10 Jan
2007
10 Jan
'07
7:14 p.m.
Hi Jonathan,
One of my favorite tools for debugging network problems is wireshark (used
to be ethereal) http://www.wireshark.org/
Having one or more passive listening computers running wireshark could point
you to potential problems.
Regards,
Todd
On 1/10/07, Jon Miller <jmiller7(a)gmail.com> wrote:
Donald,
Thanks for the suggestion, but these are actually desktop machines and
don't have a wireless card. I'm starting to think the problem might be with
the switch, but I'm not sure how to test it.
Thanks,
Jonathan
On 1/10/07, D G Teed <dteed(a)artistic.ca> wrote:
We have D620s from Dell. I included the wireless support
module simply so we could grab the MAC from it for our
notebooks database (we run a wget in the busybox shell
against a web server CGI to send up this data before imaging).
In our case, the Linux kernel was crashing if the wireless
antenae was powered on (small switch on side of notebook),
so we made sure that switch was off prior to booting
the clients.
--Donald Teed
On Wed, 10 Jan 2007, Jon Miller wrote:
_______________________________________________
Udpcast mailing list
Udpcast(a)udpcast.linux.lu
https://lll.lgl.lu/mailman/listinfo/udpcast
I decided to try this program on a lab of 25
GX620s with SATA drives
and
broadcom 57xx gigabit NICs. I'm not sure
why, but when I start a
group of
machines the transfer process goes along at a
fast pace
(~75Mb). However,
the process always seems to fail at different
places during the
transfer,
usually at about 800MB to 1.3GB of data.
Sometimes it will recover
and
start going again, but usually it just stops and
all the clients are
dropped. I used udp-sender.exe on a Windows machine to transfer a
GZIP'd
image created with G4U. I know the image is
good, because I routinely
use
it to unicast single PCs. On the target
machines, I used the
cast-o-matic
tool and selected all the SATA and NIC modules
with Automatic
detection.
The machines get an IP address and /dev/sda is
detected Also, I
verified
IGMP snooping is enabled on the switch.
I have tried limiting the --max-bitrate to 40M. I'm running in
100Mbit mode
--half-duplex (that's how the Summit 400
switch is setup). I've tried
using
the option on cast-o-matic to force IGMPv2 mode,
because I'm not sure
if our
switch could be the issue. I also tried the
udp-sender program from
Ubuntu
(was the version from the default repositories..
might be old). It
had the
same problem as the Win32 version. Although, the
console had a lot
more
errors than the windows version... I would get
streams of Timeout
notAnswered notReady, etc messages in the console when the process
would
halt. I've also tried setting the SATA mode
in the BIOS to
Combination.
Anyone encountered this problem before or have a suggestion? I'd
really
like to use this program, because it seems
perfect for my purposes
(imaging
labs).
Thanks for any help or advise,
Jonathan Miller