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Protecting Your System via `firewalld` in SUSE Linux Enterprise

In this hands-on lab, we will work with firewalld via YaST to enable the firewall as well as allow some ports. This is a fundamental process for any administrator and something that should be considered a basic task.

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Path Info

Clock icon Beginner
Clock icon 30m
Clock icon Jan 10, 2020

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Table of Contents

  1. Challenge

    Verify the Status of the Firewall on the Affected System

    1. Check iptables:

      sudo iptables -S
    2. Verify the rules are blank.

  2. Challenge

    Use YaST to Enable the Firewall, Move the Interface, and Allow the Appropriate Services

    1. Open YaST:

      sudo yast
    2. Under Security and Users > Firewall > Start-Up, set the current status to be start, and after reboot to start.

    3. Go to Interfaces, and move the eth0 interface to the public zone.

    4. Configure the public zone to add HTTP, and confirm that at least HTTP and SSH are allowed

    5. Save the configuration and exit YaST.

  3. Challenge

    Verify That the Firewall Is Set Correctly

    1. Check iptables:

      sudo iptables -S
    2. Near the end of the listing, you should see the rules for:

      -A IN_public_allow -p tcp -m tcp --dport 22 -m conntrack --ctstate NEW -j ACCEPT
      -A IN_public_allow -p tcp -m tcp --dport 80 -m conntrack --ctstate NEW -j ACCEPT

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