Henric Johnson1 Chapter 12 Network Management Security Henric Johnson Blekinge Institute of Technology, Sweden

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Henric Johnson1 Chapter 12 Network Management Security Henric Johnson Blekinge Institute of Technology, Sweden

Henric Johnson2 Outline Basic Concepts of SNMP SNMPv1 Community Facility SNMPv3 Recommended Reading and WEB Sites

Henric Johnson3 Basic Concepts of SNMP An integrated collection of tools for network monitoring and control. –Single operator interface –Minimal amount of separate equipment. Software and network communications capability built into the existing equipment SNMP key elements: –Management station –Managament agent –Management information base –Network Management protocol Get, Set and Notify

Henric Johnson4 Protocol context of SNMP

Henric Johnson5 Proxy Configuration

Henric Johnson6

7 SNMP v1 and v2 Trap – an unsolicited message (reporting an alarm condition) SNMPv1 is ”connectionless” since it utilizes UDP (rather than TCP) as the transport layer protocol. SNMPv2 allows the use of TCP for ”reliable, connection-oriented” service.

Henric Johnson8 Comparison of SNMPv1 and SNMPv2 SNMPv1 PDUSNMPv2 PDU Direction Description GetRequest Manager to agentRequest value for each listed object GetRequest Manager to agentRequest next value for each listed object GetBulkRequestManager to agentRequest multiple values SetRequest Manager to agentSet value for each listed object InformRequestManager to manager Transmit unsolicited information GetResponseResponseAgent to manager or Manage to manager(SNMPv2) Respond to manager request TrapSNMPv2-TrapAgent to managerTransmit unsolicited information

Henric Johnson9 SNMPv1 Community Facility SNMP Community – Relationship between an SNMP agent and SNMP managers. Three aspect of agent control: –Authentication service –Access policy –Proxy service

Henric Johnson10 SNMPv1 Administrative Concepts

Henric Johnson11 SNMPv3 SNMPv3 defines a security capability to be used in conjunction with SNMPv1 or v2

Henric Johnson12 Recommended Reading and WEB Sites Subramanian, Mani. Network Management. Addison-Wesley, 2000 Stallings, W. SNMP, SNMPv1, SNMPv3 and RMON 1 and 2. Addison- Wesley, 1999 IETF SNMPv3 working group (Web sites) SNMPv3 Web sites