Initial Settings : Network Settings2021/08/17

	Change to static IP addres if you use Debian as a server.
[1]	The interface name [enp1s0] is different on each environment, replace it to your own one.

root@dlp:~#

vi /etc/network/interfaces

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
allow-hotplug enp1s0
# comment out
#iface enp1s0 inet dhcp

# add static settings
iface enp1s0 inet static
# IP address
address 10.0.0.30
# network address
network 10.0.0.0
# subnet mask
netmask 255.255.255.0
# broadcast address
broadcast 10.0.0.255
# default gateway
gateway 10.0.0.1
# name server
dns-nameservers 10.0.0.10

root@dlp:~#

systemctl restart ifup@enp1s0

root@dlp:~#

ip addr

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 pfifo_fast state UP group default qlen 1000
    link/ether 52:54:00:0c:48:f6 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.30/24 brd 10.0.0.255 scope global enp1s0
       valid_lft forever preferred_lft forever
    inet6 fe80::5054:ff:fe0c:48f6/64 scope link
       valid_lft forever preferred_lft forever

[2]	Disable IPv6 if you do not need it.

root@dlp:~#

echo "net.ipv6.conf.all.disable_ipv6 = 1" >> /etc/sysctl.conf

root@dlp:~#

sysctl -p

net.ipv6.conf.all.disable_ipv6 = 1

root@dlp:~#

ip addr

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 pfifo_fast state UP group default qlen 1000
    link/ether 52:54:00:0c:48:f6 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.30/24 brd 10.0.0.255 scope global enp1s0
       valid_lft forever preferred_lft forever

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