learn how to install PowerDNS on Ubuntu, a flexible and robust DNS solution.

This tutorial showed you how to set your DNS nameservers on Ubuntu, either using a GUI or CLI.

Источник

How to Change DNS on Linux [Step by Step Guide]?

In DNS (Domain Name System), domain names are associated with the IP addresses. The purpose of DNS on Linux is to provide a way for users and applications to access network resources using human-friendly domain names. Additionally, you can modify the system’s network configuration file by changing the DNS servers on Linux, which enhances the security and privacy of a system.

This article will demonstrate the step-by-step instructions to change DNS on Linux with the following content:

Method 1: How to Change DNS on Linux Using CLI?

DNS is typically implemented on Linux using a combination of software, such as the BIND (Berkeley Internet Name Domain) server and the local DNS resolver, typically provided by the “libc” library.

Step 1: Access and Configure the resolv.conf File

After opening the terminal on a Linux machine, specify the “resolv.conf” file to access the configuration file. It allows users to change the DNS in the nano text editor:

It navigates to the specified configuration file. Look for the line that starts with “nameserver” and replaces the current IP address with the new DNS server IP address and gateway as “127.0.0.53” and “127.0.10.53”.

After configuration, save (CTRL+S) and exit the editor(CTRL+X).

Step 2: Restart the Network Manager

To restart the network manager, the “systemctl” command is used in the following manner:

$ sudo systemctl restart NetworkManager

Step 3: Verify Ping Domain Name

Users can verify the services of DNS by pinging to the specific domain. In our case, the “Google.com” domain name is used to check the DNS services:

The output shows that 3 packets have been transmitted and received by the system.

Method 2: How to Change DNS on Linux Using GUI?

Linux offers the GUI method to change the DNS IP address more easily. The step-by-step procedure to change the DNS on Linux is provided below:

Step 1: Open the Network Manager

To open the Network Manager, click on the network icon in the system tray or by searching for “Network” in the application launcher:

Step 2: Change the DNS Settings

It navigates to the “Network Settings”. In this way, click on the gear icon next to the network connection you want to change the DNS settings for.

Choose the “IPv4” section for modifying the DNS settings. In the “Automatic (DHCP)” settings, hit on the “DNS” text field and type the IP address. In our case, “8.8.8.8” and “8.8.4.4” IP addresses are entered here. Finally, hit the “Apply” button:

The DNS server IP addresses have been set on Linux.

Conclusion

Linux offers the CLI and GUI methods to change the DNS on Linux. In CLI, change the DNS server IP address after accessing the “/etc/resolv.conf” file. In GUI, users can easily set the DNS server IP address in the “IPv4” tab of Network Settings. This article has explained step-by-step instructions to change the DNS on Linux.

Источник