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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).
FreeLAN, open-source, free, multi-platform IPv4, IPv6 and peer-to-peer VPN software over UDP/IP. n2n, an open source Layer 2 over Layer 3 VPN application which uses a peer-to-peer architecture for network membership and routing; Tinc, Ethernet/IPv4/IPv6 over TCP/UDP; encrypted, compressed
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 ...
The free community Vyatta Core software (VC) was an open source network operating system providing advanced IPv4 and IPv6 routing, stateful firewalling, secure communication through both an IPSec based VPN as well as through the SSL based OpenVPN. [10] In October 2013, an independent group started a fork of Vyatta Core under the name VyOS. [11]
Uncomplicated Firewall (UFW) is a program for managing a netfilter firewall designed to be easy to use. It uses a command-line interface consisting of a small number of simple commands, and uses iptables for configuration. UFW is available by default in all Ubuntu installations since 8.04 LTS. [1]
IPFire is a hardened [3] open source Linux distribution that primarily performs as a router and a firewall; a standalone firewall system with a web-based management console for configuration. IPFire originally started as a fork of IPCop [ 4 ] and has been rewritten on basis of Linux From Scratch since version 2. [ 5 ]
Dynamic port forwarding (DPF) is an on-demand method of traversing a firewall or NAT through the use of firewall pinholes. The goal is to enable clients to connect securely to a trusted server that acts as an intermediary for the purpose of sending/receiving data to one or many destination servers. [12]
VNS3 is a software-only virtual appliance that allows users to control access and network topology and secure data in motion across public and private clouds.VNS3 is a virtual router, switch, firewall, protocol re-distributor, and SSL/IPSec VPN concentrator. [2]