Configuring Your Firewall to Filter Network Packets

0 To create packet-filtering rules for outgoing traffic, configure your Linux firewall to deny all outgoing traffic unless explicitly allowed.Where incoming traffic is concerned, you have many options, including to forbid all incoming traffic unless it is part of an already established session, and to disable all forwarding except for networks that require it.

0 Most Linux operating systems, such as Red Hat, Slackware, SuSE, and Caldera, support IP forwarding, masquerading, and firewalling by default. However, you may have to reconfigure your kernel in order to provide full functionality.

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