Computer Networks
Tutorial #17
- How would you request a router to return the actual values of the
objects ipForwarding, icmpInEchoes and
tcpMaxConn? Give solutions using each of the
get and get-next commands. Use
a command syntax of your choice, although the CMU SNMPlib
syntax given in the
lecture notes
would be the most appropriate.
- The following is a diagrammatic view of portion of a table
(ifTable) in the interfaces portion of the standard MIB,
edited to fit the page. The table consists of a sequence of
ifEntry elements. Values shown are from the router
r-bgowan at Bendigo.
- Describe interface 3 on this router.
- What would be the structure of an SNMP
get-request to discover the speed, in bps,
of interface 1.
- What value would be returned by
get-next(...ifSpeed.2)?
- Why do SNMP proponents use the expression
"powerful get-next"? In other words, what problem
does the get-next operation solve very elegantly?
- (Philosophical question) What is the purpose of the SNMP portion of
the MIB?
Practical exercises:
- Use tkined to discover routes to selected Internet hosts
and display the network map. Investigate some of the (very powerful
and fully industrial strength) functions available in
tkined.
- Use the CMU SNMP utilities in the directory /usr/local/snmp on
our Unix systems. Try fetching the MIB variable
system.sysDescr.0 from various departmental systems, and thus
learn which are running SNMP.
- One of the current Big New Things is the integration of SNMP, and
network management in general, with the WWW. You can see an excellent
example of this at the URL
http://ironbark.bendigo.latrobe.edu.au/information/mrtg/
Have a look. Of particular interest is the ATM (microwave)
link between Bendigo and Bundoora!
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Phil Scott