Today, I learned that FreeNAS 8.0’s SNMP isn’t quite all one could hope for. The good news is, the bugs will be fixed in 8.0.1. I’m posting this in the hope of saving others the annoyances I had.
To SNMP query a FreeNAS 8.0 host, you must force the client to use SNMPv2.
# snmpwalk -c public -v 2c freenashost
Additionally, you can’t change the community name (at least on the amd64 version). You must use public.