Re: Last Call: <draft-weil-shared-transition-space-request-03.txt> (IANA Reserved IPv4 Prefix for Shared Transition Space) to Informational RFC
2011-09-30 23:14:37 GMT
I read the document again today for the first time in a while and went through the more recent threads on the ietf list. I have 2 main comments. First, where did the /10 figure come from? Why not a /16? Some justification is needed for a particular figure. Second, this will break stuff, and even though the document talks about it some, we are dreaming IMO if we think talking about the problems (and encouraging implementations to fix things) will have any impact. At least not in the next few years. The problem will happen with stuff deployed today, or already in the pipeline for deployment. So, this will cause things to break. I don't feel good about that, even if one accepts the argument that neither approach is painless and we're gonna have breakage anyway. E.g., breaking 6to4 seems like a bad thing to do for IPv6. E.g.,: ingress links. DNS queries for Shared CGN Space addresses MUST NOT be forwarded to the global DNS infrastructure. This is done to avoid having to set up something similar to AS112.net for RFC 1918 private address space that a host has incorrectly sent for a DNS reverse- mapping queries on the public Internet [RFC6304]. This is totally unenforceable. We will be forced to deal with this. Existing software that is massively deployed will do this. Saying MUST NOT here is kind of like some IETF document saying you MUST NOT use NAT.(Continue reading)

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