Network Security

What services are running:

netstat -nutlp

lsof -i

What ports are listening:

nmap HOSTNAME_or_IP

Test a port:

telnet IP PORT

nc -v IP PORT

Iptables

iptables -L = display the filter table

-nL = use numeric output

-vL = use verbose output

iptables -t nat -L = display the nat table

Notes:

• nmap -sV IP
• nmap -O IP ------detect OS
• nmap -oG - IP [-p PORT]
• nmap IP -Pno -vv
• os-prober IP
• oscanner -s IP
• nc -v IP PORT