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PA2AGA > TCPDIG 30.08.96 04:02l 212 Lines 7095 Bytes #-10903 (0) @ EU
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Subj: TCP-Group Digest 96/174D
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Subject: TCP-Group Digest 96/174D
X-BBS-Msg-Type: B
experimentation.
-----------------------------------------------------------
Brian A. Lantz http://www.lantz.com brian@lantz.com
REAL PORTION of Microsoft Windows code:
while (memory_available) {
eat_major_portion_of_memory (no_real_reason);
if (feel_like_it)
make_user_THINK (this_is_an_OS);
gates_bank_balance++;
}
------------------------------
Date: Tue, 27 Aug 1996 08:12:32 -0500
From: "Steven R. Sampson" <ssampson@othello.tinker.af.mil>
Subject: PPP/SLIP in connected AX25?
Brian Kantor wrote:
>
> Karn>A Motorola BitSurfer and an ISDN line.
>
> BitSurfRs are $260 mailorder in the USA. PacBell wants $200 for the
> ISDN installation and $24 for the first month, which will give you 112
> Kb/s or better. That's $500 with enough left over to pay the taxes AND
> buy myself a nice dinner.
Well I paid $30 for a 28.8 k that normally gets me 21 k. The problem
with internet is it doesn't have anything of value that I need to
spend $500 for :-) Sorta like 145.01 only faster. Once you get all
rigged up, you wonder why you went to all the trouble. Although I
do like the virtual ant farm...
I'm ready to go back to UUCP and straight email :-)
Steve
------------------------------
Date: Tue, 27 Aug 96 14:20:00 -0000
From: mikebw@bilow.bilow.uu.ids.net (Mike Bilow)
Subject: PPP/SLIP in connected AX25?
Phil Karn wrote in a message to Mike Bilow:
>It produces abominable results unless the TNC is very very smart and
>sends packets broken on the SLIP/PPP framing boundary only. If you do
PK> Seems to me the easiest way to handle this is to use the
PK> idle-time packetization feature, where the TNC keeps
PK> collecting packets from the serial interface until there's a
PK> pause. Since the SLIP/PPP packets come out of the computer
PK> as a continuous burst, this should do the trick.
PK> At least I *think* AX25 TNCs provide this feature -- right?
PK> It's been a long time since I've used one. Maybe I'm
PK> thinking of X.25/X.28/X.29 PADs...
TNCs in conventional (not KISS) mode will transmit in three cases: (1) when a
particular character, usually CR, is sent, (2) when a sufficient amount of
unsent data has accumulated to approach PACLEN, and (3) when the CPACTIME
timer
expires after a period of idleness. However, most TNCs set CPACTIME to zero
by
default, disabling this feature.
-- Mike
------------------------------
Date: Tue, 27 Aug 96 14:18:00 -0000
From: mikebw@bilow.bilow.uu.ids.net (Mike Bilow)
Subject: PPP/SLIP in connected AX25?
Phil Karn wrote in a message to Mike Bilow:
PK> Actually, the MTU could be anything you want, as the TNC
PK> will chop it up into paclen-sized frames over the air. Of
PK> course, the round trip delay could be quite long at 1200
PK> baud, meaning lots of spurious retransmissions until the TCP
PK> inside the Winsock stack adapts...
This would break Karn's Algorithm. :-)
-- Mike
------------------------------
Date: Tue, 27 Aug 1996 14:21:38 -0700 (PDT)
From: Phil Karn <karn@qualcomm.com>
Subject: PPP/SLIP in connected AX25?
>This would break Karn's Algorithm. :-)
Why? This was precisely the kind of thing it was designed for. Though
TCP timestamps are now a better solution to the problem.
Speaking of which, how widely are TCP timestamps supported? I've seen
them in BSDI, and I did them in NOS a while ago.
Phil
------------------------------
Date: Tue, 27 Aug 1996 10:55:17 -0400
From: "Louis A. Mamakos" <louie@UU.NET>
Subject: PPP/SLIP in connected AX25?
> To: grahamb@peachy.apana.org.au, karn@qualcomm.com
> cc: tcp-group@ucsd.edu, terry@perf.no.itg.telstra.com.au
> From: brian@nothing.UCSD.EDU (Brian Kantor)
> Subject: Re: PPP/SLIP in connected AX25?
>
> Karn>A Motorola BitSurfer and an ISDN line.
>
> BitSurfRs are $260 mailorder in the USA. PacBell wants $200 for the
> ISDN installation and $24 for the first month, which will give you 112
> Kb/s or better. That's $500 with enough left over to pay the taxes AND
> buy myself a nice dinner. If I promise to keep the service for two
> years, they'll even waive the installation fee.
>
> And that's why I'm not active in ham radio much any more either.
>
> Of course, I do this for a living, which is why I think my employer
> should pay for the whole thing anyway. Who needs a busman's holiday?
I've got a 56K frame relay connection to the Internet, with an
inexpensive Ascend Pipeline 50 LS56 router to the home ethernet. This
works so much better than packet radio, that the TNC hasn't been
turned in in 5 or 6 years. In fact, a V.32 modem worked so much
better than packet radio and was what killed my packet station. I'm a
little luckier than Brian, in that my employer pays for this. But if
you're willing to put up with half the performance, you can just spend
$150 and get a V.34 modem. Combined with a $19.95/month flat rate
PPP ISP connection..
And that's why I'm not active in ham radio much any more either.
Now, having multi-hundred kilobit datalinks would be interesting, and
something I won't have for a while off-the-shelf.
louie
wa3ymh
------------------------------
Date: Tue, 27 Aug 1996 14:30:09 -0700 (PDT)
From: Phil Karn <karn@qualcomm.com>
Subject: PPP/SLIP in connected AX25?
>Now, having multi-hundred kilobit datalinks would be interesting, and
>something I won't have for a while off-the-shelf.
The local cable company (which has been trenching the streets just
about everywhere for the past year) is mumbling something about cable
Internet access coming to San Diego by the end of the year. They're
tossing around prices like $19.95 or $29.95/mo flat rate, modem
included.
That certainly raises the ante, eh?
Phil
------------------------------
Date: Tue, 27 Aug 1996 16:38:11 -0400
From: Brian Coggins <bc@digital.net>
Subject: PPP/SLIP in connected AX25?
Brian Kantor wrote:
>
> Karn>A Motorola BitSurfer and an ISDN line.
>
> BitSurfRs are $260 mailorder in the USA. PacBell wants $200 for the
> ISDN installation and $24 for the first month, which will give you 112
> Kb/s or better. That's $500 with enough left over to pay the taxes AND
> buy myself a nice dinner. If I promise to keep the service for two
> years, they'll even waive the installation fee.
Well, that may be the case in California, but here in Leesburg, FL, I
have the choice of:
1. Paying $$$$ to run a line from the ISDN switch in Ocala (~45 miles)
to my house.
2. Paying $$$$$ to upgrade the switch in Leesburg.
To be continued in digest: tcp_96_174E
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