SMB Share checker (Visit this link)

As stated on the original check complete interface table page this plugin allows you to monitor one network device (e.g. router, switch, server) without knowing each interface in detail. Only the hostname (or ip address) and the snmp community string are required. But additional to the original this 2nd version gives you performance data for all the interfaces if you wish. And furthermore it calculates the interface load and informs you on configured VLANs. Check Live-Demo here: http://nagios.demo.netways.de/nagios/cgi-bin/status.cgi?host=f1-switch

This plugin checks number of open tcp connections and can send warnings or critical alert of there are too many or too few. Can run either directly on the box or use SNMP.

A simple network-interface status check-plugin (based on bash and mii-tool)

[perl] Yet Another (more generic) parser for Apache's server-status handler. Fetches the server-status page of an apache, extracts some information and evaluates them. Tested with Apache 2.0 - not (yet) working with Apache 1.x

Plugin to check CDP or FDP neighbour table. This plug requires you to have installed libsnmp-info from http://snmp-info.sourceforge.net/ and the necessary snmp MIB files.

Checks network bridges using STP (Spanning Tree Protocol) for network path redundancy.

Check-Plugin to verify an address registered with dyndns.org (and optionally to update the registered address upon detecting a mismatch!)

Read measurement data about various network (and traffic) statistics from Packeteer appliances.

Tests bonding interfaces (comptatilb with multiple interfaces)