SSH Server

You can start ssh server starting deamon sshd.
For example in archlinux you can start deamon using rc.d (sudo rc.d start sshd).
sshd config file si /etc/ssh/sshd_config.
You can edit it with your favourite editor for example: sudo nano /etc/ssh/sshd_config
First of all you can specify the protocol (Protocol 2 reccomended).
You can change default port, for example : PORT 3333
You can also change listen address ListenAddress 0.0.0.0
PasswordAuthentication no -> disable password (yes to enable).
AllowUsers user1, user2 ..
For example : AllowUser root, hackforlulz

If you have any problem or if you need some explanations just write under this post!