Network

ifconfig (obsolete)

deprecated: now replaced by ìp command

Attribute static ip, for example 192.168.1.102/24 on eth0:

ifconfig eth0 192.168.1.102 netmask 255.255.255.0 broadcast 192.168.1.255

Note: there is not gateway

DNS

/etc/resolv.conf:

; google dns server
nameserver 8.8.8.8

; ovh dns server
nameserver 213.186.33.99

Open ports

List current open ports

ss -ntlp | grep LISTEN

NOTE: previously named netstat instead of ss

Disable ip v6

sysctl -w net.ipv6.conf.all.disable_ipv6=1
sysctl -w net.ipv6.conf.default.disable_ipv6=1

Show interfaces

ip -c link show

Set up static ip adress

config file

/etc/network/interfaces:

iface enp0s31f6 inet static
  address 192.168.1.2
  netmask 255.255.255.0
  gateway 192.168.1.1

Note: ensure that allow-hotplug enpXX is commented and that iface enpXX inet dhcp is static and not dhcp.

cli

ip address add 192.168.1.2/24 dev enp0s31f6
ip route add default via 192.168.1.1

Notes:

• replace enp0s31f6 by the correct interface
• when finished you can remove with del instead of add

Test bandwidth

package iperf available on debian

server: iperf -s client: iperf -c 192.168.1.10