Even tough you have very good arguments, my suggestion would be to have a
class A network (I got that right, right?) for all the users and only having
6rd as service on that network.
ARIN and IETF cooperated last year to allocate 100.64.0.0/10 for CGN
use. See RFC 6598. This makes it possible to implement a CGN while
conflicting with neither the user's RFC1918 activity nor the general
Internet's use of assigned addresses. Hijacking a /8 somewhere instead
is probably not a great move.
Ok.
If I have calculated the netmasks right that would mean to set aside:
2001:0DB8:6440::/42
for the use of 6rd service:
2001:0DB8:6440:0000::/64 = 100.64.0.0
....
2001:0DB8:647F:FFFF::/64 = 100.127.255.255
--
//fredan
http://tlmc.fredan.se
