net.inet6.ip6.rthdr0_allowed is not working

[Arul Murugan]

Hello,
I am using FreeBSD 7 for IPv6 Logo testing, where in i need to
enable Router header processing, i tried with
"net.inet6.ip6.rthdr0_allowed=1", but it is not working.

Operatting system Version:
--------------------------------
tar2# uname -a
FreeBSD tar2.ipv6logo.hp.com 7.0-RELEASE FreeBSD 7.0-RELEASE #0: Sun Feb 24
19:59:52 UTC 2008 root at logan.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC
i386

Failure in sysctl:
--------------------

tar2# sysctl -w net.inet6.ip6.rthdr0_allowed=1
sysctl: unknown oid 'net.inet6.ip6.rthdr0_allowed'

I've seen 'net.inet6.ip6.rthdr0_allowed' in Free BSD 7 Release notes.
and it is not working. Could any one please help
me to enable Routing Header.

Thanks in Advance.

Regards,
Arul