Display who are currently logged in
Answer:
Type "who" in the command shell
# who
It will display all the users currently logged in.
E.g.
john pts/0 Jan 3 00:36 (232.127.126.23)
Jan 022010
Dec 252009
What is the command to display the current TCP/IP configuration?
Answer:
Try:
ifconfig -a
Dec 192009
Ban a remote IP Address using iptables
Answer:
iptables -A INPUT -s IP -j DROP
Replace IP with the actual remote IP address.
Note that the blocking will be lost when server reboot. You would need to save the rule(s) into a script and reload when server reboot.
