How to Setup network on centos 7

Setup network on centos 7

let’s start, Type “nmcli d” command in your terminal for quick identification of Ethernet cards installed in your machine.
Setup network on centos 7
Here we have 2 interfaces named “enp0s17” and “enp0s18” . it might be different in your case ( Eg: em1 or p4p1 ).

GUI Mode

Recommended for beginners
Step 1 » Type this command “nmtui” to open Network manager and press enter after choosing ” Edit a connection” ( Use TAB for choosing options ) .
Setup network on centos 7
Step 2 » Now you can see all network interfaces, choose one and click “Edit“.
Setup network on centos 7

» DHCP configuration

Step 3 » For DHCP,
1. Choose “Automatic” in IPv4 CONFIGURATION.
2. Choose Automatic Connect check box.
3. Press OK and quit Network manager.
Setup network on centos 7
Now Restart network service by typing below command.
systemctl restart networkNow your server will get IP Address from DHCP .

» Static configuration

Step 4 » For manual IP address,
1. Choose “Manual” in IPv4 CONFIGURATION.
2. Add IP Address with Subnet , Gateway and DNS server ( Refer below image ).
3. Choose Automatic Connect check box.
4. Press OK and quit Network manager.
Setup network on centos 7
Now Restart network service by typing below command.
systemctl restart networkThat’s it, Interface will have static IP.

Command Mode

Step 1 » Network interface config files are located in /etc/sysconfig/network-scripts/ directory. Open ifcfg-enp0s17 file ( For interface enp0s17 ) and you can see the content like below.
[root@krizna ~]# vi /etc/sysconfig/network-scripts/ifcfg-enp0s17
TYPE=Ethernet
BOOTPROTO=none
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
NAME=enp0s17
UUID=7f1aff2d-b154-4436-9497-e3a4dedddcef
ONBOOT=no
HWADDR=00:0C:29:A1:B5:D6
PEERDNS=yes
PEERROUTES=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes

» DHCP configuration

Step 2 » For DHCP
Find the below lines in config File.
BOOTPROTO=none
ONBOOT=no
and replace with
BOOTPROTO=dhcp
ONBOOT=yes
Now Restart network service by typing below command.
systemctl restart networkNow your server will get IP Address from DHCP

» Static configuration

Step 3 » For Static IP.
Find the below lines in config File.
BOOTPROTO=none
ONBOOT=no
and replace with
BOOTPROTO=static
ONBOOT=yes
And add the below lines at the end of the file.
IPADDR=172.27.0.32
NETMASK=255.255.255.0
GATEWAY=172.27.0.1
DNS1=172.27.0.5
File will look like below after changes.
TYPE=Ethernet
BOOTPROTO=static
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
NAME=enp0s17
UUID=f0c5b37d-299a-43cb-b74b-618bb252d129
ONBOOT=yes
HWADDR=00:0C:29:A1:B5:CC
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPADDR=192.168.1.10
NETMASK=255.255.255.0
GATEWAY=192.168.1.1
DNS1=192.168.1.5

Now Restart network service by typing below command.
systemctl restart networkNow Interface will have static IP.
Additionally you can use /etc/sysconfig/network file for hostname and DNS .
HOSTNAME=server.krizna.com
DNS1=192.168.1.5
DNS2=8.8.8.8
SEARCH=krizna.com

 

 

source: krizna .com/centos/setup-network-centos-7/