Re: IPv6 NAT?

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On 19 feb 2008, at 10:02, Dan Wing wrote:

> It would be interesting to write it down, and to see what
> would break if the IP stack acquired and provided a fresh
> v6 address to every new connection.  Maybe nothing would
> break, which would be great.

You really don't want to do that for stuff like the web where you can  
easily end up setting up a dozen new TCP sessions in a second. (Web  
designers use insanely wasteful techniques with multiple external  
javascripts and style sheets per page, often loaded from different  
domains, not to mention the persistent use of spacer images.)  
Duplicate address detection takes too much time to make this useful,  
and the creation of such a large number of addresses makes DAD all the  
more important.

You also don't want to do it for applications that require referrals,  
such as peer-to-peer.

Current address privacy mechanisms change addresses at certain  
intervals, often 24 hours. Last time I checked this was enabled by  
default on Windows (Vista and on XP if IPv6 is enabled) but not on any  
other system, although I believe they all support it.

The reason for this mechanism is not that two sessions can't be  
attributed to the same host, but that when a host moves it can't be  
tracked by its MAC address that would otherwise be in the lower 64  
bits of its IPv6 address when using stateless autoconfig.
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