Simon Arlott wrote:
> You're making the assumption that IPv4 assigns one IP per network, which we
> know isn't true...
> when 2000::/3 runs out there's 4000::/3 and more - it's 1/7th of the
> available space.
>
The way I understand it the others are used for local/multicast/etc. and
2000::/3 is it, and always will be. You don't use 0::/0 because then
link local and site addresses could leak out, which you don't want.
You could try to change it but it'd break loads of stuff.. it's
hardcoded into cisco IOS for example (I didn't set the routing below,
IOS did):
>sh ipv6 route
IPv6 Routing Table - 4 entries
Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP
U - Per-user Static route, M - MIPv6
I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary
O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
D - EIGRP, EX - EIGRP external
S 2000::/3 [1/0]
via ::, Dialer0
C 2001:8B0:178:1::/64 [0/0]
via ::, Vlan1
L 2001:8B0:178:1::2/128 [0/0]
via ::, Vlan1
L FF00::/8 [0/0]
via ::, Null0
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