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→IPTABLES
Some documentation to get started with (you'll need to find more):
* [https://en.wikipedia.org/wiki/Iptables#Overview Overview] section on Wikipedia is a good (short) overview of the system. You don't need to understand that diagram though.
* [https://wiki.centos.org/HowTos/Network/IPTables CentOS Wiki]has some basic commands, you won't need to use all of them for the work below.
=== Your tasks ===