Difference between 005 and 006 Scope Options 005 Name Servers 006 DNS Servers With Option 5, you can set the IEN-116 name servers. That's a predecessor to the DNS system and dates back to stone-age. Your chances to find a server that understands this protocol are rather slim. IEN 116, J. Postel; ISI; August 1979: INTERNET NAME SERVER http://www.networksorcery.com/enp/ien/ien116.txt Request for Comments: 1034;P . Mockapetris; ISI; November 1987: DOMAIN NAMES - CONCEPTS AND FACILITIES http://www.apps.ietf.org/rfc/rfc1034.html Basic options (RFC 1497) http://www.microsoft.com/windows2000/en/server/help/default.asp?url=/windows2000/en/server/help/sag_DHCP_add_OptionsBasic.htm