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Re: [v6ops] Secdir telechat review of draft-ietf-v6ops-transition-ipv4aas-12

Christian Huitema <huitema@huitema.net> Wed, 09 January 2019 06:13 UTC

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To: JORDI PALET MARTINEZ <jordi.palet@consulintel.es>, "STARK, BARBARA H" <bs7652@att.com>
Cc: "v6ops@ietf.org" <v6ops@ietf.org>, "ietf@ietf.org" <ietf@ietf.org>, "secdir@ietf.org" <secdir@ietf.org>
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From: Christian Huitema <huitema@huitema.net>
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Date: Tue, 08 Jan 2019 22:13:02 -0800
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Subject: Re: [v6ops] Secdir telechat review of draft-ietf-v6ops-transition-ipv4aas-12
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On 1/8/2019 10:38 AM, JORDI PALET MARTINEZ wrote:
> The security concerns raised *initially* by Christian were related to the use of DHCP for configuring the WAN. At least that was what I understood. Then we continued discussing about the LAN, which I agree with you, is not a requirement on this document.

I may be very confused, because the way I read your draft I assumed that
the DHCPv6 S46 option was meant to inform the LAN-side devices of the
available and preferred transition services. From what you are telling
me, the S46 option is actually provided by the WAN side DHCPv6 server,
of which the CPE is a client. That would be the preferred way for an ISP
to configure the customer premise device.

If the DHCPv6 option is only used on the WAN side, then I agree with
Barbara and you that solutions like DHCP Guard or 802.1x are not
relevant. There is no need for the proposed paragraph starting with
"considering that" and ending with "scope of this document".

On the other hand, if I was that much confused, others will be too. I
might be useful to drop a line in section 3.2 explain in layman terms
how the S46 option is used.

-- Christian Huitema

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