SNMP traps, what we know so far, SNMPv3

• for SNMPv3 trapping it's required to create on the user per one device, engineID works like a white flag. Gathering all engineIDs per device is a mandatory thing
• To capture EngineID, it's not required to know any username and password. Just capture traffic using tcpdump and browse it via Wireshark:
  
• To create a user and configure everything:
  http://net-snmp.sourceforge.net/wiki/index.php/TUT:Configuring_snmptrapd_to_receive_SNMPv3_notifications
• in /etc/snmp/snmptrapd.conf the EngineID must start with '0x'