# MIB tweaks

## Waive MIB lookup

Perform SNMP GETNEXT operation with the following options:

- with SNMPv2c, community ‘public’

- over IPv4/UDP

- to an Agent at demo.snmplabs.com:161

- for an OID in string form

- do not resolve response OIDs and values into human-freidly form

False lookupMib keyword arguments could make pysnmp waiving OIDs and values resolution in response variable-bindings, into human friendly form.

Functionally similar to:

$ snmpwalk -v2c -c public -ObentU demo.snmplabs.com 1.3.6.1.2.1

    from pysnmp.hlapi import *

    for (errorIndication,
         errorStatus,
         errorIndex,
         varBinds) in nextCmd(SnmpEngine(),
                              CommunityData('public'),
                              UdpTransportTarget(('demo.snmplabs.com', 161)),
                              ContextData(),
                              ObjectType(ObjectIdentity('1.3.6.1.2.1.1')),
                              lookupMib=False):

        if errorIndication:
            print(errorIndication)
            break
        elif errorStatus:
            print('%s at %s' % (errorStatus.prettyPrint(),
                                errorIndex and varBinds[int(errorIndex) - 1][0] or '?'))
            break
        else:
            for varBind in varBinds:
                print(' = '.join([x.prettyPrint() for x in varBind]))

`Download` script.

## Preload PySNMP MIBs

Send a series of SNMP GETNEXT requests using the following options:

- with SNMPv3 with user ‘usr-md5-des’, MD5 auth and DES privacy protocols

- over IPv4/UDP

- to an Agent at demo.snmplabs.com:161

- for all OIDs starting from 1.3.6

- preload all Python MIB modules found in search path

Functionally similar to:

$ snmpwalk -v3 -l authPriv -u usr-md5-des -A authkey1 -X privkey1 -m ALL demo.snmplabs.com:161 1.3.6

    from pysnmp.hlapi import *

    for (errorIndication,
         errorStatus,
         errorIndex,
         varBinds) in nextCmd(SnmpEngine(),
                              UsmUserData('usr-md5-des', 'authkey1', 'privkey1'),
                              UdpTransportTarget(('demo.snmplabs.com', 161)),
                              ContextData(),
                              ObjectType(ObjectIdentity('1.3.6').loadMibs())):

        if errorIndication:
            print(errorIndication)
            break
        elif errorStatus:
            print('%s at %s' % (errorStatus.prettyPrint(),
                                errorIndex and varBinds[int(errorIndex) - 1][0] or '?'))
            break
        else:
            for varBind in varBinds:
                print(' = '.join([x.prettyPrint() for x in varBind]))

`Download` script.

## Custom ASN.1 MIB path

Send SNMP GET request using the following options:

- with SNMPv2c, community ‘public’

- over IPv4/UDP

- to an Agent at demo.snmplabs.com:161

- for IF-MIB::ifInOctets.1 MIB object

- pass non-default ASN.1 MIB source to MIB compiler

Functionally similar to:

$ snmpget -v2c -c public -M /usr/share/snmp demo.snmplabs.com IF-MIB::ifInOctets.1

    from pysnmp.hlapi import *

    errorIndication, errorStatus, errorIndex, varBinds = next(
        getCmd(SnmpEngine(),
               CommunityData('public'),
               UdpTransportTarget(('demo.snmplabs.com', 161)),
               ContextData(),
               ObjectType(ObjectIdentity('IF-MIB', 'ifInOctets', 1).addAsn1MibSource('file:///usr/share/snmp',
                                                                                     'http://mibs.snmplabs.com/asn1/@mib@')))
    )

    if errorIndication:
        print(errorIndication)
    elif errorStatus:
        print('%s at %s' % (errorStatus.prettyPrint(),
                            errorIndex and varBinds[int(errorIndex) - 1][0] or '?'))
    else:
        for varBind in varBinds:
            print(' = '.join([x.prettyPrint() for x in varBind]))

`Download` script.

## Custom PySNMP MIBs location

Send a series of SNMP GETBULK requests using the following options:

- with SNMPv3, user ‘usr-none-none’, no authentication, no privacy

- over IPv4/UDP

- to an Agent at demo.snmplabs.com:161

- for all OIDs within TCP-MIB::tcpConnTable column

- TCP-MIB Python module will be searched by a user-specified filesystem path (/opt/mib/pysnmp) and in Python package (python_packaged_mibs) which should be in sys.path

Functionally similar to:

$ snmpbulkwalk -v3 -lnoAuthNoPriv -u usr-none-none -Cn0 -Cr50 demo.snmplabs.com TCP-MIB::tcpConnTable

    from pysnmp.hlapi import *

    for (errorIndication,
         errorStatus,
         errorIndex,
         varBinds) in bulkCmd(SnmpEngine(),
                              UsmUserData('usr-none-none'),
                              UdpTransportTarget(('demo.snmplabs.com', 161)),
                              ContextData(),
                              0, 50,
                              ObjectType(
                                  ObjectIdentity('TCP-MIB', 'tcpConnTable').addMibSource('/opt/mibs/pysnmp').addMibSource('python_packaged_mibs')
                              ),
                              lexicographicMode=False):

        if errorIndication:
            print(errorIndication)
            break
        elif errorStatus:
            print('%s at %s' % (errorStatus.prettyPrint(),
                                errorIndex and varBinds[int(errorIndex) - 1][0] or '?'))
            break
        else:
            for varBind in varBinds:
                print(' = '.join([x.prettyPrint() for x in varBind]))

`Download` script.

See also: library reference.