Hello All, would like to get your feedback regarding a possible change to the way IPv4 addresses are mapped into the MAP-T DMR prefix. The current text, http://tools.ietf.org/html/draft-ietf-softwire-map-t-01#section-5.4 , follows RFC6052, and sees the IPv4 address inserted after the prefix. This aligns naturally with any/all existing NAT64 implementations, i.e. in a non-shared-address domain, a MAP-T CE would work with any regular NAT64 BR. A direct consequence of following RFC6052 is that, in cases where the prefix is shorter than /64, it results in some "bit spreading" of the IPv4 address across the u-byte. See http://tools.ietf.org/html/rfc6052#page-5. This is likely to be cumbersome operationally.
An option for simplifying this, and the change proposal seeking your feedback, would be to specify that the DMR should be a /64 prefix, or at least to make a recommendation to that effect in the specification. Feedback? Regards, Woj.
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