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Observium is an autodiscovering PHP/MySQL/SNMP based network monitoring which includes support for a wide range of network hardware and operating systems including Cisco, Linux, FreeBSD, Juniper, Brocade, Foundry, HP and many more. Observium has grown out of a lack of easy to configure network monitoring platforms. It is intended to provide a more navigable interface to the health and performance of your network. Its design goals include collecting as much historical data about devices as possible, being completely autodiscovered with little or no manual intervention, and having a very intuitive interface.

Net::Netmask parses and understand IPv4 CIDR blocks. It's built with an object-oriented interface. Nearly all functions are methods that operate on a Net::Netmask object.

Pancho was written with the goal of allowing network administrators make a change to a group of Cisco routers without being required to log into each host. Pancho also provides the flexibility to allow admins to use its function against a single host, a select group or the entire whole. In addition to changes to current configurations on remote routers, pancho is also capable of archiving router configurations manually or through automated runs. Support is provided for Cisco, Foundry, Nortel/Alteon, Avaya, or Dell PowerConnect devices.

Weathermap is a network visualisation tool, to take data you already have and show you an overview of your network in map form.

This package contains tools that monitors ethernet activity and maintains a database of ethernet/ip address pairings. It also reports certain changes via email.

Rate is a swiss-army-knife command-line traffic analysis tool, designed to help a network administrator to see what is happening at a router at the moment. Unlike tcpdump(1), rate uses statistical and stream-oriented methods, and will never produce an output stream at a speed beyond human perception. The output is less accurate, however. Rate features four different operating modes, designed to perform the following tasks: estimating overall traffic rates, determining nodes generating the highest traffic, determining connections and flows generating the highest traffic and extracting strings from packets.

flowd is a small, fast and secure NetFlow collector. It offers the following features: * Understands NetFlow protocol v.1, v.5, v.7 and v.9 (including IPv6 flows) * Supports both IPv4 and IPv6 transport of flows * Secure: flowd is privilege separated to limit the impact of any compromise * Supports filtering and tagging of flows, using a packet filter-like syntax * Stores recorded flow data in a compact binary format which supports run-time choice over which flow fields are stored * Ships with both Perl and Python interfaces for reading and parsing the on-disk record format * Is licensed under a liberal BSD-like license

wdiag is a utility to monitor Westell DSL modem diagnostics and line statistics. It reports SNR, Attenuation, etc for the DSL line.

A set of open source tools for accessing the 2.4GHz Wi-Spy USB spectrum analyzer by Metageek LLC, http://www.metageek.net/

Net::BitTorrent is a class based implementation of the current BitTorrent Protocol Specification. Each Net::BitTorrent object is capable of handling several concurrent .torrent sessions.