why would the sample settings recommend setting:
ip route add ::/0 dev he-ipv6
instead of
ip route add 2000::/3 dev he-ipv6
?
what's the up side (or downside) ?
Thanks
Because the first example you listed covers everything (once they assign something other than 2000::/3)
The 2000::/3 is only used on some linux kernels
that's what I don't understand... RFC4291 says Global ones are only 2000::/3, so what would I be missing?
you mean for when/if IANA decides that A000::/3 is also part of the Global pool?
Quote
you mean for when/if IANA decides that A000::/3 is also part of the Global pool?
Exactly. It's only a matter of time till they do that, and unless you change your default route, you won't be able to access places that use any range other than 2000::/3
BTW, did that RFC mention a reason they picked 2000::/3 instead of starting at the beginning? Say 0001::/3?
they did not ...
here's more info from
http://www.iana.org/assignments/ipv6-address-space/ipv6-address-space.txt (http://www.iana.org/assignments/ipv6-address-space/ipv6-address-space.txt)
Quote
The IPv6 Unicast space encompasses the entire IPv6 address range with the exception of FF00::/8. [RFC4291] IANA unicast address assignments are currently limited to the IPv6 unicast address range of 2000::/3.
So you're right, at some point they may start assigning more blocks.
For convenience, here's the current status (as of 2010-10-29):
IPv6 Prefix Allocation Reference
0000::/8 Reserved by IETF [RFC4291]
0100::/8 Reserved by IETF [RFC4291]
0200::/7 Reserved by IETF [RFC4048]
0400::/6 Reserved by IETF [RFC4291]
0800::/5 Reserved by IETF [RFC4291]
1000::/4 Reserved by IETF [RFC4291]
2000::/3 Global Unicast [RFC4291]
4000::/3 Reserved by IETF [RFC4291]
6000::/3 Reserved by IETF [RFC4291]
8000::/3 Reserved by IETF [RFC4291]
A000::/3 Reserved by IETF [RFC4291]
C000::/3 Reserved by IETF [RFC4291]
E000::/4 Reserved by IETF [RFC4291]
F000::/5 Reserved by IETF [RFC4291]
F800::/6 Reserved by IETF [RFC4291]
FC00::/7 Unique Local Unicast [RFC4193]
FE00::/9 Reserved by IETF [RFC4291]
FE80::/10 Link Local Unicast [RFC4291]
FEC0::/10 Reserved by IETF [RFC3879]
FF00::/8 Multicast [RFC4291]
Thanks for the input, I guess for the time being I'll stick with routing only 2000::/3