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Most of us have heard of firewalls, but do we understand the concepts that make them work. This week, Host Africa will take a look at some basic firewall concepts and try to make them a bit easier to understand. Types of firewall Traditionally, there are two main types with many variations in-between. These two…
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CentOS 7 firewall On Centos 7, the default firewall is firewalld. Even though this is just a shell interface to configure iptables, it has its limits when it comes to applying advanced rules and customizing your firewall. You can fix this by getting rid of firewalld and using only iptables rules. Do not uninstall firewalld as fail2ban…
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Basics In Linux, there are a few basic concepts that we need to understand before we start. Firewall rules are, in general, applied as they are read, from the top down. The best firewall DENIES ALL and only ALLOWS what is needed. OUTBOUND rules are generally more relaxed than INBOUND. A Policy is what gets…
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