Debian 9 Stretch
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Network Settings
2017/06/18
[1] Change to static IP addres if you use Debian as a Network Server.
[ens3] 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 ens3
# comment out

#
iface ens3 inet dhcp
# add these lines (replace [ens3] name to your own environment)

iface ens3 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:~#
root@dlp:~#
ip addr

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
    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: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 52:54:00:2b:05:3f brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.30/24 brd 10.0.0.255 scope global ens3
       valid_lft forever preferred_lft forever
    inet6 fe80::5054:ff:fe2b:53f/64 scope link
       valid_lft forever preferred_lft forever
[2] Disable IPv6 if you do not need.
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 1
    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: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 52:54:00:2b:05:3f brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.30/24 brd 10.0.0.255 scope global ens3
       valid_lft forever preferred_lft forever
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