On Apr 30, 2004, at 7:20 AM, Edward Lewis wrote:
# Regardless of what is in a zone, there should be a server for it available
# on all network layers, e.g., IPv4 and IPv6, in common use. A zone's contents
# should appear the same on all servers, hence, no matter what network layer
# used to query the servers, the contents of the answer is substantially the
# same.
"In common use" - means that even if you don't have a v4 infrastructure anymore, you should consider asking someone with one to server your zones for you on a v4-enabled server.
I think this is already covered in the current text which does not say that you need to 'own' all DNS servers for your zone.
"Substantially" - because of the glue question and the truncation issue in DNS, you can't specify that the answer "is" the same.
Another case to consider is the the query type any. If my v4 recursive server does not share the same memory (RAM) as my v6 server, chances are strong that the caches in the two will differ over time. QTYPE ANY queries ask for "what you have" about a name, not the complete data at the name (as far as an authoritative server is concerned). It's reasonable to consider that the exact responses from the two servers will differ, regardless of the fact that they are on different network layers.
Thank you for this clarification I now understand you point. We might want to add text that only focus on those issues.
This is an operational issue that is somehow different from the one described in the transport guideline document.
I think it should go into the ipv6-dns-issues document, which is the one you commented on first,
so I withdraw my previous comment.
- Alain.
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