Re: [dhcwg] MTU option for DHCPv6?

"Templin, Fred L" <Fred.L.Templin@boeing.com> Thu, 28 July 2016 15:35 UTC

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From: "Templin, Fred L" <Fred.L.Templin@boeing.com>
To: Lorenzo Colitti <lorenzo@google.com>
Thread-Topic: [dhcwg] MTU option for DHCPv6?
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Date: Thu, 28 Jul 2016 15:35:29 +0000
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Cc: "<dhcwg@ietf.org>" <dhcwg@ietf.org>, "Bernie Volz \(volz\)" <volz@cisco.com>
Subject: Re: [dhcwg] MTU option for DHCPv6?
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Hi Lorenzo,

The link is NBMA – and there could be a quite large number of nodes on the link.

Thanks - Fred

From: Lorenzo Colitti [mailto:lorenzo@google.com]
Sent: Thursday, July 28, 2016 8:30 AM
To: Templin, Fred L <Fred.L.Templin@boeing.com>
Cc: Bernie Volz (volz) <volz@cisco.com>om>; otroan@employees.org; Ian Farrer <ianfarrer@gmx.com>om>; <dhcwg@ietf.org> <dhcwg@ietf.org>
Subject: Re: [dhcwg] MTU option for DHCPv6?

On Fri, Jul 29, 2016 at 12:10 AM, Templin, Fred L <Fred.L.Templin@boeing.com<mailto:Fred.L.Templin@boeing.com>> wrote:

RA doesn’t provide nearly the same configuration flexibility as DHCPv6. RA also

doesn’t have Rebind/Renew/Release messags that can be used to manage

mobiole devices. And, RA also does not have DHCPv6 Security.

What does this link look like? Is it a point-to-point link? If so, then RAs are equivalent to DHCPv6 because they are effectively unicasted to a single client. As for security, basic DHCPv6 doesn't usually provide security either. And if the link is wireless, I would hope it does encryption already?


Finally, RA does not have the back-end database management capabilities that are built into common public domain DHCPv6 implementations.
It's perfectly possible to do this with RAs. The Framed-IPv6-prefix option was defined in 2001. When I looked at it as far back as 2010, common implementations (e.g., Juniper) were perfectly capable of create dynamic VLANs and configure RA parameters based on radius attributes.