Re: [dhcwg] light review of draft-ietf-dhc-sedhcpv6 and helpful suggestion

Lishan Li <> Thu, 20 April 2017 14:22 UTC

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From: Lishan Li <>
Date: Thu, 20 Apr 2017 22:22:18 +0800
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To: Kathleen Moriarty <>
Cc: "<>" <>, Michael Richardson <>, Paul Wouters <>
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Subject: Re: [dhcwg] light review of draft-ietf-dhc-sedhcpv6 and helpful suggestion
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Hi, Kathleen,

Thanks a lot for your valuable comments on the draft. Please see inline.

Best Regards,

2017-04-18 4:43 GMT+08:00 Kathleen Moriarty <kathleen.moriarty.ietf@gmail.

> Dear authors,
> I just skimmed the draft  triggered by another review and noticed the
> deployment concerns in the WGLC summary sent to the list.  think I can
> help here with the remaining issues on making it easier to deploy.
> First, I'm really glad to see this work.  Thanks for all of your
> efforts on it!  Second, I know this is late in the process, but I
> think more text on opportunistic security for IPsec is worth
> documenting to overcome implementation hurdles and address the coffee
> shop use cases.  I didn't see a reference to:
> and am thinking the authors/WG might not be aware of this work.
> Additionally, it should be noted that there are several Linux
> implementations for IPsec with NULL authentication (OS).  Paul
> Woulters is a author on the mentioned RFC and did implement this with
> IPsec for RedHat.
[LS]: In the before, we are just aware of the work of RFC7435 and not aware
of RFC7619. For the reference of RFC7619, I have one question and want to
get your guidance.
RFC7619 proposes the NULL authentication method for IPsec. If we add the
reference of RFC7619 for coffee shop scenario, then IPsec is used to
the security of DHCPv6? Right?

However, our document defines the secure DHCPv6 mechanism, not using
the IPsec mechanism. If the IPsec mechanism is used, then the client and
Relay and Relay, Relay and server need to establish the IPsec communication.
And for our document, we just want to protect the information between the
and server, so secure DHCPv6 is suited.

As opportunistic security for IPsec, our document proposes opportunistic
for DHCPv6. For the coffee shop, then the client and server can start the
authentication mode, which is easy to deployed.

Could you please help check whether my understanding correct? Looking
forward to
your further comments.

> Michael Richardson is an author on the draft:
> documenting the OS IPsec implementation for the Linux FreeS/WAN project.
> I think it would be beneficial to see text that has OS as mandatory to
> implement (MTI) and upgradeable to authenticated IPsec when practical.
> Ideally, they would both be MTI, not mandatory to use (MTU) at least
> for the authenticated since that is too hard.  But MTI on
> opportunistic would be a great next step that could be deployed.  If
> we were able to get DCHPv6 supporting this option in code with OS,
> then people could turn it on.  As you point out in the draft,
> enterprise and other managed scenarios could use an option with
> authentication if implemented.  I think the MTI versus MTU could have
> been more clear in this draft and the relay one that just went through
> the IESG review.
> The current OS text leaves me, the reader, thinking it won't be
> implemented as it's not pointing to a practical implementable RFC.  I
> am copying Michael and Paul (mentioned above) as one of them might be
> willing to help with text.  I think this will greatly assist with the
> deployability of session encryption.

[LS]: So, in our document, we need to states that: Opportunistic security
is mandatory to implement, not just say that opportunistic security can be
used for secure DHCPv6 deployment. Could you please help check whether
my understanding correct?

Thanks again,