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Asked: 2026-05-28T17:43:10+00:00

I’m attempting to use MIB files in PySNMP. The code is fairly straightforward. Nothing

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I’m attempting to use MIB files in PySNMP. The code is fairly straightforward. Nothing complex. Just trying to get the information under an OID. The code I’m using is as follows:

#!/usr/local/bin/python2.7

from pysnmp.smi import builder, view, error
from pysnmp.entity.rfc3413.oneliner import cmdgen

cmdGen = cmdgen.CommandGenerator()
mibBuilder = builder.MibBuilder()
mibPath = mibBuilder.getMibPath() + ( '/path/to/command/mibs', )
mibBuilder.setMibPath( *mibPath )
mibBuilder.loadModules( 
    'MIB-File',
    )
mibView = view.MibViewController( mibBuilder )
errorIndication, errorStatus, errorIndex, \
                 varBindTable = cmdGen.nextCmd( 
    cmdgen.CommunityData( 'Name', 'Community' ),
    cmdgen.UdpTransportTarget( ( 'IP Address', 161 ) ),
    ( ( '', 'serverName' ), ),
    )

print varBindTable

I know the data put into this is accurate as when I use a asynCommandGenerator.asyncNextCmd using the same udpTransportTarget and CommunityData it works without issue. Plus the error I’m seeing is very specific to the MibBuilder Components.

The Error I’m seeing is:

Traceback (most recent call last):

File “./snmpcollectortest.py”, line 11, in

‘NS-MIB-smiv2’,

File “/usr/lib/python2.7/site-packages/pysnmp-4.2.1-py2.7.egg/pysnmp/smi/builder.py”, line 221, in loadModules

pysnmp.smi.error.SmiError: MIB module “/path/to/command/mibs/MIB-File.py” load error: MIB file “ASN1.py[co]” not found in search path

Update:

I found that I didn’t have M2Crypto installed which is why I couldn’t find ASN1.py. However I have corrected this and I’m still getting the same error.

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1 Answer

  1. Editorial Team

    The getMibPath()/setMibPath() methods are obsolete. They don’t work unless you .egg pysnmp or its MIB modules.

    You should always use the getMibSources()/setMibSources() methods instead. These work for both .egg and file-based setup.

    mibPath = mibBuilder.getMibSources() + (builder.DirMibSource('/path/to/command/mibs'),)
mibBuilder.setMibSources(*mibPath)
mibBuilder.loadModules(
    'MIB-File',
)

    BTW, pysnmp does not require M2Crypto, what is required is pyasn1 and pycrypto (for SNMPv3 ciphering only).

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