SNMP. Simple Network Management Protocol
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1 SNMP Simple Network Management Protocol
2 Introduction SNMP Simple Network Management Protocol A set of standards for network management Protocol Database structure specification Data objects A set of standardized tools that Control costs of network management Across various product types End system, bridges, routers, telecommunications, History In 1989 SNMP was adopted as TCP/IP-based Internet standards In 1991 RMON Remote network MONitoring Supplement to SNMP to include management of LAN and LAN devices In 1995 SNMPv2 Functional enhancements to SNMP SNMP on OSI-based networks RMON2 In 1998 SNMPv3 Further enhancements Security capability for SNMP 2
3 Requirements of Network Management Fault Management Detect, isolate, reconfigurate and repair the abnormal network environment Problem tracking and control Problem is truly resolved and no new ones are introduced Accounting Management Track the use of network resources by end user to provide Impropriate usage tracing, charging, statistics Configuration and Name Management Startup, shutdown, reconfigure network component when Upgrade, fault recovery or security checks Performance Management Capacity utilization, throughput, response time, bottleneck Collect information and assess current situation Security Management Information protection and access control 3
4 Network Management System (1) A collection of tools for Network monitoring Network control These tools must be integrated Single operator interface with powerful but user-friendly Support of managed equipments. 4
5 Network Management System (2) Architecture of NMS NMA NME Operator interface Collect statistics Response to NMA Alert NMA when environment changing 5
6 Network Management Software Architecture Presentation SW Unified interface and handle information overload Network Management SW NM applications Admin interested tools Fault, security, accounting management Application element Primitive and general-purpose NM functions Generating alarm, summarizing data Communication SW Exchange management information Communication protocol stack Database SW MIB (Management Information Base) Configuration and behavior Operation parameters MIB access modules Convert local MIB to standard form 6
7 SNMP Network Management Concepts
8 In that time.. Network environment is simple ICMP is the only way to do network investigation ping, traceroute,. As Internet goes popular, three approaches are proposed: HEMS: High-level Entity Management System Considered to be the first network management tools SGMP and SNMP SNMP was an enhanced version of the Simple Gateway Management Protocol For TCP/IP-based network management standards Supposed to be short-term solution CMIP over TCP/IP (CMOT) Common Management Information Protocol For ISO-based network management standards Supposed to be long-term solution 8
9 Network Management Architecture in SNMP (1) 4 key elements Management Station Serve as the interface between manager and devices Management applications User-friendly interface Translate manager s requirements into actual monitoring or control operations Database extracted from MIBs of all managed device Management Agent Respond to request from management station Change settings in MIB of managed device Asynchronously report abnormal event (Trap) Management Information Base (MIB) Each resource is represented as an object and MIB is a collection of objects Network Management Protocol get, set, trap 9
10 Network Management Architecture in SNMP (2) 10
11 Network Management Architecture in SNMP (3) SNMP proxy Devices that do not support UDP/IP ex: Bridge, Modem Devices that do not want to add burden of SNMP agent ex: PC, programmable controller 11
12 SNMP Message Information Message Information Base (MIB) Collection of objects and Each object represents certain resource of managed device Interoperability of MIB Object that represents a particular resource should be the same cross various system What objects MIB-I and MIB-II Common representation format SMI (Structure of Management Information) 12
13 SNMP Message Information SMI (1) SMI (RFC 1155) Structure of Management Information Identify the data type that can be used in MIB and how resources are represented and named, including MIB structure Syntax and value of each object Encoding of object value 13
14 SNMP Message Information SMI (2) MIB structure Rooted tree The leaves are the actual managed objects Each object has an identifier (OBJECT IDENTIFIER) Number with dot as delimiter The internet node iso -> org -> dod -> internet object identifier of internet node: Under internet node directory :OSI X.500 directory mgmt: used for objects defined in IAB (Internet Activities Board) experimental: used for internet experiments private: unilaterally usage 14
