Linux firewalls: What you need to know about iptables and firewalld
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This article is excerpted from my book, Linux in Action, and a second Manning project that’s yet to be released.
The firewall
A firewall is a set of rules. When a data packet moves into or out of a protected network space, its contents (in particular, information about its origin, target, and the protocol it plans to use) are tested against the firewall rules to see if it should be allowed through. Here’s a simple example:
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