ftp over transparent satellite link (with 3COM-Routers)

From: Dr. Bettina Pieper (bettina.pieper@rektoramt.uni-ulm.de)
Date: Fri Mar 13 1998 - 11:10:29 EST

Hello,

I am still struggling with my problem to have an efficient data-rate for
ftp over a transparent 384 kb/s satellite link:

The configuration is as follows:

PC1 - Router 1 - Sat-Modem 1 <--- EUTELSAT ---> Sat-Modem 2 - Router 2
- PC2

PC1 and 2 with Ethernet-Interface (10 Mb/s)
Router1 3COM, NetBuilderII with RS449-Interface; Software Version
7.2
Router2 3COM, NetBuilder Remote Office 227 with RS449-Interface;
Software Version 7.2

Some tests:
Test configuration 1:
PCs running OS/2 2.11; IBM TCP/IP version 2; PPP on the Router
result: ftp of the same 350 kB-File in 96 s, 6.5 s, 9.6s, 140 s, ...
that means no constant rate

Test configuration 2:
PCs running with Linux-Boot-Disks (Kernel vers. 2.0.?); PPP on the
Router
one test with TTCP with 1024 byte Packets: 23 kB/s = 50% of the max data
rate
(I will keep on testing with the Linux config.)

Any idea for "the best" configuration of the Routers - maybe as a
Bridge, compression y/n and which one (Per Packet or History), etc. and
maybe another ftp-Software.

I would appreciate help very much.

Bettina Pieper 

--
----------------------------------------------------------------
 University of Ulm, DR-1
 Dr. Bettina Pieper
 E.C./R&D Management in the President's Office
 D-89069 Ulm

 phone:  +49-731-50-22010/2011
 fax:    +49-731-50-22016
 e-mail: bettina.pieper@rektoramt.uni-ulm.de
 http://www.uni-ulm.de

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