Howto set an IPv6 route?

[Roger Schreiter]

Hello,

I tried:

route add -inet6 2a00:1ff8:101::/48 2a00:1ff8:102:ac01::1

and got:

route: 2a00:1ff8:101::/48: bad value

I do not understand, what is wrong with that net?
Can anyone give me a hint?

Roger.