Fedora 31
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Initial Settings : Network Settings
2019/11/04
[1] Set static IP address to the server.
( Replace the interface name [enp1s0] to your own one because it's not the same on any System )
# if you did not set Host Name during installation, 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

[root@localhost ~]#
nmcli connection modify enp1s0 ipv4.dns 10.0.0.1

# 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)

# show settings

[root@localhost ~]#
nmcli device show enp1s0

GENERAL.DEVICE:                         enp1s0
GENERAL.TYPE:                           ethernet
GENERAL.HWADDR:                         52:54:00:A3:1B:AB
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::6242:8157:2328:dff7/64
IP6.GATEWAY:                            --
IP6.ROUTE[1]:                           dst = fe80::/64, nh = ::, mt = 100
IP6.ROUTE[2]:                           dst = ff00::/8, nh = ::, mt = 256, tabl>

# show state

[root@localhost ~]#
ip addr 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:a3:1b:ab 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::6242:8157:2328:dff7/64 scope link noprefixroute
       valid_lft forever preferred_lft forever
[2] 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
resume=/dev/mapper/fedora-swap.....
# apply changes

[root@localhost ~]#
grub2-mkconfig -o /boot/grub2/grub.cfg

Generating grub configuration file ...
done
[root@localhost ~]#
[root@localhost ~]#
ip addr 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:a3:1b:ab 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
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