Code-Memo

Network interfaces (ip, ifconfig)

ip (recommended)

Show interfaces:

ip link
ip -br link
ip addr
ip -br addr

Bring interface up/down:

sudo ip link set dev eth0 up
sudo ip link set dev eth0 down

Add/remove address (temporary):

sudo ip addr add 192.168.1.50/24 dev eth0
sudo ip addr del 192.168.1.50/24 dev eth0

ifconfig (legacy)

Some systems still ship ifconfig via net-tools, but it’s deprecated.

ifconfig -a

Names and types

eth0, enp0s3: wired
wlan0, wlp2s0: wireless
lo: loopback
br0: bridge
bond0: bonding
tun0 / wg0: VPN tunnels

Persistent configuration

Depends on distro:

NetworkManager (nmcli)
systemd-networkd
/etc/network/interfaces (older Debian)

Routing basics