Network Settings

Initial Settings : Network Settings

If you did not configure network settings during the CentOS Stream Installation, Configure it like follows.

  1. To set static IP address to the server, Modify settings like follows.

( Replace the interface name [enp1s0] to your own one because it's not the same on any System )


# if you did not set HostName, set it like follows
[root@localhost ~]# hostnamectl set-hostname dlp.srv.world
# display devices
[root@localhost ~]# nmcli device
DEVICE  TYPE      STATE      CONNECTION
enp1s0  ethernet  connected  enp1s0
lo      loopback  unmanaged  --

# set IPv4 address
[root@localhost ~]# nmcli connection modify enp1s0 ipv4.addresses 10.0.0.30/24
# set gateway
[root@localhost ~]# nmcli connection modify enp1s0 ipv4.gateway 10.0.0.1
# set DNS
# for multiple DNS, specify with space separated ⇒ ipv4.dns "10.0.0.10 10.0.0.11 10.0.0.12"
[root@localhost ~]# nmcli connection modify enp1s0 ipv4.dns 10.0.0.10
# set DNS search base (your domain name)
[root@localhost ~]# nmcli connection modify enp1s0 ipv4.dns-search srv.world
# set [manual] for static setting (it's [auto] for DHCP)
[root@localhost ~]# nmcli connection modify enp1s0 ipv4.method manual
# restart the interface to reload settings
[root@localhost ~]# nmcli connection down enp1s0; nmcli connection up enp1s0
Connection 'enp1s0' successfully deactivated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/1)
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/2)

# confirm settings
[root@localhost ~]# nmcli device show enp1s0
GENERAL.DEVICE:                         enp1s0
GENERAL.TYPE:                           ethernet
GENERAL.HWADDR:                         52:54:00:A1:D5:6E
GENERAL.MTU:                            1500
GENERAL.STATE:                          100 (connected)
GENERAL.CONNECTION:                     enp1s0
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveC>
WIRED-PROPERTIES.CARRIER:               on
IP4.ADDRESS[1]:                         10.0.0.30/24
IP4.GATEWAY:                            10.0.0.1
IP4.ROUTE[1]:                           dst = 10.0.0.0/24, nh = 0.0.0.0, mt = 1>
IP4.ROUTE[2]:                           dst = 0.0.0.0/0, nh = 10.0.0.1, mt = 100
IP4.DNS[1]:                             10.0.0.10
IP6.ADDRESS[1]:                         fe80::f724:5898:361d:da04/64
IP6.GATEWAY:                            --
IP6.ROUTE[1]:                           dst = fe80::/64, nh = ::, mt = 100
IP6.ROUTE[2]:                           dst = ff00::/8, nh = ::, mt = 256, tabl>

# confirm state
[root@localhost ~]# ip address show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 52:54:00:a1:d5:6e brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.30/24 brd 10.0.0.255 scope global noprefixroute enp1s0
       valid_lft forever preferred_lft forever
    inet6 fe80::f724:5898:361d:da04/64 scope link noprefixroute
       valid_lft forever preferred_lft forever
  1. If you don't need IPv6, it's possible to disable it like follows.

[root@localhost ~]# vi /etc/default/grub
# line 7 : add
GRUB_CMDLINE_LINUX="ipv6.disable=1 rashkernel=auto .....
# apply changes
[root@localhost ~]# grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
done
[root@localhost ~]# reboot
[root@localhost ~]# ip address show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
2: enp1s0: <<BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 52:54:00:a1:d5:6e brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.30/24 brd 10.0.0.255 scope global noprefixroute enp1s0
       valid_lft forever preferred_lft forever