On Jan 9, 2017, at 07:51, Templin, Fred L <[email protected]> wrote:
> 
> See below for a new draft that proposes to update RFC4861 and RFC4191 to
> permit the inclusion of Route Information Options in Redirect Messages.
> This represents a backward-compatible extension to the IPv6 ND Redirect
> function. Please review and comment on the list.
> 
> <https://tools.ietf.org/html/draft-templin-intarea-rio-redirect>

p1. I’m interested to see what V6OPS will think of this.

p2. Section 3.3, Host Specification says this:

>>    In light of these considerations, a "Type C" host that receives a
>>    Redirect message containing RIOs adopts the combined behaviors of
>>    both of these specifications.  Namely, the host updates its neighbor
>>    cache entry for the Target and updates its routing table per the
>>    included RIOs.  If the Destination address is not the unspecified
>>    address, the host further updates its destination cache.
>> 
>>    Note that "Type A'" and "Type B" hosts ignore any RIOs and process
>>    the Redirect message according to Section 8.3 of [RFC4861].

And I wonder if you have considered the possibility of a “Type D” host, which 
in my conception would be capable of *only* processing RIO options that appear 
in ND Redirect messages and *not* in RA messages. I’m not sure that’s a type of 
host we want to encourage, but the idea of its possibility was one of the first 
things that sprang to mind when I contemplated the reasons why so few Type C 
hosts are currently deployed in the wild after more than a decade since RFC 
4191 was published.


--james woodyatt <[email protected]>



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