* ip address show  
* ip address add 192.168.10.100/24 dev ens192
* ip -br -c a s
* ifconfig

* ip route show
* ip route del default
* ip route add default via 192.168.10.1
* ip route add 172.16.10.0/24 via 192.168.10.10
* ip -c r s
* route -n

* ping

* /etc/network/interfaces
      auto lo
      iface lo inet loopback

      auto ens192
      iface ens192 inet static
          address 192.168.10.100/24
          gateway 192.168.10.1

      iface ens192 inet6 static
          address 2a0e:0:1:b:109::/64
          gateway 2a0e:0:1:b::1

* /etc/resolv.conf
      nameserver 85.15.1.14
      nameserver 85.15.1.15

* wget
* links
* dig (Domain Information Groper)

* tcpdump -i enp3s0 -nq port 22
* tcpdump -i enp3s0 -nq host 192.168.100.2
* tcpdump -i enp3s0 -nq src host 192.168.100.2
* tcpdump -i enp3s0 -nq tcp
* tcpdump -i enp3s0 -nq src host 192.168.100.2 and port 22
* tcpdump -i enp3s0 -nq \( tcp or udp \) and src host 192.168.100.2 and dst port 22
* tcpdump -i enp3s0 -nn -NN -xx -XX -s0 -vvv -tttt -c 10 udp and port 53