IETF RFC 2181 covers the operation of secondary domain name servers. Full text of RFC 2181 (http://www.ietf.org/rfc/rfc2181.txt) Clarifications to the DNS Specification. Robert Elz[?], Randy Bush[?]. July 1997. (Format: TXT=36989 bytes) (Updates RFC 1034[?], RFC 1035[?], RFC 1123) (Updated by RFC 2535) (Status: PROPOSED STANDARD)