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Using 'firewalld' for Advanced Packet Filtering

Managing a local firewall is something pretty much every Linux admin is going to have to do during their career. Many operating systems have adopted firewalld as the local firewall management system moving forward. Setting this up can lead to a more secure server and increase security through your environment.

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Path Info

Level
Clock icon Intermediate
Duration
Clock icon 1h 0m
Published
Clock icon Nov 12, 2018

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Table of Contents

  1. Challenge

    Block SSH but allow HTTP

    Use the block zone to filter on specific hosts and ports.

    You can run the following commands:

    firewall-cmd --zone=block --add-source=10.0.1.101

    firewall-cmd --zone=block --add-service=http

    You can verify settings with:

    firewall-cmd --info-zone=block

  2. Challenge

    Allow ping

    Since ping uses the ICMP protocol and not a specific port, we can't just add a port or service.

    We need to use a rich rule:

    firewall-cmd --zone=block --add-rich-rule='rule protocol value="icmp" accept'

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