IPv6 with dnsmasq

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I have an IPv6 tunnel to Hurricane Electric which works fine, as long
as I statically allocate IPv6 addresses on my machines.
I use dnsmasq to allocate IPv4 addresses on my network and I'd like to
use it for IPv6 allocation as well.
The dhcp client always sends a different duid, reading the
documentation I put the following in my /etc/network/interfaces

auto eth0
iface eth0 inet dhcp
iface eth0 inet6 dhcp
	autoconf 0

The duid passed to dnsmasq changes each time I restart the interface.
I have IPv6 connectivity on the client as it gets an address, just not
the address I want.

Do I need a different dhcp client, or have I just missed a
configuration step somewhere?
Googling hasn't turned up anything - lots of pointers to radvd & so on.

- -- 
Andy Ruddock
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[email protected] (OpenPGP Key ID 0xB0324245)
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