Microsoft Windows XP [Version 5.1.2600] (C) Copyright 1986-2001 Microsoft Corp. C:\WINDOWS>netsh interface ipv6 add dns ?
Usage: add dns [interface=][address=][[index=]]
interface - The name of the interface where DNS servers are added.
address - The IPv6 address for the DNS server you are adding.
index - Specifies the index (preference) for the specified
DNS server address.
Remarks: Adds a new DNS server IPv6 address to the statically-configured list.
By default, the DNS server is added to the end of the list. If an
index is specified, the DNS server will be placed in that position
in the list, with other servers being moved down to make room.
add dns "Local Area Connection" fec0:0:0:ffff::1
add dns "Local Area Connection" fec0:0:0:ffff::2 index=2