From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Wed,  4 Oct 2006 16:22:25 -0700
From: Lyndon Nerenberg <lyndon@orthanc.ca>
To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Message-ID: <20061004161805.B72134@orthanc.ca>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
Subject: [9fans] configuring ipv6
Topicbox-Message-UUID: c506c404-ead1-11e9-9d60-3106f5b1d025

I tried the obvious

   ip/ipconfig ether /net/ether0 2002:ccf4:e05d:1::42 ffff:ffff:ffff:ffff::

which provokes the response

   ipconfig: write(add 2002:ccf4:e05d:1::42 ffff:ffff:ffff:ffff::):
 		interface does not support multicast

If I execute that ipconfig a second time the machine locks up solid 
(pccpuf kernel).  The interface is already running ipv4, FWIW.

What's the magic dance to make ipv6 go?