On Mar 30, 2010, at 8:56 AM, Mohacsi Janos wrote:

> Dear All,
> 
> Sorry for crossposting.
> 
> 
> This proposal is the opposite with the principle how the DNS is developed a 
> while ago. The DNS is a highly distributed, hierarchical, autonomous, 
> reliable database with very useful extensions. This modification is proposing 
> lying about the existence of the record
> 
> The modification is proposed to hide the database record that is used for 
> communication. I am not favor such a modification since:
> 
> 1. I think we need evidence, that majority of the AAAA queries are going via 
> IPv6 (if the client has working IPv6 and the DNS zones has the necessary AAAA 
> for the zones).

This is clearly not the case.  

Linux clients in particular seem to always do AAAA as well as A queries: 
Netalyzr is an IPv4 service, (we detect IPv6 usage, its only a couple of 
percent and Netalyzr has a very geek-biased dataset), but there are a LOT of 
clients which are doing v6 queries on DNS as well as V4.

EG, a colleague had very problematic network connections from his parent's home 
back to ICSI, because the stupid NAT's built in DNS proxy (until he reflashed 
an update) was blocking AAAA queries.  

His linux host would do an A and an AAAA query and, until the AAAA query timed 
out, delay creating connections eg, through SSH, web browsing, etc.  An 
amazingly painful experience for him until he diagnosed it.

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