Realizar un escaneo de puertos básico (nmap -F smartir.ddnsco.com)
Nmap scan report for smartir.ddnsco.com (31.41.35.57)
Host is up (0.24s latency).
Not shown: 99 closed tcp ports (reset)
PORT STATE SERVICE
1723/tcp open pptp
Nmap done: 1 IP address (1 host up) scanned in 1.44 seconds