Re: [BEHAVE] RFC6147 and RFC7208 interoperability issues

[Christian Huitema <[e-mail]>]

On 2/7/2022 9:18 AM, David Conrad wrote:
> As far as I can tell, Klaus has identified a specific issue in which existing IETF specifications are deficient in order to facilitate interoperability in a specific protocol when NAT64 is in use.

Yes.

We have an unresolved tension between recommending end-to-end solutions 
and recommending more processing in DNS64, which means the IETF will 
probably need to charter some work if we want to publish a consensus 
document. But the current discussion yielded both ideas and data.

According to Klaus, practical deployments of NAT64 in ISP use WKP, not 
NSP. That's interesting. I trust Klaus on that one, and it makes sense: 
ISP want to avoid breakage, and if using WKP is less likely to cause 
breakage than using NSP, they will use that. That also means that the 
job of the application writer becomes simpler: it is much easier to have 
a special case for WKP than to invent a way to learn the NSP. This could 
lead to an interesting feedback loop, in which more applications working 
with WKP means even less incentives for ISP to use NSP. This kind of 
loop is common and powerful. And maybe that's something that we can 
document.

-- Christian Huitema