Re: [v6ops] new draft: draft-yc-v6ops-solicited-ra-unicast

Mark Smith <> Thu, 09 July 2015 05:09 UTC

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From: Mark Smith <>
Date: Thu, 9 Jul 2015 15:08:58 +1000
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Subject: Re: [v6ops] new draft: draft-yc-v6ops-solicited-ra-unicast
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I support the adoption of this draft.

One thought I have though is that I wonder if just changing solicited
RAs from multlicast to unicasts would result in an increase in the
number of multicast RSes?

It was my understanding that the idea behind multicasting solicited
RAs was to also update hosts who were soon going to be issuing
multicast RSes, which would then reduce the volume of multicast RSes.
If those hosts are now not going to receive the multicast solicited
RAs, then they I think they would now be issuing multicast RSes more
often where as in the past they wouldn't.

As a side note, the radvd RA daemon already supports a UnicastOnly option:

UnicastOnly on|off
Indicates that the interface link type only supports unicast. This
will prevent unsolicited advertisements from being sent, and will
cause solicited advertisements to be unicast to the soliciting node.
This option is necessary for non-broadcast, multiple-access links,
such as ISATAP.

Default: off

The issue of increased numbers of multicast RSes would be avoided on
e.g., ISATAP networks because hosts using that use static, DHCPv4 or
DNS lookups to discover routers instead of multicast RSes.


On 7 July 2015 at 21:47,  <> wrote:
> A new draft has been posted, at Please take a look at it and comment.
> _______________________________________________
> v6ops mailing list