SNMP (Simple Network management protocol)

1
SNMP(Simple Network management protocol)
2
??

• ??
• SNMP ????
• SNMP ??? TCP/IP ?? ????
• SNMP Protocol
• MIB(Management Information Base)
• WAN ???? SNMP? ???
• SNMPv1 ? SNMPv2? ???
• SNMPv3

3
??

• NMS(Network Management System)?? ?? ????? ????
  ??????.
• Cisco(Ciscoworks), HP(Openview),
  3COM(Viwbuilder)?
• SNMP? ??? ?? ???? ??? ?? ???? Network?? ?????
  ???.
• TCP/IP? ??? ???? ?? ???? ???? ?? ???? ?? ??? ???
  ???? ???? ?? ??? ?? ????(SNMPSimple Network
  Management Protocol)? ????. - RFC 1157

4
SNMP ????(1/2)

• ICMP ???? ??
• Agent? ??? ??? ?? ??
• ????? ???? ???? ?? ???? ????? ??? ?????? ???? ???
  ????? ??

5
SNMP ????(2/2)

• SGMP(Simple Gateway Management Protocol)
• Gateway? ?????? ???? ?? ??
• HEMS(High-Level Entity Management System)
• ??? ??? ?? ??? HMP(Host Monitoring Protocol)
• SNMP(Simple Network Management Protocol)
• SGMP? ?? version, ?? ??
• CMOT(CMIP over TCP/IP)
• ISO? ???? ??? ?? ???? protocol. Service,
  database? ??

6
SNMP??? TCP/IP ?? ??(1/2)

• ?? ????
• Management Station
• NMS(Network Management System) server
• Managed Agent
• Management Station? ?? ???? ? ? ?? ??
• MIB(Management Information Base)
• ??? ??? traffic ??? ???? ??? ? ??? ?? object ? ??
• SNMP(Simple Network Management Protocol)
• Management Station? Agent? traffic ??? ???? ?
  MIB??? ?? ? ?? ?? ????

7
SNMP??? TCP/IP ?? ??(2/2)
8
SNMP Protocol(1/7)

• Snmp ???
• get-request manager? Agent?? ?? ?? ? ??? ?? ??
  ????.
• get-next-requestmanager? Agent?? ?? ?? ? ??? ???
  ??? ?? ??? ??? ??.
• set-requestmanager? ??? ?? ????.
• get-response Agent? manager?? ?? ?? ? ??? ??? ??
  ???? ????.
• trapAgent ??? ?? ?? ????? manager?? ???.

9
SNMP Protocol(2/7)

• snmp ???? ??

10
SNMP Protocol(3/7)

• SNMP message format

11
SNMP Protocol(4/7)

• SNMP message format

12
SNMP Protocol(5/7)
PDU ?? ??
0 Get-request
1 Get-next-request
2 Get-response
3 Set-request
4 trap

• SNMP message? PDU ??

13
SNMP Protocol(6/7)

• SNMP error status

14
SNMP Protocol(7/7)

• Trap type(06)

15
MIB(Management Information Base)(1/3)

• ???? ?? ?? ???
• ???? ????? ??? ? ?? ?? ??? ????? Agent ? ????.
• System, interfaces, at(????), ip, icmp, tcp,
  udp?? ??? ??.

16
MIB (Management Information Base)(2/3)

• Object identifier
• ??? ??? ???? ??? ??
• 10? ???? ?? ???? ???? ??
• ??? ? ??? ?? ??? ????.
• ex) iso.org.dod.internet.mgmt.mib
• ???? Agent ??? ???? ??? ?? MIB?? ???
• ??? ? ?????.
• ex) 1.3.6.1.2.1

17
MIB (Management Information Base)(3/3)
dod(6)
Enterprise(1)
1.3.6.1.2.1

• MIB??? Object identifier

18
WAN???? SNMP? ???

• ???? ?? ??? ?? ??? ???? ???.
• SNMP? ???? ???? ???? ???? ????? ? ?? ??? ???????
  ???? ?? ???? ???? ???? ?? ? ? ??.
• ?? ???? ????? ??, ???? ??? ???? ??.
• SNMP Agent? ?? ?? ???? ??? ?? ? ??? ??? ??? ????
  ?? Agent? ??? ??? ???? ?? ? ??? ??? ?? ? ???, ???
  ??? ???? ?? ?? ??? ? ? ??.

19
SNMPv2

• SNMP? ??? ???? ??
• Secure SNMP SMP SNMPv2(1993.3)
• ??? proposal? ??? security ??? ????
  security??? ???? ??
• Community-based SNMPv2(1996.1)
• ????? UDP ?? ???
• OSI Connectionless Network Services(CLNS)
• AppleTalks Datagram Delievery Protocol(DDP)
• Novells Internetwork Packet Exchange(IPX) ??
  ??? ? ??? ??.

20
SNMPv1? v2? ???

• Get-bulk-request
• Manager? ??? ???? ????? ????? ?? ???
• Inform-request
• Manager? ?? manager?? ??? ???? ?? ???
• Manager-to manager communication

21
SNMP v3

• SNMP v3
• ???? ??
• Authentication
• Encryption