> However, we might be able to make the suggested restrictions a bit
less
> burdensome, provided that we can satisfy the never-route-private-addrs
> zealots that the revised scheme can still be effective in limiting
> unintended propagation of non-globally-routable prefixes. See below
for
> specifics.  I'll welcome further comments from any source.

The goal of the recommendation is both to provide some degree of
isolation, and also to ensure that the local addresses are not abused in
the future. One way to achieve that is to ensure that routers
systematically junk any packet sent to FC00::/8 or FD00::/8, unless a
more specific route has been installed. This will not require Dan to
update his internal routers, since there will indeed be a more specific
route for his own internal site. Backdoor connections between links will
also work, if a /48 route is announced for the backdoor.

-- Christian Huitema


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