Re: [v6ops] I-D Action: draft-ietf-v6ops-6to4-to-historic-07.txt

[David Farmer <[e-mail]>]

On 11/10/14, 23:44 , Brian E Carpenter wrote:
> This is intended to incorporate the result of today's discussion.
> Please let the authors know if we got it wrong.
>
>     Brian

I wasn't at the IETF Meeting so I don't know if you have the correct 
result from that discussion.  However, I believe the result is 
consistent with my understanding of the consensus on the v6ops list. 
Further, I support deprecation of Anycast 6to4, and the general take of 
the Draft.

But, I feel the Draft should also either update or replace RFC6343. 
Minimally, I think it is important for there to be a metadata linkage 
between RFC6343 and the Draft.  I would suggest a formal update to 
Section 4 of RFC6343 substituting the use of Router 6to4 in place of 
Anycast 6to4.

Regardless, Section 4.5 of RFC6343 recommends the use of 192.88.99.1 as 
the IPv4 source address for Return Relay traffic, this no longer seem 
appropriate with the deprecation of 192.88.99.1, the prefix 
192.88.99.0/24, and Anycast 6to4 in general.  The 6th paragraph of 
Section 4 of the Draft discusses Return Relays and references Section 
4.5 of RFC6343, I believe the intent is that "content providers might 
choose to continue operating such a relay", but I think the 
recommendation regarding the use of 192.88.99.1 as the IPv4 source 
address of such traffic, contained in Section 4.5 of RFC6343 could be 
confusing and is no longer appropriate.

The draft says RFC6890 should be updated to remove "the 6to4 relay 
anycast prefix (192.88.99.0/24)", but RFC6890 doesn't need to be 
updated.  RFC68980 created "Special-Purpose IP Address Registries", no 
update to the RFC is necessary, IANA only needs to update the 
appropriate registry, which is already requested in section 5.  You may 
want to specifically call out the appropriate registry "IPv4 
Special-Purpose Address Registry" in section 5, but there is no need to 
update RFC6890.

Thanks

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