Path: utzoo!attcan!uunet!husc6!uwvax!rutgers!mailrus!umix!honey
From: honey@umix.cc.umich.edu (Peter Honeyman)
Newsgroups: comp.dcom.modems
Subject: Re: TrailBlazer and UUCP
Message-ID: <4585@umix.cc.umich.edu>
Date: 6 Sep 88 03:15:40 GMT
References: <4560@umix.cc.umich.edu> <168@arnold.UUCP>
Reply-To: honey@citi.umich.edu (Peter Honeyman)
Organization: Center for Information Technology Integration, Univ of Michigan
Lines: 45
UUCP-Path: {uunet,rutgers}!umix!honey

Dave Arnold writes:
>What is P?

select protocol.  there's also X, but i honey danber doesn't
support it.  (and i forget what it did.)

>>  stripping the 'g' frame would require spoofing the
>> upper level as well.
>
>Well... I though about this, and I don't understand Peter, why?

your confusion is justified -- not even the higher-layer spoof
can signal end of file.  eof can probably be indicated with tb
trickery, obviating 'g' framing,  but read on.

>If 'e' was used why would the tb+ have do do transaction protocol
>spoofing?

it wouldn't.  but 'e' is a bad idea:  a checksum is necessary to
insure end-to-end reliability, and flow control (the window) is
important to insulate against serial port overflow.

i view with some skepticism the myriad proposals for high-tech
spoofery.  admit it: the existing uucp spoof gives stupendous
throughput on voice-grade lines.  'g' imposes an overhead of
less than 10%, and offers guaranteed compatibility with all
known versions of uucp, for all time.  sure, you can beat 'g',
but i maintain that you shouldn't try.

also, i have some idea what it takes to make the modem spoof.
time and money, you are thinking, and you're right.  lots of
time, ergo lots of money.

on the other hand, proposals to pack mail files into larger
bundles appear fruitful, but this is necessarily a host
concern.

it seems unlikely to me that telebit will do much to improve the
uucp spoof.  telebit has captured the high-speed uucp market,
and is proceeding to saturate it.  i would guess that their next
move will be to go after bigger fish.

capitalism, ya know?

	peter