Scan Types
supported by Nmap (cont.)
¨TCP FIN (-sF)
–Sends a TCP FIN to
each port. A RESET indicates that the port is closed, while no response may mean that the port is
open
¨TCP Xmas Tree
(-sX)
–Sends a packet with
FIN, URG, and PUSH code bits set. A RESET indicates that the port is closed, while no response may
mean that the port is open
¨Null (-sN)
–Sends packets with no code bits set. A RESET indicates that the port is closed, while no response may mean that the port is
open.
Note: Microsoft systems don’t follow the RFCs
regarding when to send a RESET if a FIN,
Xmas Tree, or Null packet comes in.
These scan types useful for other platforms