The Campus NMS tool NAV GN3 Network monitoring workshop Belgrade, 20th October 2009 Morten Brekkevold
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1 The Campus NMS tool NAV GN3 Network monitoring workshop Belgrade, 20th October 2009 Morten Brekkevold
2 What is NAV? Network Administration Visualized A network monitoring software system Free software, licensed under GPLv2 Developed in Norway to meet the requirements of campus network operators in Norwegian higher education Focused on network infrastructure 2
3 1999: Inception 3 Need to monitor the campus network HP OpenView tested and thrown out Internal development of tailored tools began
4 Early features Collect router port data (SNMP) Auto-create MRTG/Cricket config Status monitor (ping) with alerts ARP collector Web reports and topological traffic map SNMP trap daemon with alerts 4
5 2001: Enter UNINETT Sponsoring 50% of development costs Contingent on results being made available for all Norwegian universities and university colleges Resulted in version 2, released in
6 2004: Freedom GPL chosen as license Version 3 released to the world 6
7 2006: GigaCampus Four new years of funding UNINETT became lead developer of NAV 7
8 Today An estimated 35 universities and university colleges in Norway use NAV (nearly all) 30 of these local installations operated centrally by UNINETT Reported usage from universities and businesses in Italy, Romania, Russia, Switzerland, UK, USA and Denmark 188 subscribers to the nav-users mailing list 8
9 What does it do? Inventory & topology Status monitoring & alerts Client machine tracking and detention Statistics and graphing 9
10 IP Device Info Network explorer Netmap Cricket Reports PostgreSQL 10 RRD RRD RRD Machine tracking and detention Status monitor Service monitor Threshold monitor SMS External systems event & alert engines Jabber
11 Maintenance processes Network access processes maintengine mactrace logengine networkdiscovery PostgreSQL getdevicedata 11 snmptrapd thresholdmon eventengine RRD RRD RRD pping servicemon alertengine Cricket smsd
12 Web interface 12
13 Start monitoring No device autodiscovery Seed the database getdevicedata getdevicedata getdevicedata 13 PostgreSQL
14 Inventory For each device, get: Modules Serial numbers Interfaces IP addresses and prefixes IPv4 and IPv6 14
15 getdevicedata Plugin based SNMP collector Data is collected from devices in parallel, using threads Collects full inventory every 6 hours, by default Module monitor plugin is invoked every hour, by default 15
16 IP Device info 16
17 Reports Admin-configurable tabular reports SQL-based 17
18 Address space matrix Allocation Utilization 18
19 Autodetecting topology Physical topology ARP CAM CDP VLAN topology Trunks STP Machine tracking and detention 19
20 Netmap 20
21 Network explorer 21
22 Geomap 22
23 Traffic statistics NAV autoconfigures Cricket A third party tool for collecting and displaying time-series data, using RRDtool We poll interface counters, CPU load values, memory usage, temperature, etc. 23
24 Events and alerts thresholdmon snmptrapd servicemon modulemon (gdd) pping MailIn Event queue 24 topology data eventengine Alert queue Alert history alertengine Web status report
25 Withholding alerts Shadow Uses topology to see that a device is unreachable because of another device being down Scheduled maintenance Purposely withhold alerts from devices on scheduled maintenance 25
26 Alert profiles Each user can have multiple personal alert profiles A profile defines: What alerts to subscribe to When to receive said alerts Where to receive said alerts 26
27 Profile example 27
28 Syslog analyzer 28
29 Campus abuse handling NAV offers two useful and popular tools for campus abuse handling Client machine tracking Client machine detention Why are these popular? Student villages often connected directly to university network Students are naughty 29
30 Client machine tracking NAV logs CAM table entries for all switch access ports Using the combination ARP (and IPv6 neighbor discovery) & CAM, any client machine's access port can be found from its IP address Similarly, we can count or list the number of active end users on a switch 30
31 Tracking example 31
32 Client machine detainment Given an IP address, we can: Block the client machine's access port (interface shutdown) Switch access port to a quarantine VLAN with limited access 32
33 Detention case history Complete case history Detention reason Target MAC address Option to pursue detainee Option to automatically repeal detention after set time has passed 33
34 Automated detention runs Scan client IP ranges for vulnerabilities known to disrupt network Feed list of vulnerable IP addresses to NAV, supplying a reference reason Clients are blocked according to preconfigured settings in reference reason 34
35 Implementation Began as hodge-podge mix of scripts First use Perl and PHP Add some Java Then some more Java Then throw in Python for good measure What a mess!? 35
36 Development model Many summer interns (students) More than 30 people involved over a span of 10 years of development Always a new favorite programming language Turnaround is a problem for code maintenance 36
37 Integration and cleanup Since 2003, new programming languages were forbidden Code cleanup, rewrites and encouraging API building Reducing number of languages PHP is out Perl is almost out (1 program left) Java accounts for nearly 50%, but is very slowly on its way out 37
38 Active developers UNINETT 1 full-time employee (me) 4 part-time students NTNU University of Tromsø 1 person, 25% of the time 2 people, ad-hoc University of Oslo Packaging for Debian GNU/Linux 38
39 Development tools Launchpad Mercurial Distributed version control Emacs, Vim, Eclipse, etc. Sympa Bug and specification tracking Mailing list software Dokuwiki Wiki-based web site 39
40 Future plans Currently working on next-generation collection framework Working on improved environment and UPS monitoring LLDP support for topology Integrate Geomap SNMPv3 and/or Netconf 40
41 That's it, folks!
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