Network Monitoring #BersihBersihHD

1. Training Cakru ARC ITB, 3/05/2015

2. Nur Adhi Nugroho
Fisika
(+62)81-329-826-110
nur.adhi21@gmail.com (all in one :D)
nur.adhi@staff.itb.ac.id (private)
nur.adhi@arc.itb.ac.id (ARC’s stuff only)

3. http://www.loriotpro.com/Images/
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ITB Topology - Internet Connectivity 2015

4. Overview
 Apa itu Network Monitoring
 Apa itu Network Management
 Kenapa perlu Network Monitoring and Management
 The Big Picture
 SNMP

6. Network Management
We monitor
 System and Services
reachable, available
 Resources
maintain availability
 Performance
throughput
 Changes and Configuration
logging, documentation, revision control

7. Network Management
We keep track of
 Statistics
 Faults
 Ticketing Systems

8. Why we do this?
 Know when to upgrade
bandwidth, device, etc
 Keep an audit trace of changes
record all changes
find problems due to upgrades and configuration
changes
 Maintain history of network operation
keep history of event

9. Why Network Management
 Accounting
track usage of resources
 Know when you have problem
generate tickets & automatically notify staff of issues
 Trends
monitoring helps you view trends across your network

10. The Big Picture

11. Network Monitoring System
A few open source
 Cacti
 Nagios
 Rancid
 GestioIP
 etc

12. SNMP
 Simple Network Management Protocol
 UDP protocol
 Port 161

13. SNMP Roles
 Manager (Network Management Systems/the
monitoring station)
 Agent (SNMP agent on the managed device)

14. Querying SNMP Agent
Some typical command for querying
 snmpget
 snmpwalk
 snmpstatus
 Snmptable
Syntax
snmpxxx –c community –v1 host [oid]
snmpxxx –c community –v2c host [oid]

15. SNMP Failure: No Response
 Unreachable or offline
 There isn’t SNMP agent running on the managed
device
 Configure with a different community string
 Your IP address not allowed on configuration

16. Reference
 Workshop APRICOT 2015