Installed Net-SNMP from OpenBSD binary repository on my virtual server (VMware) with no problem , I run with SNMP version 1 , test it with snmptrap with no problem , everything is okay.
I did setup device on cacti, the snmp data query well. Bad think happen few minute latter , net-snmp always crash after some periodic time ( trapped by cacti cron ). I did compile from ports with no succcess, the error messege generated from ports is too painfull to debug :/
Recently I try use snmpd came with OpenBSD 5.7 , did a little configuration , just one line for version 1 on /etc/snmpd.conf
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Start the snmpd with rc.d script , test it using cacti and run very stable , no more crash 🙂