On Mar 4, 2011, at 10:39 AM, Keith Moore wrote:

> I've always assumed that privacy addresses were meant to be ephemeral.   
> Otherwise, there's no point to them.

Ephemeral, yes. On what timeframe - Christian, my understanding is that Windows 
changes them daily. Correct?

There are a couple of other timing alternatives. One is to create a new address 
for every TCP session. If you think that's a good idea - and it does have its 
merits - I'll encourage you to think through the implications of Duplicate 
Address Detection. I think you'll find hosts need to have a pool of vetted 
addresses in their pockets in order to do things like web access.

A better alternative might be to change the address once a minute or once an 
hour. The value of doing so would be to side-step an attack without betraying 
to the attacker that you know you're under attack.

Another alternative would be to change addresses at some nominal rate (such as 
daily) but feel free to change addresses if you perceive yourself to be under 
attack.
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