DAST: Iperf - multicast with iperf - Tom.Gorman --at-- draeger.com

[Mitch Kutzko <mitch --at-- ncsa.uiuc.edu>]

>Date: Tue, 1 Nov 2005 16:37:44 -0600
>To: Tom.Gorman --at-- draeger.com
>Subject: DAST: Iperf - multicast with iperf - Tom.Gorman --at-- draeger.com
>
>
>Contacting DAST re: Request for information about Iperf
>From: Tom Gorman <Tom.Gorman --at-- draeger.com>
>
>Subject: multicast with iperf
>
>Question/Comment:
>We at Draeger Medical make patient monitoring systems which use multicast
for more than 90% of our traffic.  The iperf tool seems suited to help with
testing, but at least on Windows 2000 the display does not correspond to
the documentation.  We never see "Joining multicast group" and a transfer
is always followed by ICMP message "destination unreachable".  A dump of
the packet shows the destination port is the issue.  The -i and -b switches
function as advertised.  We'd love to know if we are doing something wrong.
 Ethereal traces confirm the transfers.
>How significant are the values following the -l switch? If the server
receives packets of a size different from what it expects, does it ignore
the packet? Our monitors can transmit packets of various sizes.
>Thank you very much.
>
>
--
Mitch Kutzko | mitch --at-- dast.nlanr.net | mitch --at-- ncsa.uiuc.edu | 217-333-1199
Project: http://dast.nlanr.net  |  Personal: http://hobbes.ncsa.uiuc.edu