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Linux: SNMPv3 with Python

Works out of the box.

  • if you’re fine with AES128-Encryption.

AES256 might not be a requirement in all cases, but having the opportunity to choose seems to be not absolutely absurd in 2017… Good news: The NetSNMP-AES192/256-patch is on the way.

EasySNMP installation and usage
I’d like to refer to Linux: SNMP with Python for the basics.

IOS-Config: VIEW/GROUP/USER
Take the opportunity and leverage SMP-Views to limit access to several SNMP-OIDs.

snmp-server view SV_EASYSNMP interfaces included
snmp-server view SV_EASYSNMP ciscoCdpMIB included
snmp-server view SV_EASYSNMP ciscoCBQosMIB included

ip access-list standard ACL_SNMP
 permit 192.168.2.89

snmp-server group SG_EASYSNMP v3 auth read SV_EASYSNMP access ACL_SNMP

snmp-server user EASYSNMP SG_EASYSNMP v3 auth sha AUTHPASS priv aes 128 PRIVPASS

EasySNMP: „Session“-Object with SNMPv3-Credentials
Find the official docs here: EasySNMP Session-API

Security level could be:

  • no_auth_or_privacy
    • If you want to use the user-based authentication without need for security
  • auth_without_privacy
    • Authentication only might be „good enough“ when traffic is fully kept within a management network
  • auth_with_privacy

Authentication-Procol:

  • MD5
  • SHA

Privacy-Protocol:

  • AES
    • AES128
  • DES, 3DES
    • For very outdated devices

Create the Session-Object

>>> session3 = Session(hostname='192.168.2.72', version=3,
security_level="auth_with_privacy", security_username="EASYSNMP",
auth_protocol="SHA", auth_password="AUTHPASS",
privacy_protocol="AES", privacy_password="PRIVPASS")

Use this „session“ as before.

>>> session3.walk("1.3.6.1.4.1.9.9.166.1.15.1.1.2")
[<SNMPVariable value='9' (oid='enterprises.9.9.166.1.15.1.1.2.18.65536', oid_index='',
snmp_type='COUNTER')>, <SNMPVariable value='0' (oid='enterprises.9.9.166.1.15.1.1.2.18.131072', oid_index='',
snmp_type='COUNTER')>, <SNMPVariable value='6039' (oid='enterprises.9.9.166.1.15.1.1.2.18.196608', oid_index='', snmp_type='COUNTER')>, <SNMPVariable value='0' (oid='enterprises.9.9.166.1.15.1.1.2.34.65536', oid_index='',
snmp_type='COUNTER')>, <SNMPVariable value='0' (oid='enterprises.9.9.166.1.15.1.1.2.34.131072', oid_index='',
snmp_type='COUNTER')>, <SNMPVariable value='0' (oid='enterprises.9.9.166.1.15.1.1.2.34.196608', oid_index='',
snmp_type='COUNTER')>]

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