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Re: [v6ops] DHCPv6/SLAAC Make Hosts Confusing-//RE: new draft: draft-liu-bonica-v6ops-dhcpv6-slaac-problem

Tore Anderson <tore@fud.no> Thu, 24 October 2013 09:02 UTC

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Date: Thu, 24 Oct 2013 11:02:17 +0200
From: Tore Anderson <tore@fud.no>
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To: Mikael Abrahamsson <swmike@swm.pp.se>, 神明達哉 <jinmei@wide.ad.jp>
References: <201310211245.r9LCj0B29668@ftpeng-update.cisco.com> <alpine.DEB.2.02.1310211454090.26825@uplift.swm.pp.se> <8AE0F17B87264D4CAC7DE0AA6C406F453D7CC14B@nkgeml506-mbx.china.huawei.com> <alpine.DEB.2.02.1310221511520.8663@uplift.swm.pp.se> <1382469405.56346.YahooMailNeo@web142504.mail.bf1.yahoo.com> <alpine.DEB.2.02.1310230533340.1838@uplift.swm.pp.se> <1382519509.39565.YahooMailNeo@web142502.mail.bf1.yahoo.com> <55F2A998-0417-4C19-B248-AA2A80EBF29C@cisco.com> <CAJE_bqcAKBy62tzXP1aHhoYK_p49Hdv434-6uR-gC6rczyr=JA@mail.gmail.com> <alpine.DEB.2.02.1310232049130.1838@uplift.swm.pp.se>
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Cc: "v6ops@ietf.org" <v6ops@ietf.org>, "draft-liu-bonica-v6ops-dhcpv6-slaac-problem@tools.ietf.org" <draft-liu-bonica-v6ops-dhcpv6-slaac-problem@tools.ietf.org>
Subject: Re: [v6ops] DHCPv6/SLAAC Make Hosts Confusing-//RE: new draft: draft-liu-bonica-v6ops-dhcpv6-slaac-problem
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* Mikael Abrahamsson

> On Wed, 23 Oct 2013, 神明達哉 wrote:
> 
>> implementation dependent, and IIRC the ISC DHCPv6 client
>> unconditionally uses a /64 prefix when it configures a host's
>> interface with the address assigned via DHCPv6.
> 
> Are you sure? I don't know what Ubuntu uses, but I have successfully
> gotten it to just get a single IA_NA + default gw, no /64 on the interface.

I added a workaround for the ISC bug in GNOME NetworkManager one and
ahalf year ago, basically we ignore whatever the DHCPv6 client tells us
and go with a prefix length of 128 always:

http://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=eb460b70dad82d366d35fa5703c0e79a1389e4d1

I reported the bug to ISC too, but I have heard exactly nothing back
from them.

Tore

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