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Date: Fri, 18 Mar 2011 11:25:00 -0700
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From: JINMEI Tatuya / =?ISO-2022-JP?B?GyRCP0BMQEMjOkgbKEI=?= <jinmei@isc.org>
To: "Eugene M. Zheganin" <eugene@zhegan.in>
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Cc: freebsd-net@freebsd.org
Subject: Re: ipv6, stateful config and non-default prefixlen
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At Fri, 18 Mar 2011 21:35:16 +0500,
"Eugene M. Zheganin" <eugene@zhegan.in> wrote:

> > You don't say what prefix length rtadvd is sending or that you're seeing
> > in the wireshark log.
> >
> > Do you have prefixlen#120 in your rtadvd.conf?

Whether using /120 is a good idea might have to be debated, but anyway..

> %ps ax | grep dhc
> 25672  ??  Is     0:00,01 /usr/local/sbin/dhclient -6 nfe0

I guess this is ISC DHCP.  It always assumes /64 and (effectively)
installs the given address this way:

# ifconfig nfe0 inet6 fd00::7d2/64 alias

A possible workaround is to rewrite dhclient-script to hardcode
"/120".  Another solution is to use a different DHCPv6 client
implementation.  (Although it's not actively maintained/enhanced
recently) I believe WIDE DHCPv6 should work for your purpose:
http://sourceforge.net/projects/wide-dhcpv6/

---
JINMEI, Tatuya
Internet Systems Consortium, Inc.