Now, how about this to move things forward: We replace the quoted text/section with the following added into section 5.4
"A MAP-E CE provisioned with only the IPv6 address of the BR MUST disable its NAT44 functionality and treat the point-point tunnel interface as active for IPv4 forwarding." In case we want to proceed with the argument, it is continued inline... On 25 November 2013 13:39, Ole Troan <[email protected]> wrote: > Wojciech, > > > You're apparently missing some key points: > > that's not uncommon. ;-) > > > 1. It's a functional requirement of a CPE, specifying how the CPE > behaves with a case of NOT having an IPv4 address. What is the to be the > bahviour of a MAP CPE without one? > > just like if it didn't get an IPv4 address on native Ethernet. > Now, the way MAP's forwarding rules have been modelled, the IPv4 default route follows the IPv6 BR address. Hence, the presence of the IPv6 address equates to the presence of a v4 default route, accessible via the tunnel to the BR. In none of the v4 auto tunneling technology in use here is it a requirement for the tunneling router to have some operator assigned IPv4 address on an interface to be able to forward packets on it. > > > 2. This is NOT about configuring a ds-lite CPE > > my understanding was that the CPE had to be provisioned for this mode, > possibly as a separate MAP domain. and that the BR must also act as a CGN. > One doesn't need a DS-Lite CPE to be able to send IPv4inIPv6. > > > Throughout, its still not been answered what is the downside of having > this functionality of a *MAP CPE*? > > it adds yet another variant. > what's wrong with provisioning the DS-lite option when you want this > behaviour? > Is DS-Lite required to configure a MAP CPE, or to enable IPv4inIPv6 on a router? > or if you want overflow from MAP to DS-lite? > I didn't bring up overflow - not sure why you added it. > > I don't get the benefit of what you are suggesting. > Clearly, but there are multiple as mentioned (not least, the ability for the operator to actually turn off NAT44 on the user's CPE for t'shooting purposes). Cheers, Wojciech. > cheers, > Ole >
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