ndt-users list created

["chet" <>]

----- Original Message ----- 
From: "Richard Carlson" 
<>
To: "chet" 
<>;
 
<>
Sent: Thursday, October 27, 2005 9:27 PM
Subject: Re: Spurious results


> >If I put a HUB in the way then these results drop by around 20Mb/s, these
> >are not the exact results as I'm not in the office now
>
> The HUB is a shared device, so the hosts will drop to half-duplex.  Half
> duplex connections will run at 60 - 70 % of the link capacity.  This is
due
> to the Ethernet CDMA-CA protocol and should be expected.  (I'll note here
> that the half/full detection algorithm probably doesn't work right now so
> you'll get a report that the path is full duplex).
>

I will change from a Hub and put them into a cat 2900, full duplex mode

> >My set up for back-to back results are both server and PC set to 100 half
> >duplex, server has twin p3 500 with 512 meg of ram, my laptop is a
Pentium
> >p4 with 256 MB of ram
> >
> >If I go across a VLAN the Cat 5509 has it ports set to 100 half duplex
and
> >the Cat 2900 is set to 100 half duplex, if I set them all to 100 full
> >duplex I get the following: -
> >
> >Checking for Middleboxes . . . . . . . . . . . . . . . . . .  Done
> >running 10s outbound test (client to server) . . . . . Server busy:
Please
> >wait 30 seconds for previous test to finish
>
> This indicates that the client can't reach the server.  Check the IPTABLES
> to ensure that hosts on this VLAN can access the server.  Or check for
> other firewalls that are blocking port 3002 (3003 is getting through
> because the middlebox test is working).  Also see below for some debugging
> steps.
>

The client and server have been the same throughout, all I changed was to
full duplex for the above to occur, but I guess this is down to the Hub
marking them down to half duplex

Thanks

Martyn