This is required for Linux to accept the RIO
with this patch:
2001:db8:8000::/33 via fe80::d0e7:ffff:fe46:6b52 dev tap0 proto ra metric 1024 expires 86338sec pref medium
2001:db8::/32 dev tap0 proto kernel metric 256 pref medium
before:
2001:db8::/32 dev tap0 proto kernel metric 256 pref medium
If we get a large (e.g. /62) prefix from e.g. DHCPv6, we can split it
into subnets automatically to configure downstream interfaces.
This allows for automatic configuration of daisy-chained nodes or
nodes connected in a tree topology.
To enable the feature, a new pseudo-module `gnrc_ipv6_auto_subnets` is
provided.
