Re: "DNS-4to6 automatic mapping" - No more DNS-ALGs & 6then4 DNS queries

[Nathan Ward <v6ops@daork.net>]

On 26/11/2007, at 10:42 PM, Iljitsch van Beijnum wrote:
> The question is: do we really have a problem?
>
> Yes, people recommend turning off IPv6 on forums here and there, but  
> this used to be because there were some DNS servers out there that  
> would reply with an error when queried for AAAA records. That  
> problem has been solved 99.9%, unless I'm mistaken. Also, apparently  
> turning off IPv6 helps agains all kinds of problems that are  
> provably IPv6-unrelated.
>
> I think any effort would be better spent by making sure OSes don't  
> send AAAA queries when there is no IPv6 connectivity.


I agree with this.
The major case that I see is Windows firing up 6to4 when it has a non- 
RFC1918 address, when it's connectivity is filtered or NATed.

What other common cases are there, that are not due to  
misconfiguration (i.e. IPv6 `default' route configured on an interface/ 
link without IPv6 transit doesn't count).

--
Nathan Ward