By default we do not filter traffic. However, if you have a VPS, you maybe want to block unwanted traffic or you would like to only allow traffic from specific sources. This blog explains a bit the basics of firewall configuration on a Greenhost VPS. This document assumes a Debian or Ubuntu based system, however, the basics are similar on all Linux based operating systems
What is a firewall
A firewall controls traffic flowing into, leaving or going through your VPS. This manual will discuss only traffic going into your VPS and does not focus on filtering outgoing or forwarding/routing traffic...
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