I see the following message showing repeatedly in the /var/log/daemon.log of My Book Live (which seems to be working fine).
$ tail /var/log/daemon.log
Aug 8 21:32:48 [hostname] mDNSResponder: ERROR: getOptRdata - unknown opt 4
Aug 8 21:32:52 [hostname] mDNSResponder: ERROR: getOptRdata - unknown opt 4
Aug 8 21:33:38 [hostname] mDNSResponder: ERROR: getOptRdata - unknown opt 4
Aug 8 21:40:39 [hostname] mDNSResponder: ERROR: getOptRdata - unknown opt 4
Aug 8 21:40:40 [hostname] mDNSResponder: ERROR: getOptRdata - unknown opt 4
Aug 8 21:40:40 [hostname] mDNSResponder: ERROR: getOptRdata - unknown opt 4
Aug 8 21:40:40 [hostname] mDNSResponder: ERROR: getOptRdata - unknown opt 4
Aug 8 21:40:41 [hostname] mDNSResponder: ERROR: getOptRdata - unknown opt 4
Aug 8 21:40:45 [hostname] mDNSResponder: ERROR: getOptRdata - unknown opt 4
Aug 8 21:41:12 [hostname] mDNSResponder: ERROR: getOptRdata - unknown opt 4
Any clue what is causing it? Do you have any suggestion to stop it? Thanks!