My RT-AC66U is running Merlin version 380.64.
From this post http://www.snbforums.com/threads/snmp-monitoring.23121/
I understand generic Linux SNMP is enabled.
From the OID's listed here https://www.dd-wrt.com/wiki/index.php/SNMP#Known_OID.C2.B4s_via_SNMP
there's one command that should...