Skip to content

Introduction

For novice users who are new to GNU/Linux for the first time, the first thing to consider is how to connect the machine to the Internet after installing the operating system. This article will tell you how to configure the IP address, subnet mask, gateway and DNS. There are several ways for reference. Whether you are a novice or a familiar, I believe you can quickly get started.

nmtui

NetworkManager is a standard Linux network configuration tool suite, which supports server and desktop environments. Nowadays, most popular distributions support it. This set of network configuration tools is suitable for Rocky Linux 8 and later versions. If you want to configure network information graphically (i.e. the command line nmtui ), you only need to do this:

shell > dnf -y install NetworkManager NetworkManager-tui
shell > nmtui
NetworkManager TUI
Edit a connection
Activate a connection
Set system hostname
Quit
\<OK>

You can use the Tab key or the key to select the specific If you want to change the network information, please select Edit a connection and then Enter. Select a different network card and select Edit.. to edit.

DHCP IPv4

For IPv4, if it is to obtain network information using DHCP way, you only need to select IPv4 CONFIGURATION back <Automatic> , and then run your terminal under systemctl restart NetworkManager.service , large In most cases, it can take effect. In rare cases, you need to switch the network card to take effect. For example, this way- nmcli connection down ens33 , nmcli connection up ens33

Manually fix network information

If you want to manually fix all IPv4 network information, you need to select <Manual> after IPv4 CONFIGURATION and add it line by line. For example, I like this:

Item Value
Addresses 192.168.100.4/24
Gateway 192.168.100.1
DNS servers 8.8.8.8

Then click \< OK > , return to the terminal interface step by step, and execute systemctl restart NetworkManager.service. Similarly, in rare cases, the network card needs to be switched on and off to take effect.

Change the way of configuration files

All RHEL distributions, whether upstream or downstream, are configured in the same way. The configuration file of network information is stored in the /etc/sysconfig/network-scripts/ directory, and one network card corresponds to one configuration file. The configuration file has many parameters, as shown in the following table. Notice! The parameters must be capitalized.

shell > ls /etc/sysconfig/network-scripts/
ifcfg-ens33
Parameter name Meaning Example
DEVICE System logical device name DEVICE=ens33
ONBOOT Whether the network card starts automatically with the system, you can choose yes or no ONBOOT=yes
TYPE Network card interface type, usually Ethernet TYPE=Ethernet
BOOTPROTO The way to obtain ip, it can be DHCP dynamic acquisition, or static manual configuration using static BOOTPROTO=static
IPADDR The ip address of the network card, when BOOTPROTO=static, this parameter will take effect IPADDR=192.168.100.4
HWADDR Hardware address, ie MAC address HWADDR=00:0C:29:84:F6:9C
NETMASK Decimal subnet mask NETMASK=255.255.255.0
PREFIX Subnet mask, represented by numbers PREFIX=24
GATEWAY Gateway, if there are multiple network cards, this parameter can only appear once GATEWAY=192.168.100.1
PEERDNS When it is yes, the DNS parameters defined here will modify /etc/resolv.conf; when it is no, /etc/resolv.conf will not be modified. When using DHCP, the default is yes PEERDNS=yes
DNS1 The primary DNS is selected, it takes effect only when PEERDNS=no DNS1=8.8.8.8
DNS2 Alternative DNS, only effective when PEERDNS=no DNS2=114.114.114.114
BROWSER_ONLY Whether to allow only browsers BROWSER_ONLY=no
USERCTL Whether ordinary users are allowed to control the network card device, yes means allow, no means not allowed USERCTL=no
UUID Universal unique identification code, the main function is to identify the hardware, generally speaking, it is not necessary to fill in
PROXY_METHOD Proxy method, generally none, can be left blank
IPV4_FAILURE_FATAL If it is yes, it means that the device will be disabled after ipv4 configuration fails; if it is no, it means it will not be disabled. IPV4_FAILURE_FATAL=no
IPV6INIT Whether to enable IPV6, yes to enable, no not to enable. When IPV6INIT=yes, the two parameters IPV6ADDR and IPV6_DEFAULTGW can also be enabled. The former represents the IPV6 address and the latter represents the designated gateway IPV6INIT=yes
IPV6_AUTOCONF Whether to use IPV6 automatic configuration, yes means use; no means not use IPV6_AUTOCONF=yes
IPV6_DEFROUTE Whether to give IPV6 the default route IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL After IPV6 configuration fails, whether to disable the device IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE Generate IPV6 address model, optional values ​​are stable-privacy and eui64 IPV6_ADDR_GEN_MODE=stable-privacy

After the configuration file is modified successfully, remember to restart the network card service systemctl restart NetworkManager.service

TYPE=Ethernet
ONBOOT=yes
DEVICE=ens33
USERCTL=no
IPV4_FAILURE_FATAL=no
BROWSER_ONLY=no
BOOTPROTO=static
PEERDNS=no
IPADDR=192.168.100.4
PREFIX=24
GATEWAY=192.168.100.1
DNS1=8.8.8.8
DNS2=114.114.114.114
TYPE=Ethernet
ONBOOT=yes
DEVICE=ens33
USERCTL=no
BROWSER_ONLY=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no

View network information

ip a or nmcli device show

Author: tianci li

Contributors: Steven Spencer, Neil Hanlon

Back to top