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RE: [v6ops] Combining IPv6 ND and DHCPv6 into a single, unified function

"STARK, BARBARA H" <bs7652@att.com> Mon, 27 November 2017 13:20 UTC

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From: "STARK, BARBARA H" <bs7652@att.com>
To: Fred Baker <fredbaker.ietf@gmail.com>, Michael Richardson <mcr+ietf@sandelman.ca>
CC: "dhcwg@ietf.org" <dhcwg@ietf.org>, "v6ops@ietf.org" <v6ops@ietf.org>, "6man@ietf.org" <6man@ietf.org>
Subject: RE: [v6ops] Combining IPv6 ND and DHCPv6 into a single, unified function
Thread-Topic: [v6ops] Combining IPv6 ND and DHCPv6 into a single, unified function
Thread-Index: AdNiReoj4OrwrQYST+iGtIF1uM57NgAkcdkAADO+44AADW0NAAAPizUAANmFatA=
Date: Mon, 27 Nov 2017 13:19:54 +0000
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> > My understanding is that Fred Templin essentially wants to carry DHCP
> > (configuration) options in ND/RA.
> 
> On thing that I have never understood is the lack of an RA option that carries
> any DHCPv6 option. This entire silly debate would end if RAs encompassed
> DHCP options.

Thus forcing either routers or hosts (or both) to support two distinct mechanisms to do the same thing if there is to be any hope of interoperability. And if the host supports both, then it also needs to implement code for which wins when both are present and the options provided have conflicting info.
If you really want DHCPv6 options in RAs for closed ecosystem use cases, include a huge caveat that routers are not required to support both mechanisms -- routers are only required to do DHCPv6. Any host that only implements receipt of DHCPv6 options via RA must not expect to operate in an open ecosystem. Put the burden on the hosts. 
Barbara

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