Network Monitoring. Sebastian Büttrich, NSRC / IT University of Copenhagen Last edit: February 2012, ICTP Trieste
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1 Network Monitoring Sebastian Büttrich, NSRC / IT University of Copenhagen Last edit: February 2012, ICTP Trieste
2 Agenda What is network monitoring? The big three Other useful tools and systems Questions and discussion 2
3 Remember the layer model 3
4 Remember the layer model General Network monitoring mostly works on layer 3 and up, and often assumes TCP/IP networks Wireless network monitoring typically involves layer 2 - the 4 specifically wireless aspects (spectrum, SSIDs, etc)
5 What are we monitoring? Connections, links, quality bandwidth, usage performance systems & services resources configurations, changes logfiles users? content of traffic? 5
6 Monitoring & Management Monitoring without response does not make much sense what good is seeing a problem if you dont react? Monitoring is part of management Management is closely related to expectations, contracts, SLAs 6
7 Different types of monitoring human operated vs automatic active vs passive Active human operated monitoring often gives good insight, but is not feasible 24/7 Automatic monitoring can run 24/7, but needs to trigger notification/alerts and file service tickets in order to be useful Often the combination of both is needed. 7
8 The big three Nagios servers, switches, devices, services & anything that can talk IP and/or SNMP (this can include small wireless sensors!) Smokeping connections, quality, ping rtt, latency, jitter Cacti resources, traffic, interfaces, transactions,.. almost anything that is accessible via SNMP, e.g. temperature, power,... sensor data 8
9 Nagios Nagios is an open source computer system monitor, network monitoring and infrastructure monitoring software application. Nagios offers monitoring and alerting for servers, switches, applications, and services. It watches hosts and services, alerting users when things go wrong and again when they get better. (source: wikipedia) 9
10 Nagios 10
11 Nagios 11
12 Nagios how to get started? For example by using the NSRC exercises:
13 Smokeping Smokeping is a network latency monitor. It measures network latency rtt, jitter - to a configurable set of destinations on the network, and displays its findings in easyto-read Web pages. SmokePing uses RRDtool as its logging and graphing back-end, making the system very efficient. The presentation of the data on the Web is done through a CGI with some AJAX capabilities for interactive graph exploration. (source: freshmeat) 13
14 Smokeping 14
15 Smokeping 15
16 Smokeping 16
17 Smokeping 17
18 Smokeping 18
19 Smokeping how to get started? For example by using the NSRC exercises:
20 Cacti Cacti is an open source, web-based graphing tool designed as a frontend to RRDtool's data storage and graphing functionality. Cacti allows a user to poll services at predetermined intervals and graph the resulting data. It is generally used to graph time-series data of metrics such as CPU load and network bandwidth utilization. A common usage is to monitor network traffic by polling a network switch or router interface via SNMP. (source: wikipedia) 20
21 Cacti 21
22 Cacti 22
23 Cacti 23
24 Cacti 24
25 Cacti Cacti is a good tool for monitoring power e.g. solar installations as it can monitor electrical and environmental data 25
26 Cacti how to get started? By now you can guess :)
27 SNMP Simple Network Management Protocol (SNMP) is an "Internet-standard protocol for managing devices on IP networks. Devices that typically support SNMP include routers, switches, servers, workstations, printers, modem racks, and more."[1] It is used mostly in network management systems to monitor network-attached devices for conditions that warrant administrative attention. SNMP is a component of the Internet Protocol Suite as defined by the Internet Engineering Task Force (IETF). It consists of a set of standards for network management, including an application layer protocol, a database schema, and a set of data objects. [2] SNMP exposes management data in the form of variables on the managed systems, which describe the system configuration. These variables can then be queried (and sometimes set) by managing applications.. (source: wikipedia) 27
28 Other useful tools Command line tools: mtr ping and traceroute nmap port scanning Iperf command line client-server tests # iperf c Client connecting to , TCP port 5001 TCP window size: 16.0 KByte (default) [ 3] local port connected with port 5001 [ ID] Interval Transfer Bandwidth [ 3] sec 24.3 MBytes 20.4 Mbits/sec 28
29 Other useful tools Wireshark: advanced packet dumper 29
30 Other useful tools Etherape: visualization toy, but a nice toy :) 30
31 Other useful tools Huge performance suite: perfsonar Traffic, bandwidth: bandwidthd Router config management: Rancid Network Documentation: Netdot Intrusion Detection: tripwire, snort Vulnerabilities: Nessus, OpenVAS 31
32 And... There are dozens of others but I really have to go to bed now :) Questions? You tell me what you would like to monitor and we find the right tool for it! 32
33 Other useful tools Huge performance suite: perfsonar Traffic, bandwidth: bandwidthd Router config management: Rancid Network Documentation: Netdot Intrusion Detection: tripwire, snort Vulnerabilities: Nessus, OpenVAS 33
Details. Some details on the core concepts:
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