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2. Firewall (computing) - Wikipedia

   en.wikipedia.org/wiki/Firewall_(computing)

   In computing, a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on configurable security rules. [ 1 ] [ 2 ] A firewall typically establishes a barrier between a trusted network and an untrusted network, such as the Internet , [ 3 ] or between several VLAN s.

3. Port knocking - Wikipedia

   en.wikipedia.org/wiki/Port_knocking

   In computer networking, port knocking is a method of externally opening ports on a firewall by generating a connection attempt on a set of prespecified closed ports. Once a correct sequence of connection attempts is received, the firewall rules are dynamically modified to allow the host which sent the connection attempts to connect over specific port(s).

4. Netfilter - Wikipedia

   en.wikipedia.org/wiki/Netfilter

   Netfilter is a framework provided by the Linux kernel that allows various networking-related operations to be implemented in the form of customized handlers.Netfilter offers various functions and operations for packet filtering, network address translation, and port translation, which provide the functionality required for directing packets through a network and prohibiting packets from ...

5. Using McAfee: Firewalls - AOL Help

   help.aol.com/articles/Using-McAfee-Firewalls

   To enable firewall protection: 1. On the Windows taskbar, next to the clock, double-click the McAfee (M) icon. Note: If you're using Windows 7 or 8 and don't see the McAfee icon next to the clock, click the arrow next to the clock to reveal hidden icons. 2. In the McAfee SecurityCenter window, click Web and Email Protection. 3. Click Firewall ...

6. Stateful firewall - Wikipedia

   en.wikipedia.org/wiki/Stateful_firewall

   In computing, a stateful firewall is a network-based firewall that individually tracks sessions of network connections traversing it. Stateful packet inspection , also referred to as dynamic packet filtering, [ 1 ] is a security feature often used in non-commercial and business networks.

7. iptables - Wikipedia

   en.wikipedia.org/wiki/Iptables

   iptables is a user-space utility program that allows a system administrator to configure the IP packet filter rules of the Linux kernel firewall, implemented as different Netfilter modules. The filters are organized in a set of tables, which contain chains of rules for how to treat network traffic packets.

8. Network security - Wikipedia

   en.wikipedia.org/wiki/Network_security

   Once authenticated, a firewall enforces access policies such as what services are allowed to be accessed by the network users. [2] [3] Though effective to prevent unauthorized access, this component may fail to check potentially harmful content such as computer worms or Trojans being transmitted over the network.

9. Distributed firewall - Wikipedia

   en.wikipedia.org/wiki/Distributed_firewall

   A distributed firewall is a security application on a host machine of a network that protects the servers and user machines of its enterprise's networks against unwanted intrusion. A firewall is a system or group of systems ( router , proxy , or gateway ) that implements a set of security rules to enforce access control between two networks to ...