15 SNMP Message Information SMI (3) MIB Tree Define additional objects Under mib-2 Under experimental Under enterprises 15
16 SNMP Message Information Object Syntax (1) Definition of object Data type Application-independent type (UNIVERSAL type) integer, octetstring, null, object identifier, sequence Application-wide types (RFC 1155) Networkaddress IP Address counter (0 ~ ), increasing only, wrap to 0 gauge (0 ~ ) timeticks opaque (encoded as OCTET STRING for transmission) threshold Value ranges Relationship with other objects in MIB 16
17 SNMP Message Information Object Syntax (2) ANS.1 Abstract Syntax Notation One A formal language developed by CCITT and ISO In SNMP, we use macro to define other types used to define managed objects Macro definition (template) Macro instance (particular type) Macro instance value 17
18 SNMP Message Information Object Syntax (3) OBJECT-Type macro 18
19 SNMP Message Information Object Syntax (4) Example of object definition iso.org.dod.internet.mgmt.mib-2.tcp.tcpmaxconn
20 SNMP Message Information Object Syntax (5) 2-D table Two-dimensional array with scalar-valued entries Ex: tcpconntable (RFC1213) 20
21 SNMP Message Information Object Syntax (6) 21
22 SNMP Message Information Object Syntax (7) iso (1) -> org (3) -> dod (6) -> internet (1) -> mgmt (2) mib-2 (1) -> tcp (6) -> tcpconntable(13) 22
23 Standard MIBs
24 MIB-II II (1) RFC1213 MIB-I (RFC 1156) MIB-II is a superset of MIB-I with some additional objects and groups 24
25 MIB-II II (2) First layer under mib (iso.org.dod.internet.mgmt.mib-2) system Overall information about the system interfaces Information about each interface at internet-to-subnet address mapping ip, icmp, tcp, udp, egp dot3 Transmission schemes and access protocol at each system interface snmp 25
26 MIB-II II system group sysservices 1 physical (ex: repeater) 2 datalink/subnetwork (ex: bridge) 3 internet (ex: router) 4 end-to-end (ex: IP hosts) 7 applications (ex: mail relays) 26
27 MIB-II II interface group (1) 27
28 MIB-II II interface group (2) 28
29 MIB-II II tcp group Computer Center, CS, NCTU 29
30 MIB-II II ip group Computer Center, CS, NCTU 30
31 Simple Network Management Protocol RFC 1157
32 SNMP Protocol Supported operations get, set, trap Simplicity vs. limitations Not possible to change the structure of MIB by adding or deleting object instances Access is provided only to leaf objects Not possible to access entire table or row in single action 32
33 SNMP Protocol security concern In management environment The management station and managed agent One-to-many relationship One station may manage all or a subset of target The managed station and management station One-to-many relationship Each managed agent controls its local MIB and must be able to control the use of that MIB Three aspects Authentication service Access policy Proxy service 33
34 SNMP Protocol communities (1) An SNMP community A relationship between an SNMP agent and a set of SNMP managers that defines Authentication, access control and proxy The managed system establishes one community for each combination of authentication, access control and proxy Each community has a unique community name Management station use certain community name in all get and set operations 34
35 SNMP Protocol communities (2) Authentication The community name (password) Access policy Community profile SNMP MIB view A subset of MIB objects SNMP access mode READ-ONLY, READ-WRITE 35
36 UC Davis SNMP agent
37 UCD SNMP agent (1) /usr/ports/net-mgmt/net-snmp To Install: make NET_SNMP_SYS_CONTACT = "chwong@cs.nctu.edu.tw" \ NET_SNMP_SYS_LOCATION = "NCTU EC318" \ install clean Firewall rules to restrict access to port 161 After installation, use snmpconf -g basic_setup It will generate snmpd.conf move it to /usr/local/etc/snmp/ 37
38 UCD SNMP agent (2) snmpconf % man snmpd System Information Setup Location, contact, service Access Control Setup SNMPv3 or SNMPv1 access community Trap Destination Where to send the trap Monitor Various Aspects of the Running Host Process, disk space, load, file Extending the Agent Let snmp agent to return information that yourself define Agent Operating Mode User/group, IP port, 38
39 UCD SNMP agent (3) To get various value man snmpget, snmpgetnext, snmptable % snmpget -c public -v 1 nabsd system.syscontact.0 % snmpgetnext c public v 1 nabsd system.syscontact.0 % snmptable -c public -v 1 nabsd mib-2.tcp.tcpconntable % snmpwalk c public v 1 nabsd system % snmpwalk -c public -v 1 nabsd iso.org.dod.internet.private.enterprises 39
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