Mission 91

Firewall baseline

Inspect and update simulated firewall rules with caution.

Security administration
8 minutes Admin Lesson 91 of 360
ufw
Lesson 91 of 360 0/360 lessons 0/17 missions Security administration · 8 minutes
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learner@clairos:/home/learner $ Unix ops lab: type a command, press Enter
Instructions 8 minutes

Click any instruction for the command details, the why, and the common mistake to avoid.

Verbose status

Run ufw status verbose.

ufw status verbose
Allow https

Run ufw allow 443/tcp.

ufw allow 443/tcp
Deny telnet

Run ufw deny 23/tcp.

ufw deny 23/tcp
Lesson support

What to notice while you play.

Objective

Use verbose status before adding simulated rules.

Hint

Run ufw status verbose, then allow 443/tcp.

Why it matters

A baseline prevents duplicate or contradictory rules.

Common mistakes
  • Adding rules blindly.
  • Forgetting to document denied ports.
Reference

Commands in this lesson.

ufw status

Inspect simulated firewall rules.