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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.
They provide a table-based system for defining firewall rules that can filter or transform packets. The tables can be administered through the user-space tools iptables, ip6tables, arptables, and ebtables. Notice that although both the kernel modules and userspace utilities have similar names, each of them is a different entity with different ...
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It provides firewall features by acting as a front-end for the Linux kernel's netfilter framework. firewalld's current default backend is nftables. Prior to v0.6.0, iptables was the default backend. [3] Through its abstractions, firewalld acts as an alternative to nft and iptables command line programs.
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]
This speeds up firewall configuration changes for setups having large rulesets; it can also help in avoiding race conditions while the rule changes are being executed. nftables also includes compatibility features to ease transition from previous firewalls, command-line utilities to convert rules in the iptables format, [15] and syntax ...
Windows Routing and Remote Access Service is a feature that can be installed on Windows (mainly server) Operating Systems, and can perform routing functions, NAT, and implement firewall rules. Zentyal (formerly eBox Platform) Active: Ubuntu derivative: x86, x86-64: Open source: Free with paid services available
FireHOL first parses the configuration file and then sets the appropriate iptables rules to achieve the expected firewall behavior. It is a large, complex BASH script file, depending on the iptables console tools rather than communicating with the kernel directly. Any Linux system with iptables, BASH, and the appropriate tools can run it.