On Apr 15, 2013, at 5:35 AM, <[email protected]<mailto:[email protected]>> wrote: some service providers and services may remain in IPv4 for some time, while end users may demand these IPv4 services to be delivered over IPv6. The required info may be more than IPv4 addresses (port set). As for examples, IMHO, SIP server option and [Med] This is doable using option 21. The name can be resolved to an IPv6 or an IPv4 address. Nothing prevent from doing so.
NTP server option are potential customers for this usage. [Med] This is doable using dhcpv6. Why the use dhpv4-over-dhcpv6 is a must? There may be more, because demands are arising with time going on. [Med] I’m still not seeing any particular demand which cannot be honored using dhcpv6. Exactly right. DHCPv4-over-DHCPv6 is _not_ a must if you have a working IPv6 service infrastructure and are using stateless prefix mapping for IPv4 transport. Your home gateway can even answer DNS queries it receives on the local network over IPv4 by doing the lookups directly to the DNS server over IPv6—there is no reason at all why a configuration like this requires any DHCPv4 configuration options at all, even though it's supporting IPv4 in the home.
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