Best Practices on Campus Network Monitoring. Ljubljana, October Vidar Faltinsen, UNINETT

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1 Best Practices on Campus Network Monitoring Ljubljana, October Vidar Faltinsen, UNINETT

2 We are convinced that most campuses do not take the task of measuring and understanding their traffic flows sufficiently seriously 2 - SERENATE, December 2003

3 Our context The network is complex A lot of equipment Heaps of traffic around the clock No system is perfect Errors will occur incidents will hit us Motto: be proactive and ahead The user should not call you you should be the first to know! Keep in mind: If information is good (posted at the right time, kept up to date) the user is (more) patient! 3

4 Machine and user trackers Report Generator Device History IP Device Info L2 traceroute Network Explorer Detain machines Traffic Maps (geo and topo) Configure switch ports NAVdb Ranked statistics SNMP collector RRD Cricket 4 the network Alert profiles Status Monitor Module Monitor Service Monitor Threshold Monitor Status at a glance SNMP trap external systems SNMP trap or Event Engine Alert Engine SMS jabber

5 Do the most important first For all your equipment: 1. Ping 2. If down => send sms 5

6 Without numbers you are nothing When an incident occurs do you have enough data to investigate and actually pinpoint the cause? Disk is cheap Collect heaps of statistical data Have a scheme for compressing data as time goes (RRD method) Focus on good search tools, reports and visualisation methods to make traffic/statistical anomalies easy to detect Isolation and classification of an error tends to consume most of the recovery time Autodetection of thresholds and more complex anomaly detection is even better Remember to moderate the total flow of alarms (classify alarms) 6

7 Logs are gold, scripts as well Log, log, log Syslog is also a management system Small (shell) scripts can be gold A good idea can be only a few code lines away A culture that motivates creativity, allows continous implementation of new scripts/add-ons will step by step improve the overall management process! 7

8 Avoid a monolithic NMS Not an absolute rule, but be a sceptic If the system is too massive it tends to set the agenda. You should shape the system, not the other way around. If too much resources must be invested into understanding the system then even more resources must be put into accommodating the system to your needs 8 The NMS has no intrinsic value it should be a useful tool for you But remember nothing is for free you must in any case invest in understanding what your tools actually do

9 FCAPS so many tasks to cover Fault management Configuration management Accounting management Performance management Security management 9

10 Not one tool - a set of tools Special purpose tools with limited scope is good Example of tool categories: inventory systems trouble ticket systems status monitors measurements (and threshold monitors) server/services focused netflow analysis security-focused configuration tools simulation Tools should (ideally) not overlap Have a well defined single authority as source for your data sets, i.e.; the set of equipment (with attributes) we manage is defined in one place similarly for our locations (with attributes), etc, etc Autodetection is good But in a controlled environment (be aware of weak SNMPv2 security) 10

11 GC GigaCampus tool boxes Managing 30 campus networks around Norway The tool boxes are servers containing a number of management tools: NAV: Proactive network management nfsen: Netflow traffic analysis Stager: Netflow and Qflow Hobbit: Service monitoring tftp server, syslog server, radius server Stager 11 The tool boxes are placed on campus and used by the local IT staff. Management, tool enhancements, software upgrades, etc, is done by UNINETT. Free training in tool usage is given. nfsen

12 NAV Network Administration Visualized Network management system developed by UNINETT and NTNU since Key features Inventory information with topology topology autodetected L3, L2, per vlan Status monitor with alarm system sms and alarms Client machine tracking based on ARP and bridge table data Client machine detention Statistics and graphing 12 Get NAV Free software GPLv2 Debian package ++ Virtual appliance available

13 The service monitor Hobbit 13 Agent on servers that reports on the local status Monitors CPU load, disk usage, memory, processes running and whatever you script Servers are organized in groups. Alarms are showed on a per group basis. Drill down to details of when an alarm occured and reported reason

14 Use a single event/alarm system 14

15 Place your monitor strategic A monitor placed in the periphery of your network is more likely to be cut off place in a central (network wise) location redundant network access (VRRP, HSRP ) Redundant power, incl redundant source of source (UPS/ideally standby generator) Monitor the monitor! Use SMS for alarms in addition to Place the SMS sending device physically connected to the NMS 15

16 Adopt good naming standards Do not underestimate the value of sound names for your equipment, rooms and locations The name of the device should in itself give an idea of what the device is (does) and where it is placed Example: mtfs-272-sw (a switch in area mtfs, wiring closet 272 ) Also use a thought-through naming standard for router interfaces and switch ports 16

17 NMS Security Restrict access to NMS to authorized crew only both network access and physical access Isolate management IP address of switches and base stations to dedicated subnets Firmly restrict SNMP access to the network equipment only from the NMS(es). remember SNMP v2 security is weak Be even more restrictive if you allow/use SNMP Write consider SNMP v3 or Netconf 17

18 MIB requirements for your equipment Your network equipment should support: RFC 3418: SNMPv2-MIB (system) RFC 2863: IF-MIB (interfaces, incl. 64 bit counters) RFC 4293: IP-MIB (IP-interfaces and ARP; IPv4 and IPv6) RFC 4133: ENTITY MIB (modules, optics, software, serial numbers) Not supported by Juniper RFC 4188: BRIDGE-MIB (bridge table) RFC 4363: Q-BRIDGE MIB (bridge table per vlan, vlan config) Not supported by Cisco RFC 3635: Etherlike-MIB (duplex) RFC 2368: MAU-MIB (medium) equipment support seems scarse (HP has support) 18 Your NMS should whenever possible use standard/ietf MIBs rather than vendor proprietory MIBs

19 Key points in summary Be proactive Detect important alarms early Inform the users Log, log, log (snmp collect) Use a number of tools Adopt good naming standards Value the engineer small scripts are gold Educate your crew! (in both NMS operations and procedures) 19

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