Re: [Softwires] Unified Softwire CPE: draft-bfmk-softwire-unified-cpe

Hi Ole,

I think there is one more point, see inline ~~

On Sat, Dec 1, 2012 at 3:36 AM, Ole Trøan <otroan@employees.org> wrote:

> Med, et al,
>
> > Med: The rationale we adopted in this draft is as follows:
> >
> > * there are three major flavors: full stateful, full stateless, and
> binding mode
> > * all these modes can support assigning a full or a shared IPv4 address
>
> now you got me thinking, are these really the right modes from a CPE
> perspective?
>
> let me try to explain, with my CPE implementor hat on, what "modes" would
> make sense?
>
> - NAT placement. do I need a NAT on the CPE or not?
>   (no NAT && no IPv4 address == DS-lite)
> - full IPv4 address assigned.
>   I can assign the IPv4 address to the tunnel endpoint interface, and use
> that address for
>   local applications, and as the outbound address of the NAT
>   (mechanisms: MAP, Public 4over6)
> - IPv4 prefix assigned:
>   I need to disable the CPE NAT, and use the assigned IPv4 prefix as my
> LAN side DHCPv4 pool
>   (mechanism: MAP)
> - Shared IPv4 address.
>   I must enable a local NAT, I cannot assign the IPv4 address on the "WAN"
> interface, but only use it
>   for the outbound side of the NAT.
>
> then there might be a sub-modes for "tunnel endpoint determination" i.e.
> how to determine an IPv6 tunnel end point address given an IPv4 destination
> address and port.
> 1) algorithmic (MAP)
> 2) configured (Public 4over6, LW46, DS-lite)
>
> and a sub-mode for IPv4 address configuration:
> 1) As "native IPv4"
>     (Public4over6, LW46)
> 2) Embedded Address
>     (MAP)
> 3) None
>    DS-lite
>

[Qiong] and a sub-mode for "source IPv6 address determiniation", how to
determine the encapsulated IPv6 source address.
1) algorithmic, LAN prefix + embedded IPv4 address/PSID in Interface
Identifier (MAP)
2) WAN IPv6 address (DS-Lite, LW46, Public 4over6)

Right ?

Best wishes
Qiong

>
> does this make sense?
>
> cheers,
> Ole
>
>
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>

-- 
==============================================
Qiong Sun
China Telecom Beijing Research Institude

Open source code:
lightweight 4over6: *http://sourceforge.net/projects/laft6/*
PCP-natcoord:* http://sourceforge.net/projects/pcpportsetdemo/ *
===============================================