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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

Advanced

Duration

30m

Published

Nov 05, 2018

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
```
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
```

Author

A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

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