Troubleshooting SNMPv3
This article will outline the major steps required to check and troubleshoot some simple defects in SNMPv3. The reason why I am specifically focusing on SNMPv3 is the fact that since its version 3, SNMP has introduced authentication and encryption, often referred to "Auth" and "Ident". Bear in mind that this article does not contain step-by-step full procedure to configure SNMP, only outlines some basic errors and ways how to diagnose them. To start with, one needs to create a user. Before that we will stop the snmpd service and only create the user after the service has been stopped. This is shown in the Figure above. Note that the user requires both password for authentication ("authPassword1") , hashing algorithm for password ("SHA"), encryption pre-shared key ("encryptPassword1") and symmetric encryption algorithm ("AES"). The next step is checking if the restarted SNMP service is listening on its default (161) UDP