netfilter

Tool to generate a Linux kernel module for custom rules with Netfilter hooking. (block ports, Hidden mode, functions to protect, etc.)

Insert trace-points into the running configuration to observe the path of packets through the iptables chains.

Open Source Deep Packet Inspection Software Toolkit

A Linux kernel IPC firewall and logger for Android and Binder

Docker container for intercepting packets with scapy from a netfilter queue (nfqueue)

Layer 4 Single Packet Authentication Linux kernel module utilizing Netfilter hooks and kernel supported Berkeley Packet Filters (BPF)

Opensvp is a security tool implementing "attacks" to be able to test the resistance of firewall to protocol level attack.

Rust bindings for iptables

Allow/deny traffic in nftables using country specific IP blocks

Pure-Go Conntrack implementation; for humans.

A Bash script to create nftables sets of country specific IP address ranges for use with firewall rulesets.

Pure-Go Netfilter Netlink family implementation.

Netfilter Conntrack Stats Exporter

The Linux netfilter conntrack-based connection flows pretty printer.

A good addition to your conntrack-tools package. Conntracker acts like a firewall sniffer, it analysis, realtime, with very low overhead, all iptables (or nf_tables) existing flows and inform you, at the very end of its execution, all flows in a sorted and consumable way.

c-binding free API for golang to communicate with the log subsystem of netfilter

TeaVPN2 - An open source VPN Software

A plugin of netfilter-persistent in debian/ubuntu to make ipset rules persistent, especially on reboot.

c-binding free API for golang to communicate with the queue subsystem of netfilter

ARP spoofing, HTTP redirection, DNS spoofing and DNS forging using pcap library

UPPERSAFE Open Source Firewall

nfsinkhole is a Python library and scripts for setting up a Linux server as a sinkhole (monitor, log/capture, and drop all traffic to a secondary interface).

An encryption trial with AES-128 on Linux kernel subsystem Netfilter

NAT type configuration and switch

Go implentation for Iptables

Netfilter iptables on IPv4 & IPv6, 1st Edition: It's a collaborative book on Netfilter iptables and its programming.

Easier tracing of packets through iptables

generating problems on RTP streams : latency, delay, jitter

Caching Dns proxy for GNU/Linux

A Network access firewall for Unix like OS and specifically supports Raspberry Pi 3 .