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Date: Mon, 10 Dec 2012 03:45:22 -0500
From: Phil Pennock <phil.pennock@spodhuis.org>
To: Michael Richardson <mcr@sandelman.ca>
Message-ID: <20121210084522.GA93640@redoubt.spodhuis.org>
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Cc: cerowrt-users <cerowrt-users@lists.bufferbloat.net>
Subject: Re: [Cerowrt-users] 6in4 links
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On 2012-12-09 at 21:04 -0500, Michael Richardson wrote:
> The problem is that the interface that is created is a /128, and it's
> the ::2, but since it is a /128, the ::1 isn't "On-network", so the
> static route fails.

Er, a /128 means there can be no route associated with it, this is used
typically for things like additional aliases on an interface.  To use
this for sending traffic, you'd need a concept of "pump to far side"
which exists for things like a tunnel, but not for stf0, which is able
to talk to arbitrary end-points.

For stf0, perhaps you want a /16 ?

You might want a /127 per RFC 6164 (and RFC 6547 explicitly
recategorised the /127s-harmful RFC as historic).  Note that a ::1 and a
::2 would still be on different networks for a /127.  You perhaps want
::2 and ::3 (or a /126 but then consider the ping-pong issues).

-Phil