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Date:      24 Nov 1999 17:53:13 -0800
From:      Matt Braithwaite <matt@braithwaite.net>
To:        Brad Karp <karp@eecs.harvard.edu>
Cc:        freebsd-mobile@FreeBSD.ORG
Subject:   Re: STRIP (was Re: richochet modems)
Message-ID:  <86g0xv49rq.fsf@zildjian.hq.alink.net>
In-Reply-To: Brad Karp's message of "Wed, 24 Nov 1999 20:27:26 -0500 (EST)"
References:  <199911250127.UAA11786@dominator.eecs.harvard.edu>

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On Wed, 24 Nov 1999 20:27:26 -0500 (EST), Brad Karp <karp@eecs.harvard.edu> said:
> 
>> Sorry, can you explain that a little more?  Are you saying that given
>> any two radios, you can set up a reliable byte stream between them
>> using AT commands?  
> 
> Say you have two hosts, A and B, each with a Ricochet, MAC addresses
> 0000-0001, and 0000-0002, respectively.
> 
> B can tell its radio:
> 
> ATS0=1
> 
> A can tell its radio:
> 
> ATDT0000-0002

Wow, I had no idea they carried modem emulation to such extremes!
ATS0=1, if anybody's out there who grew up with DSL, means ``answer''
the ``phone'' after one ``ring''. :-)

> So my overall point is: for a single hop of PPP over Metricom,
> there's no need to use STRIP at all. 

Unless, of course, you want multiple machines to be able to use the
same gateway (PPP over a reliable byte stream only allows one machine
at a time.).  Also, STRIP probably uses precious bandwidth a little
more efficiently than PPP does.

(These are really just quibbles, of course.  I'm not trying to defend
STRIP against HUMR; just pointing out that STRIP is useful for a
certain set of problems, though a smaller set.)

> And if you want multi-access, or multi-hop, the central ARP server
> STRIP requires makes HUMR more convenient.

Yeah.  I'm curious which has more users.  I've never run into any
Ricochet users who aren't using straight PPP.  

-- 
Matt Braithwaite                        Here in my car, I can only receive.


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