Debian Buster Network

A file with the name of each network device to be configured is placed in /etc/network/interfaces.d/. The example below demonstrates configuration and use of the wired Ethernet device 'eth0'. For complete documentation, see Debian's documentation here

Some common examples are shown below.

DHCP on eth0:

cat > /etc/network/interfaces.d/eth0 <<EOF
auto eth0
allow-hotplug eth0
iface eth0 inet dhcp
EOF

Static IP on eth0:

cat > /etc/network/interfaces.d/eth0 <<EOF
auto eth0
iface eth0 inet static
    address 192.0.2.7/24
    gateway 192.0.2.254
EOF

The network can then be brought up with the command:

ifup eth0