What firewall Can Be Used On A Self-Managed Server?

All Linux distributions have a netfilter utility, IPtables, which will enable a system administrator to set up a locally hosted, software based firewall on a Linux host. IPtables natively support stateful packet inspection, packet filtering by MAC address, TCP header inspection, and rate packet limiting.

Microsoft Windows servers

Microsoft Windows Servers come standard with a built-in firewall that can be activated on the host at any time. For more information and instructions to set up and manage the Windows Firewall, refer to Microsoft TechNet