Discussion list for thrulay, a network testing tool

Hi Richard,

        I
began testing this morning, and the VLAN feature works as expected (the
vconfig command does raise a warning ('could not open /proc/net/vlan/config')
when configuring the first VLAN sub-interface, but it does not seem to
affect the operation of the VLANs). During testing I noticed a slight decrease
in throughput using Thrulay, typically around 1-2 Mbit/s, when running
through a VLAN sub-interface as opposed to using the 'normal' non-VLAN
interface (both active on the same physical interface, N.B. the vconfig
command will only create a VLAN sub-interface on an interface that is up).
I also tested the mapping of the DSCP
bits (set using the -D option of Thrulay) into the VLAN QOS bits using
the 'vconfig set_egress_map' and 'vconfig set_ingress_map' commands, and
verified that they were being set correctly using Wireshark (through a
monitor port on a switch). However the Thrulayd daemon does not
appear to map DSCP bits received from a client, into frames transmitted
back to the client, which obviously prevents me from performing a throughput
test using the same QOS level in both directions. Hopefully the Thrulay
developers may be able to identify the cause of this.

        Many
thanks for building VLAN support into NPT, I'm sure that many people will
find it useful.

Derek.

Richard Carlson <>

13/08/2008 02:57 AM

To
cc
Subject	Re: VLAN support

Hi Derek;

Any work on if I got the vlan support installed?  I'm
update the web page with this new system and need to sent out an email
to the ndt-announce list.  I'm wondering if I should mentioning that
vlan support is now included.

Regards;
Rich

On Aug 6, 2008, at 7:24 PM, 
wrote:


Hi Richard, 

        Many thanks for responding so quickly! I am
downloading the ISO as I type, and will report back with results of testing
as soon as possible. 

        Thanks Richard.

Richard Carlson <>

06/08/2008 10:11 PM

To
cc
Subject	Re: VLAN support

Hi Derek;

I'm currently working on an ISO update so I built/installed the 
vconfig utility on this new image.  I also updated some of the tools
and applied a security patch that effects remote management via 
SSH.  I'm waiting for some feedback on the SSH issue so I haven't
released this version yet (the issues is that old images are 
generating weak SSH keys, and my testing shows this new image fixes 
that problem but I want confirmation from the user that reported the 
problem).   If you want to try it out you can download a new v1.10
iso image from 
http://people.internet2.edu/~rcarlson/ndt-files/NPtoolkit_v1.10.iso
.

This image should support vlans, and I would be interested in hearing 
if this is true or what steps you need to take to make them work 
(does the 8021q module load automatically).  Thanks for your support
and interest.

Regards;
Rich

At 08:00 PM 8/4/2008, you wrote:

>Hi Richard,
>
>         Could you please advise whether VLAN support
(i.e. 
> inclusion of the Vlan package containing the vconfig utility) is to
> be provided in a future release of the NPT to allow testing of specific
VLANs?
>
>         Thanks Richard.
>
>[]
>
>
>
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------------------------------------



Richard A. Carlson                
             e-mail: 
Network Engineer                
               phone:  (734)
352-7043
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                    fax:
   (734) 913-4255
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TO THE ADDRESSEE - this email is for the intended addressee only and may contain information that is confidential.
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P: 734-352-7043
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