Safer Internet: Connection: Use a Firewall

Why

  • + Limit (mostly inbound) access
  • + Provide (some) anonymity
  • - Too much blocking could prevent some things from working properly

Basic

  • brainRouters typically provide some hardware firewall protection
  • [Refs]: "I Have a Router, Do I Need a Firewall?"
  • Enable your device's built-in software firewall; default settings are usually adequate
  • iOS: not necessary
  • macOS: System Preferences > Security & Privacy > Firewall > Turn On
    [screenshot] you'll need to click the lock and provide your admin password
  • macOS: {Figure 9. TCYOP-2: 54; TCYOP-1: 54}; Win: {Figure 8. TCYOP-2: 53; TCYOP-1: 53}
  • [Refs:macOS]: "Fire up your Mac's firewall"

[2] Intermediate

  • ice wallBlock/unblock specific ports/services via router or OS
  • macOS: System Preferences > Security & Privacy > Firewall > Firewall Options [screenshot]

[3] Advanced

References

macOS

Win