[151333] in North American Network Operators' Group
Re: Shim6, was: Re: filtering /48 is going to be necessary
daemon@ATHENA.MIT.EDU (Masataka Ohta)
Thu Mar 15 21:38:24 2012
Date: Fri, 16 Mar 2012 10:36:18 +0900
From: Masataka Ohta <mohta@necom830.hpcl.titech.ac.jp>
To: Jimmy Hess <mysidia@gmail.com>
In-Reply-To: <CAAAwwbXJ8B2ujVoGsW3KQm3WJg4Atp69DFUA5aXJDX7T+75QyQ@mail.gmail.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Jimmy Hess wrote:
>> If you are saying it's insane to use DNS to manage frequently
>> changing locations of mobile hosts instead of relying on
>> immobile home agents, I fully agree with you.
> and ultimately there must be something that
> doesn't have a circular dependency
It means there is no reason to deny to have immobile home agents.
> As for using DNS to manage frequently changing locations of mobile hosts,
> DNS is almost perfect for that -- it's just the sort of thing DNS is
> designed for,
Not at all, because a DNS client has no idea when its peer, a
mobile host, changes its location.
> depending on how frequent you mean by "frequently changing".
Assuming a mobile host changes base stations every 5 seconds
(moving at 144km/h with cell diameters of 200m) and old base
stations are still usable within 1 second after the changes,
a DNS client must check DNS servers every 0.5 second (reserving
0.5 second for RTT and possible retry).
Can you still say it almost perfect?
Masataka Ohta
