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Garbaged SNMP values (tools)
----------------------------
Q. When fetching data with snmp*.py command-line tools, some values
do not print out nicely:
.. code-block:: bash
$ snmpget.py -v2c -c public 127.0.0.1 .1.3.6.1.4.1.14988.1.1.1.2.1.1.0.23.183.34.8.200.3
SNMPv2-SMI::enterprises.14988.1.1.1.2.1.1.0.23.183.34.8.200.3 =
OctetString: ˇČ
where Net-SNMP gives nicely formatted human-readable string:
.. code-block:: bash
$ snmpget -v2c -c public 127.0.0.1 .1.3.6.1.4.1.14988.1.1.1.2.1.1.0.23.183.34.8.200.3
SNMPv2-SMI::enterprises.14988.1.1.1.2.1.1.0.23.183.34.8.200.3 =
Hex-STRING: 00 17 B7 22 08 C8
What can be done to PySNMP to make it returning HEX data in human-readable?
A. The difference is that Net-SNMP prints values into hex by-default,
whereas pysnmp does not do that. You can force snmpget.py to work
similarily with the -OT command line parameter.
.. code-block:: bash
$ snmpget.py -OT -v2c -c public 127.0.0.1 .1.3.6.1.4.1.14988.1.1.1.2.1.1.0.23.
183.34.8.200.3
SNMPv2-SMI::enterprises.14988.1.1.1.2.1.1.0.23.183.34.8.200.3 =
OctetString: 00 17 b7 22 08 c8
Another matter is MIB lookup - when snmp*.py tool can use a MIB to figure
out what are the display conventions for particular value type, it will
reformat the value in a human-readable form.
To let MIB lookup work, please pass appropriate MIB name to snmp*.py
tool through command line:
.. code-block:: bash
$ snmpwalk.py -m IP-MIB,IF-MIB -v2c -c public 127.0.0.1 .1.3.6.1.4.1
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