Precedence Label Prefix
------------- ------ --------------------------------
50 0 ::1/128 = localhost
40 1 ::/0 = default (IPv6 native)
30 2 2002::/16 = 6to4 (IPv6)
20 3 ::/96 = IPv4 compatibility
10 4 ::ffff:0:0/96 = IPv4 compatibility
5 5 2001::/32 = Teredo (IPv6)
http://www.dd-wrt.com/wiki/index.php/IPv6_%28tutorial%29#6to4_IPv6_as_default_protocol
Quote:
6to4 IPv6 as default protocol
As per RFC3484 §2.1 default policy table, having a 6to4 enabled LAN will mean that 6to4 IPv6 will only be used to communicate to a server if the server is having a 6to4 adress too (ie: 2002: prefix on its address) or if there is no IPv4 address assigned to the server name (ie: no A but an AAAA).
In short the following makes IPv6 (6to4) default on IPv6 enabled Windows boxes:
1. Start -> Run -> "cmd" -> "netsh" -> "interface" -> "ipv6"
2. To set IPv6 (6to4) as the default protocol on Microsoft Windows...
set prefix ::1/128 50 0
set prefix ::/0 40 1
set prefix 2002::/16 30 1
set prefix ::/96 20 3
set prefix ::ffff:0/96 10 4
set prefix 2001::/32 5 5
Only the 2002::/16 line (6to4 prefix policy) is changed.
3. To make things goes back to original mode (IPv4 preference)...
set prefix ::1/128 50 0
set prefix ::/0 40 1
set prefix 2002::/16 30 2
set prefix ::/96 20 3
set prefix ::ffff:0/96 10 4
set prefix 2001::/32 5 5
And Voilà ;-)
Shorter method also available here:
