17. Basic Ubuntu Firewall Configuration with firewalld
All Linux distributions are provided with a firewall solution of some form. In the case of Ubuntu this takes the form of the Uncomplicated Firewall outlined in the previous chapter. This chapter will introduce a more advanced firewall solution available for Ubuntu in the form of firewalld.
17.1 An Introduction to firewalld
Originally developed for Red Hat-based Linux distributions, the firewalld service uses a set of rules to control incoming network traffic and define which traffic is to be blocked and which is to be allowed to pass through to the system and is built on top of a more complex firewall tool named iptables.
The firewalld system provides a flexible way to manage incoming traffic. ...
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