[Sis-SCPS-INTEREST] Linux\TAP SCPS setup help please!

[Feighery, Patrick D.]

Well the best to figure out what is going on is if you can provide the
following
 
    1)  For the gateway was configured/compiled (e.g., the ./configure
options)
    2)  A copy of the rfile you are using.
    3)  A simple topology map including IP addresses.
 
Best Regards
 
    Pat
 


________________________________

	From: sis-scps-interest-bounces at mailman.ccsds.org
[mailto:sis-scps-interest-bounces at mailman.ccsds.org] On Behalf Of Lyles
Robin
	Sent: Wednesday, May 24, 2006 10:26 AM
	To: 'sis-scps-interest at mailman.ccsds.org'
	Subject: [Sis-SCPS-INTEREST] Linux\TAP SCPS setup help please!
	
	

	Hi,

	I'm in need of a little help!

	I'm working on a project at the moment that is looking at how
SCPS affects the performance of TCP over a particular satellite link
which is modelled by our in house network emulator.

	I have installed the latest version of SCPS exactly as the
"Compiling for Linux 2.4 Based Kernels - TAP" part of the installation
guide tells me to on Linux machines with kernel 2.4.18-3.

	I have set it up on a simple 4 node network (A---B---C---D)
with a source (A),destination (D) and SCPS on nodes B and C acting as
the SCPS gateways (with the link between B and C being the emulated
satellite link with delay of 270ms).

	I load the gateway executable (in the bin directory) on the
nodes fine and it starts up and sets up aif, bif and the bridging
without any errors. I can ping between A and D no problem. 

	I decided at this point to setup a test very similar to the one
I have seen in the http://www.scps.org/Documents/SCPStests.PDF document
- the "2Mbps corruption test" to make sure I had it all setup
correctly. 

	I setup the test with a Link Bit Error Rate of 1.00E-06 which
should show a difference in throughput between TCP and SCPS. However,
the FTP transfer completes successfully but both TCP (on its own) and
SCPS give exactly the same transfer speed. 

	I investigated a bit further on the net and found that I should
be seeing option 20 in the SYN, SYN ACK if SCPS has been negotiated
properly, however when I run through ethereal I don't see this option
anywhere which suggests SCPS isn't actually being used at all?! The
rfile I am using is very similar to the default one and I am pretty
much out of ideas as to what I am doing wrong. As far as I can tell
from all the documentation I have read through I have set up everything
I need to which is why I am asking for a little help! Can anyone shed
some light on what I am doing wrong or if I am missing out something
vital! - I hope I have given you enough information!

	Thanks

	Robin

	 

	Robin Lyles
	Graduate Engineer, COM-Mobile Secure Information
	
	QinetiQ
	Bldg PC Rm 320
	Malvern Technology Centre
	St. Andrews Road, Malvern
	Worcestershire, WR14 3PS

Tel: 

01684 894605 

Email: 

rlyles at QinetiQ.com 

Fax: 

01684 896247 

Web: 

www.QinetiQ.com <http://www.qinetiq.com>  

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