There are only 2 fan settings that can be controlled. FANA and all the other fans. FAN1234 is just what I chose to call it since most the boards had only 4 fans plus FANA.
You're gonna need a monitor or configure your router to use the new mac address of the server and old ip address. Could try IPMI console too by connecting to the ip address of the bmc.
The workaround will not work with 6.6.7. The plugin should still work on 6.6. net-snmp 5.8 is only for 6.7.rc. For 6.7 you have to modify the plg file as@SimonF did above.
That is the ip for the nut service. And if you have nut master server on a different computer, then that's the ip for the master server. I don't have any experience with setting up nut to use snmp. But everything is there for it.