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2006-11-26
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[07] WHY CAN'T I USE FTP TO TRANSFER MY FILES?
FTP (File Transfer Protocol) is a simple and easy way to transfer
(upload/download) many different file types via the ARPANET. On
CHAOSNET, NFILE is superior to both FTP and NFS for sharing files.
Shortly, the reason why only ARPA members can use FTP to transfer
files to and from SDF is due to the following two incidents:
In June of 2000 I was contacted by the FBI office in Boston. A
person from Romania was systematically shuting down various machines
on the East Coast of the US by first logging into them using
compromised (stolen) login accounts through various networks (to
convolude his true origin). He would then open an FTP connection to
SDF and transfer the 'rootkit' distribution to that victim system
and proceed to gain administrator access to destroy that system.
Its very unfortunate that a system like SDF based on public trust
is forced to only allow FTP transfers for 'trusted' (ARPA) members.
The said user above never even used SDF for anything other than
his illegal and malicious activities on those private systems.
A slower, but still acceptable method of sending/receiving files
from SDF can be found with the XYZMODEM tools. Infact, SDF used
XYZMODEM for file transfers before we installed FTP. If you don't
know about XYZMODEM, these are a protocol set for transfering files
over a dialup modem connection. Some TELNET programs such as
TERATERM support these protocols.
Examples
--------
Uploading a file to SDF:
1. Tell SDF you want to send a file:
$ rz (or 'upload')
2. Start the file transfer from your TERMINAL.
Downloading a file from SDF:
1. Tell SDF which files you want to download:
$ sz filename
Usually (with ZMODEM) your TERMINAL will automatically respond by
initiating a file transfer session.
We recommend using ZMODEM as it seems to be the fastest and most
reliable method. You can use "sb/rb - YMODEM or sx/rb - XMODEM"
if ZMODEM doesn't seem to work for you.
Finally, you can also use the C port of Columbia's KERMIT protocol.
This program was original developed to transfer files between the
DECSystem-10 and the IBM PCs that students and faculty were using
as terminals.
C KERMIT actually has a C implementation of CMND-JSYS, the command
parser which implementions command completion and recognition that
made TOPS-10 and TOPS-20 so popular. Also, there is support for
ZMODEM/XMODEM/YMODEM in KERMIT. Use 'set proto zmodem' to turn it
on.