Objetivo: mudar para endereços IP estáticos se você usa Debian como um servidor.

[1] O nome da interface [enp1s0] é diferente em cada ambiente, substitua-o pelo seu próprio.

[2] Desative o IPv6 se não precisar dele. 

				
					 root@debian:~# echo "net.ipv6.conf.all.disable_ipv6 = 1" >> /etc/sysctl.conf

root@debian:~# sysctl -p
net.ipv6.conf.all.disable_ipv6 = 1

root@debian:~# 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 192.168.15.100/24 brd 192.168.15.255 scope global enp1s0
       valid_lft forever preferred_lft forever

				
			
				
					 root@debian:~# 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).

# A interface loopback
auto lo
iface lo inet loopback

# A interface primária
allow-hotplug enp1s0
# comente ou remova a linha a seguir
#iface enp1s0 inet dhcp

# adicione as informações estáticas
iface enp1s0 inet static
    address 192.168.15.20
    network 192.168.15.0
    netmask 255.255.255.0
    broadcast 192.168.15.255
    gateway 192.168.15.1
    dns-nameservers 8.8.8.8

root@debian:~# systemctl restart ifup@enp1s0

root@debian:~# 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 192.168.15.20/24 brd 192.168.15.255 scope global enp1s0
       valid_lft forever preferred_lft forever
    inet6 fe80::5054:ff:fe0c:48f6/64 scope link
       valid_lft forever preferred_lft forever
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