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1994-06-04
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Date: Tue, 12 Oct 93 04:30:01 PDT
From: Advanced Amateur Radio Networking Group <tcp-group@ucsd.edu>
Errors-To: TCP-Group-Errors@UCSD.Edu
Reply-To: TCP-Group@UCSD.Edu
Precedence: Bulk
Subject: TCP-Group Digest V93 #265
To: tcp-group-digest
TCP-Group Digest Tue, 12 Oct 93 Volume 93 : Issue 265
Today's Topics:
BPQ 406 K
lzw implementation problems.
Subscribe
Send Replies or notes for publication to: <TCP-Group@UCSD.Edu>.
Subscription requests to <TCP-Group-REQUEST@UCSD.Edu>.
Problems you can't solve otherwise to brian@ucsd.edu.
Archives of past issues of the TCP-Group Digest are available
(by FTP only) from UCSD.Edu in directory "mailarchives".
We trust that readers are intelligent enough to realize that all text
herein consists of personal comments and does not represent the official
policies or positions of any party. Your mileage may vary. So there.
----------------------------------------------------------------------
Date: Mon, 11 Oct 93 20:49:47 GMT
From: nick@plains.demon.co.uk (nick button)
Subject: BPQ 406 K
To: tcp-group@ucsd.edu
Hi there,
I've uploaded version 4.06K of G8BPQ node software for the PC and the kantronics
Data-Engine to ucsd.edu:/hamradio/packet/tcpip/incoming .
The files are BPQ406K.ZIP and KANT406K.ZIP respectively.
73
de Nick G4IRX
.. ick..
==========================================
| Nick Button, Nottingham, England |
| Internet:- nick@plains.demon.co.uk. |
==========================================
------------------------------
Date: 11 Oct 93 15:12:49 CDT
From: Jack Snodgrass <kf5mg@vnet.IBM.COM>
Subject: lzw implementation problems.
To: <TCP-Group@UCSD.Edu>
I'm looking at adding lzw sockets to pop3 sessions and telnet
sessions. I'm a little confused on how the lzw stuff works.
Using the smtp code as a base, it looks like the only thing you
really need to do to add lzw compression to a socket is to issue the
lzwinit() command for a socket. The lzwinit command needs to know the
number of lzwbits and lzw compression method.
Is there anything else that needs to be done?
Is there a way to go from lzw type sockets to standard sockets?
I have sort of successfully added lzw compression to the POP3 code,
but there is a problem. Instead of sending a few tcp window sized
packets, the system sends dozens of 20 - 50 byte size packets. The
added overhead of the increased number of packets is greater than
sending the uncompressed pop3 data packets.
As for telnet sockets, I've added a TN_LZW option to the telnet
initialization stuff. When a client connects, the server sends a 'DO
TN_LZW' similar to the DO TN_ECHO command and does a lzwinit() to start
the compressed sockets. ( I need to figure out how to read a 'WILL
TN_LZW' from the client before I do the lzwinit(). ) The telnet client
get's the 'DO TN_LZW', starts the lzwinit() and and returns the 'WILL
TN_LZW' to the server.
I'm having all sorts of problems here. Seems like only one side is
doing the lzwinit() correctly. I'm getting lots of lzw protocol errors.
If I remove the lzwinit() call from both the client and server, my
debug messages say that both the client and server agree to the lzw
stuff and start the lzw stuff on the correct sockets. Can't figure out
what's going on when they actually do do the lzwinit(). I think that
one of them may being doing the lzwinit() call too early and getting
hosed when more non-lzw data is sent.
If anyone has any ideas on this please let me know. Also, am I going
about this the wrong way? Is there a way to add lzw compression to all
sockets ( related to a specified system ) instead of for each client/
server pair. Seems like this would be a better way to go. Has this idea
been looked at before and tossed? Thanks.
73's de Jack - kf5mg
Internet - kf5mg@kf5mg.ampr.org - 44.28.0.14
Worknet - kf5mg@vnet.ibm.com - work (817) 962-4409
AX25net - kf5mg@kf5mg.#dfw.tx.usa.na - home (817) 488-4386
------------------------------
Date: Mon, 11 Oct 93 10:02:10 CDT
From: mfoster@amoco.com (Michael H. Foster)
Subject: Subscribe
To: tcp-group@ucsd.edu
Subscribe
------------------------------
End of TCP-Group Digest V93 #265
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