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net-firewall/iptables

Linux kernel (2.4+) firewall, NAT and packet mangling tools

net-misc/vde

Virtual distributed ethernet emulator for emulators like qemu, bochs, and uml

app-emulation/libvirt

C toolkit to manipulate virtual machines

net-analyzer/wireshark

Network protocol analyzer (sniffer)

net-analyzer/net-snmp

Software for generating and retrieving SNMP data

net-analyzer/snort

The de facto standard for intrusion detection/prevention

net-analyzer/metasploit

Advanced framework for developing, testing, and using vulnerability exploit code

net-analyzer/scanlogd

A port scan detection tool

net-libs/libssh

Access a working SSH implementation by means of a library

app-admin/ulogd

A userspace logging daemon for netfilter/iptables related logging

app-admin/sagan

Sagan is a multi-threaded, real time system and event log monitoring system

net-analyzer/flowgrind

Network performance measurement tool

net-libs/daq

Data Acquisition library, for packet I/O

app-emulation/crossover-bin

Commercial version of app-emulation/wine with paid support

app-admin/lnav

A curses-based tool for viewing and analyzing log files

sci-libs/pcl

2D/3D image and point cloud processing

net-misc/sipp

A free Open Source test tool / traffic generator for the SIP protocol

app-emulation/wine-staging

Free implementation of Windows(tm) on Unix, with Wine-Staging patchset

net-wireless/horst

Small 802.11 wireless LAN analyzer

net-misc/ptpd

Precision Time Protocol daemon

app-emulation/wine-vanilla

Free implementation of Windows(tm) on Unix, without external patchsets

net-analyzer/hsflowd

Exports physical and virtual server performance metrics using the sFlow protocol

app-crypt/johntheripper-jumbo

Fast password cracker, community enhanced version

app-emulation/pcem

A PC emulator that specializes in running old operating systems and software

media-sound/scream

Plays sound received from network or from a QEMU Windows VM

net-p2p/n2n

A Layer Two Peer-to-Peer VPN

media-libs/mediastreamer2

Mediastreaming library for telephony application

app-emulation/previous

a NeXT 68k workstation emulator

app-emulation/wine-d3d9

Free implementation of Windows(tm) on Unix, with Gallium Nine patchset

app-emulation/wine-lutris

Free implementation of Windows(tm) on Unix, with Lutris patchset.