>>They still use the external address. It's just an HTTP connection to the
>>service's server and they use the source address from that request as
>>yours.
> 
> 
> Ah, I see.  However, you've still got to worry about updating too often
> -- I've never used these services before, but I saw a few years ago when
> I was looking at these things that DynDNS, at least, will terminate your
> account if you are constantly updating due to the load it puts on their
> servers if too many people do that.
> 

DHCP leases on most of the high-speed connections I've had have lasted a minimum 
of 24 hours.  Cox@home users have reported having the same IP for years (as long 
as modem didn't change).  So you really shouldn't need to update remote dynamic 
DNS services that often.
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