sysctl permission denied on mc_forwarding keys

On Debian testing, Linux 3.0.0-1-686-pae, the kernel config file
in /boot/config-3.0.0-1-686-pae has

CONFIG_IP_MROUTE=y
CONFIG_IP_MROUTE_MULTIPLE_TABLES=y
CONFIG_IPV6_MROUTE=y
CONFIG_IPV6_MROUTE_MULTIPLE_TABLES=y


Please would somebody explain why this happens?

# sysctl net.ipv4.conf.default.mc_forwarding=1

error: permission denied on key 'net.ipv4.conf.default.mc_forwarding'

and similiarty for .all., .eth0., .gre1. etc.

Why is it not possible to turn on multicast forwarding on any interface?

Thanks for your help.
.

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