Microsoft Windows [Version 6.0.6001] (C) Copyright 2006 Microsoft Corp. c:\windows>netsh interface ipv6 delete dnsserver ?
Usage: delete dnsserver [name=][[address=]|all]
Parameters:
Tag Value
name - The name of the interface where DNS servers are deleted.
address - One of the following values:: A specific IPv6 address of a DNS server
you are deleting.
all: Deletes all configured IPv6 addresses for DNS
servers.
Remarks: Deletes statically configured DNS server IPv6 addresses for a
specific interface.
Examples:
delete dnsserver "Local Area Connection" fec0:0:0:ffff::1
delete dnsserver "Local Area Connection" all