This is what I have done on sim box, hope it helps. (8.2.1 7m)
ontap3> rdfile /etc/resolv.conf
#Auto-generated by setup Thu Jun 19 12:30:43 GMT 2014
nameserver 192.168.81.131
nameserver 192.168.81.132
ontap3> wrfile /etc/resolv.conf
#Auto-generated by setup Thu Jun 19 12:30:43 GMT 2014
nameserver 192.168.81.133
read: error reading standard input: Interrupted system call
ontap3> dns info
DNS is enabled
DNS caching is enabled
2 cache hits
3 cache misses
0 cache entries
1 expired entry
1 cache replacement
IP Address State Last Polled Avg RTT Calls Errs
-------------------------------------------------------------------------------------------------------------
192.168.81.133 NO INFO 0 0 0
Default domain: san.intra
Search domains: san.intra
Message was edited by: Erkan Aksoy