Re: [Softwires] MAP compatibility with DS-Lite

Wojciech Dec 写道:
>
>
>
> On 20 November 2013 20:54, Simon Perreault 
> <simon.perreault@viagenie.ca <mailto:simon.perreault@viagenie.ca>> wrote:
>
>     WG,
>
>     draft-ietf-softwire-map-08 contains this:
>
>     7.3. Backwards compatibility
>
>     A MAP-E CE provisioned with only the IPv6 address of the BR, and with
>     no IPv4 address and port range configured by other means, MUST
>     disable its NAT44 functionality. This characteristic makes a MAP CE
>     compatible with DS-Lite [RFC6333] AFTRs, whose addresses are
>     configured as the MAP BR.
>
>     In view of the recent discussions on provisioning, this
>     functionality strikes me as useless. There would be no reason for
>     an ISP to use such provisioning. A unified CPE would just do
>     DS-Lite if that's what's available.
>
>     I suggest to remove that section.
>
>
> You seem to equate ds-lite to being only there if it uses ds-lite 
> dhcpv6 extensions, which is not correct.
> Consider the case where a MAP deployment has a need (for whatever 
> reason) to direct some CPEs to an AFTR (stateful NAT). Instead of 
> rolling out Ds-lite DHCP extensions all over, it is trivially simple 
> to achieve the desired effect with the above MAP CE behaviour in place.
> This does not mean that those who want to use DS-lite dhcp extensions 
> cannot do so, if available. But it does mean that those who deploy 
> MAP, don't have to take care of mandating ds-lite dhcp extensions 
> "just in case" all over the shop.
> As such, the functionality is IMO useful, and almost trivial to 
> achieve in an implementation.

Agree with Woj and an exmaple is demostrated in Section 4.1 of 
http://www.ietf.org/id/draft-xli-softwire-map-testing-02.txt

Regards,

xing

>
> -Wojciech.
>
>
>     Simon
>     -- 
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