Nagios provides a monitoring option to evaluate routers and switches using SNMP, Simple Network Management Protocol. This course will show you how to set up Nagios and specifically how to locate the information you want to monitor with SNMP on a Cisco router. This is a Free Course available to anyone.

This Nagios Mini-Course shows you how to configure Passive Checks from clients which are sent to a central Nagios Server. Passive checks use the NSCA or Nagios Service Check Adaptor which is an add-on for the Nagios Server. You can write custom scripts to evaluate applications and send the output to a central Nagios Server.

CAUTION: This procedure will erase all your router's configuration.

To reset your CISCO router password, you need to access the ROM Monitor mode. To access the ROM Monitor mode, start your minicom and reboot your CISCO router. Upon booting send the CTR+BREAK sequence by pressing CTRL-A F on your keyboard.

This is part two of a three part series on distributed monitoring. You can use passive service and host checks to allow non-central Nagios servers to collect data from a network of machines and then transfer that information to a central Nagios server.

Learning Nagios 3.0 is a comprehensive configuration guide to monitor and maintain your network and systems. It is a practical guide to setting up the Nagios 3.0 open source network monitoring tool, installing and configuring Nagios 3 on various operating systems. It will help understand system monitoring and how Nagios works.

I will assume that you are using GNU/Linux systems (Ubuntu,Debian, CentOS etc.) to configure your CISCO router using CLI.
Open your terminal and install minicom and setserial by typing this command in the terminal.

Cisco announced a Linux-based WiFi router touted as the first 802.11n dual-band clustering access point for small to medium-sized businesses (SMBs). The Cisco AP 541N Wireless Access Point includes 802.11n, gigabit Ethernet, "robust" security, voice roaming, and clustering technology, enabling a single point of administration for multiple access points.

In part one of this series the basic trusses needed by the Nagios check_systemhealth script were put together. In part two the actual checks themselves were coded. In this the third and final part of the series compulsory checks are added, the main loop is constructed and the finall full source listing produced. It is worth noting that this is only one of many methods to achieve the same goal.

When Cisco (NSDQ: CSCO) and Juniper first said they were opening their router OSes, I thought that they'd be about as open as the iPhone. With Cisco's launch of IOS XE, I realize I was wrong: The iPhone is much more open.