I want to enable root login just from one terminal machine, can i do that via /etc/default/login in console=/dev/console line ?
and if so what i have to type exactly, another question is it normal to edit the files inside defaults directly ? or i can copy it to /etc/ and edit it there and its override the one in /defaults ?
with telnet or ssh?
For both services.
If I remember correctly I think you may want to install tcp wrappers, you can use tcp wrappers to limit access to your boxes by IP addresses provided if your terminals are running static IP's, dunno abt dhcp though.