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Re: New Version Notification for draft-troan-6man-universal-ra-option-03.txt

Lorenzo Colitti <lorenzo@google.com> Wed, 07 October 2020 13:43 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Wed, 07 Oct 2020 22:43:43 +0900
Message-ID: <CAKD1Yr0YYswgJ8kCdx_USUezf8g=qxkqungWT=oja2DanNoS7A@mail.gmail.com>
Subject: Re: New Version Notification for draft-troan-6man-universal-ra-option-03.txt
To: Ole Troan <otroan@employees.org>
Cc: Philip Homburg <pch-ipv6-ietf-6@u-1.phicoh.com>, 6man WG <ipv6@ietf.org>
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On Wed, Oct 7, 2020 at 10:32 PM <otroan@employees.org> wrote:

> The architectural change that this brings, is that no longer is changes to
> router operating systems or the host stack kernel required.
>

I don't see how this is an advantage of this particular proposal. Changing
RA options is possible today; there is nothing stopping an implementation
such as radvd from allowing the user to configure arbitrary options. For
hosts, Linux already has the ability to pass arbitrary RA options to
userspace via the RTM_NEWNDUSEROPT netlink message which contains the
option. And of course, it's possible to get the raw RA in userspace via a
packet socket. Other OSes almost certainly provide the latter.

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