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Icinga is an enterprise grade open source monitoring system which keeps watch over networks and any conceivable network resource, notifies the user of errors and recoveries and generates performance data for reporting. Scalable and extensible, Icinga can monitor complex, large environments across dispersed locations. Icinga is a fork of Nagios and is backward compatible. That said, Nagios configurations, plugins, and addons can all be used with Icinga. Though Icinga retains all the existing features of its predecessor, it builds on them to add many long awaited patches and features requested by the user community.

This is the meta port for Icinga 1.x including net-mgmt/icinga-core and net-mgmt/icinga-classicweb.

Nagios 是一个主机和服务监视器，用来在你的客户和最终用户或者管理者发现 前告诉你网络问题。监视守护进程通过你指定的外部插件，间隙性地检查你的 主机和服务的状态。当遇到问题时，守护进程可以通过多个渠道（电子邮件、 即时通讯工具、手机短信等）发出通知给管理人员。也可以通过浏览器查看 当前的状态信息、历史日志和报告。

Kismet is an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system. Kismet will work with any wireless card which supports raw monitoring (rfmon) mode, and can sniff 802.11a, 802.11b, and 802.11g traffic. Kismet identifies networks by passively collecting packets. In addition to standard networks, it can detect (and given time, decloak) hidden networks, and infer the presence of nonbeaconing networks via data traffic. Capture sources that are known to be supported: Atheros, Prism2, WSP100, Drone, wtapfile, pcapfile. Kismet also supports radiotap headers and should work with current FreeBSD systems.

LibreNMS 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. LibreNMS 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.

NeDi is a lightweight network management framework, which is based on a scheduled discovery, an SQL backend, and a web-based user interface. It sucks information through SNMP or CLI from your switches and routers and stores information (such as MACs and IPs) in a MySQL database. Later, you can use its web interface to easily locate nodes withing your network.

Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. The monitoring daemon runs intermittent checks on hosts and services you specify using external "plugins" which return status information to Nagios. When problems are encountered, the daemon can send notifications out to administrative contacts in a variety of different ways (email, instant message, SMS, etc.). Current status information, historical logs, and reports can all be accessed via a web browser.

NagiosQL is a web based administration tool for Nagios. It helps you to easily build a complex configuration with all options, manage and use them. NagiosQL is based on a webserver with PHP, MySQL and file access to the Nagios configuration files.

Netmagis is a network management information system, which allows a network administrator to: - manage data for your BIND DNS and ISC DHCPD server, - delegate DNS management, - automatically generate network maps, - assign VLAN to equipment interfaces via a Web interface, - generate traffic graphs.

Nitpicker is a free IP flow accounter. It started because the commercial accounting software was just not fast, precise and reliable enough to fit today's ISP/MSP requirements. Here are some of the large benefits of nitpicker: - 100% free, in public domain - Designed for speed - Designed to run reliably under djb's daemontools - Consumes minimal processor power - Runs within little memory - Does not banally summarize the traffic - Stores all relevant traffic data for comprehensible interaction