Linux

criar uma nova interface da sua rede:
> sudo ifconfig interface:1 ip
> ex: sudo ifconfig enp0s3:1 192.168.9.0

conectar cliente no servidor:
> sudo user@ip
> ex: sudo tierry@192.168.45.9

conectar ao servidor usando porta:
> sudo -p porta user@ip
> sudo -p 22 tierry@192.168.45.9

alterar a porta do servidor:
> sudo nano /etc/ssh/sshd_config

alterar o ip no server:
> sudo nano etc/network/interfaces

#The loopback network interface
auto lo enp0s3
iface lo inet looppback

#The primary network interface
iface enp0s3 inet static
address 192.168.9.0
netmask 255.255.255.0
broadcast 192.168.1.255
network 192.168.1.0
gateway 192.168.1.254
dns-nameservers 192.169.1.254

reiniciar o network do server:

> sudo systemctl restart networking.service

DHCP:
apt-get