'dig +nsid' requests NSID from server.
'request-nsid yes;' causes recursive server to send
NSID requests to upstream servers. Server responds
to NSID requests with the string configured by
'server-id' option. [RT #17091]
--with-irs-gr=yes #define WANT_IRS_GR --with-irs-nis=yes #define WANT_IRS_NIS --with-irs-pw=yes #define WANT_IRS_PW