1. OPEN SOURCE NETWORK MANAGEMENT TOOLS
The Sixth Meeting

2. Overview
Introduction
NOC Philosophy
Available Tools

3. INTRODUCTION
Wikipedia: “A network operations center (or NOC, pronounced “nock”) is one or more locations from which control is exercised over a computer, television broadcast, or telecommunications network.”

4. FUNCTIONS OF A NOC
Responsible for monitoring the network for alarms or adverse conditions (e.g. power failures, link failure)
NOC staff analyze problems, troubleshooting, collaborate with other technicians on site.
NOC tracks issues/problems until they are resolved.
Problems not solved within a specified time frame can be escalated to the appropriate personnel.
Standard Operating Procedures exists that detail how to remedy issues/problems.

5. NOC PHILOSOPHY (Adapted from RedHat documentation) Automate everything
Document everything
Communicate as much as possible
Know your resources
Know your users
Know your business
Security cannot be an afterthought
Plan ahead

6. PURPOSE
Policies
Faults
&
Issues
Configuration
Management
Accounting
Communication
Security
Performance
Monitoring
NOCs are dedicated to monitoring and coordinating network operations.
This requires that the following functional areas are addressed:

7. Multi Router Traffic Grapher (MRTG)
AVAILABLE TOOLS
Multi Router Traffic Grapher (MRTG)
Based on SNMP
Used to monitor traffic load on network links.
Many hacks exist to allow you to monitor other things (e.g. incoming / outgoing s, cache hits and misses)

8. MRTG

9. Weathermap 4RRD Generates network weather maps.
Shows the network link utilization on the network map by color scheme
Data used to create graph are acquired from RRDTool databases or MRTG HTML files

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12. Nagios http://www.nagios.org/
an enterprise-class network and server monitoring system.
Useful for:
Monitoring of network services.
Monitoring of host resources (processor load, disk usage, system logs)
Contact notifications when service or host problems occur and get resolved (via , SMS).
You can define event handlers that execute when triggered by certain events. (Proactive problem resolution)

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OpenNMS
Functionalities
High performance
A single instance of OpenNMS supports monitoring of a large number of nodes.
Automation
OpenNMS minimizes the amount of manual configuration.
Rule-based configuration
Flexible rules can be used to specify what services are polled on what devices.
ENMS also discovers and maps the physical and logical connections between these devices
Layer 2 discovery, including Ethernet switches, interconnecting links, switch communities, VLANs, and VLAN membership
Layer 3 discovery of network elements and interconnecting links
Layer discovery of Ethernet Routing Switch 8600 WSM network elements and interconnecting links
End node discovery of devices such as servers and workstations attached to the network, including Communication Server 1000 IP telephony devices

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20. ZABBIX http://www.zabbix.com Functionalities Performance monitoring
User alerts
Monitoring of log files
Logging services
Capacity planning
Assuring and monitoring of SLA
High level view of IT resources and services
Graphical representation of collected information
Network maps

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22. Cacti http://www.cacti.net Similar to MRTG. Based on RRDtool.
Offers excellent graphing capabilities.
Has extensive templates.

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27. NTop
Network probe that shows network activity just like “top”.

31. Request Tracker http://bestpractical.com/rt/
Tracks data/conversations/requests.
Convenient for end users.
Highly customizable.
Easy to install (hmm…)
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35. Security Tools Some security tools to consider:
NetFilter IP Tables – Firewall
WireShark – Protocol analyzer
Snort – Intrusion detection
Netcat – Feature rich tool. Great for debugging.
Nessus – Vulnerability scanner
Many many more…
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36. Recommended Reading
Practice of System and Network administration by Thomas A. Limoncelli
How to accelerate your Internet E-book
Red Hat Linux Network Management Tools (CD-ROM included) (Paperback) By Steven Maxwell.
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