Disable sending ICMPV6 redirects on IPV6

Hello,
I try to find out how to disable a Linux machine (acting as a router)
from sending ICMPV6 redirects ;

There is : /proc/sys/net/ipv6/conf/all/accept_redirects
but I cannot find /proc/sys/net/ipv6/conf/all/send_redirects

(In IPV4 there is both /proc/sys/net/ipv4/conf/all/send_redirects and
/proc/sys/net/ipv4/conf/all/accept_redirects)

Maybe it is impossible to disable a Linux machine from sending
ICMPV6 redirects?
Any ideas?

Regards,
Ian


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