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Working with IP Sets and iptables

IP Sets can facilitate the management of a complex firewall ruleset. This exercise refreshes basic skills with the `iptables` command and begins developing an understanding of working with IP Sets. Having a working knowledge of IP sets and `iptables` is a requirement of the advanced certification exams such as the LPIC-3 303-200.

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Path Info

Level
Clock icon Advanced
Duration
Clock icon 30m
Last updated
Clock icon Apr 06, 2025

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Table of Contents

  1. Challenge

    Create a new IP set called `clienthosts` that contains the IP and Port combinations for each client server.

    Create a new IP set called clienthosts that contains the IP and Port combinations for each client server. Be sure the ipset is configured to persist a reboot.

    Run the following commands:

    ipset create clienthosts hash:ip,port 
ipset add clienthosts 10.0.1.100,80 
ipset add clienthosts 10.0.1.200,80
ipset save clienthosts > /etc/sysconfig/ipset

  2. Challenge

    Add a new rule to the INPUT chain that accepts traffic from all IP/port combinations as source IP/destination port in the `clienthostsIP` set.

    Add a new rule to the INPUT chain that accepts traffic from all IP/port combinations as source IP/destination port in the clienthostsIP set. The rule should persist a reboot.

    Run the following commands:

    iptables -I INPUT -m set --match-set clienthosts src,dst -j ACCEPT 
iptables-save > /etc/sysconfig/iptables
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