OpenBSD IPv6 problem

[Antonio Querubin]

On Tue, 6 Mar 2001, Feico Dillema wrote:

> >         inet6 3ffe:80b0:1001:ff::3 -> 3ffe:80b0:1001:ff::2 prefixlen 127
>                                                              ^^^^^^^^^^^^^
> I believe the only prefixlengths Kame accepts for a gif tunnel are 64
> and 128.

Anyone know what's the rationale for allowing only those 2 values?  I can
understand allowing the 64 but disallowing 127 while allowing 128 seems
overly restrictive.  You do need to know there's at least 1 other on-link
device on the same interface to setup BGP peering.  Otherwise it seems
that in the case of a 128 prefixlength, one would need to do ebgp multihop
as well as add a static route to the remote peer address, or in the 64
prefixlength case, waste a SLA for the link?