ipv6 route problems

[debian-v6@21st-century-networks.com]

debian-ipv6ers,

I'm trying to set up an IPv6 default route without using stateless
address autoconfiguration.  In the example below, I want to set up a
default route through a router interface at IPv6 address
fd35:5ab8:3be8:eeee::1, which is on interface eth1:

sudo /sbin/ip -6 route add ::/0 via fd35:5ab8:3be8:eeee::1 dev eth1
RTNETLINK answers: Invalid argument

Setting a route to a specific block also fails:

/sbin/ip -6 route add fd35:5ab8:3be8:1::/64 via fd35:5ab8:3be8:eeee::1
dev eth1
RTNETLINK answers: Invalid argument

I can't tell what is wrong; this appears to be correct syntax.  Is there
in fact a syntax error or is something else misconfigured?  I am using
the default 2.6.22-3-686 debian kernel.

Thanks,

Bill Cerveny