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diff --git a/docs/source/faq/non-printable-snmp-values-tools.rst b/docs/source/faq/non-printable-snmp-values-tools.rst new file mode 100644 index 0000000..89671e2 --- /dev/null +++ b/docs/source/faq/non-printable-snmp-values-tools.rst @@ -0,0 +1,44 @@ + +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 |