IPV6_SUBTREES in kernel

[danielschonfeld]

Is it possible to turn that feature on in the kernel?

some IPv6 implementations of some ISPs hand out an address that isn't routable and when used by default causes ipv6 traffic originating from the router itself to go into a blackhole. This option allows setting the 'from' portion on the default gateway or really on any IPv6 static route.

example:

 ip -6 route add default via fe80::1 from 2100::1 dev eth0

Thanks!