Unix-based systems and various device platforms, such as Cisco IOS, run remote information services that provide system, user, and network details over IP. Such services can be probed to collate username listings and details of trusted networks and hosts, and, in some cases, compromise systems directly. I derived a basic list of remote information services from the /etc/services file: systat 11/tcp netstat 15/tcp domain 53/tcp domain 53/udp finger 79/tcp auth 113/tcp snmp 161/udp ldap 389/tcp rwho 513/udp globalcat 3268/tcp |