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firewall | firewall game |
Firewall Game

A packet filter firewall filters packets based on the information in the TCP/IP headers. Especially, the TCP and UDP well known ports are important for filtering since they identify specific application processes.

In this game a firewall with 5 ports has to be controlled. The green ports indicate that packets are allowed to pass, whereas a red port signals that packets for this port have to be filtered by the firewall. The five well known ports are:
  • 80: HTTP ((HyperText Transfer Protocol)
  • 20: FTP (File Transfer Protocol)
  • 443: HTTPS (HTTP Secure)
  • 25: SMTP (Simple Mail Transfer Protocol)
  • 23: Telnet

If you press start you should decide which packets are allowed to pass the firewall. Please click on all packets that have to be filtered they will be destroyed. Be careful the firewall configuration changes during the game!