> From: Brandon Allbery [mailto:allber...@gmail.com]
> 
> It
> depends on whether the OS actually tears down the interface while
> renegotiating or leaves it valid;

Acknowledged:  It's OS dependent.  If you jump from one AP to another, on the 
same network with the same SSID, and get the same IP again via DHCP, some OSes 
dump the TCP stack, and apparently some don't.

But I didn't test every OS, so I don't know which ones behave which way.  In 
fact, for several years, I've always deployed AP's that support roaming, so I 
haven't even tested on any modern OSes.  I know around 2006, XP dumped the TCP 
stack, so I went to roaming AP's, and consider the problem solved.  I don't 
know anything more current than that.

If your AP's support roaming, then the problem is irrelevant, regardless of 
client OS.
 
And there's another point, which I think probably doesn't matter 99.9% of the 
time:  You don't have to query DHCP again.  I've never had a situation that I 
cared about this behavior, but it's not inconceivable that sometimes it might 
matter for some environments.
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