September 2009 - Udpcast

castomize udpcast iso image
by Gianluigi Autuori 17 Jul '11

17 Jul '11

I want to use Udpcast from iso image in this scenario: - first pc boots from udpcast iso image -second pc boots from ethernet using pxe that sends him udpreceiver How can I do it? thanks

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Udpcast for streaming data.
by Jorge Muñoz Castañer 31 Dec '09

31 Dec '09

Hi list, I was looking for a tool to send a stream of data with FEC where the client/receiver can connect even if the stream has yet begun. I haven't found anything but Udpcast that can do anything similar. I think that maybe an "streaming" option can be added so the sender sends Hello packets at the end of a block of slices+FEC so a receiver can hook to the UDP stream. What do you think about this? Can this be made modifying Udpcast without broken it all? Is there another software that I can use? Greetings, Jorge M -- --------------------------------------- Jorge Muñoz Castañer e-mail: jorgem(en)det.uvigo.es Grupo de Tecnologías de la Información Departamento de Ingeniería Telemática Universidad de Vigo ETSI Telecomunicación Campus 36310 Vigo SPAIN ----------------------------------------

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Network card Error
by Darin MacLachlan 30 Dec '09

30 Dec '09

This was working and now it has stopped. Have a UDPcast server running on a HP DL360G5 with 4 NICS. One connected to an internal infrastructure (eth2) and another connected to a dedicated switch with the client systems on the same switch (eth3). When i run the UDPcast send or receive, using the following command: udp-sender -f /home/base.udpc --interface eth3 --point-to-point --full- duplex --max-bitrate 600m --nokbd --portbase=9922 --min-receivers 1 -- rexmit-hello-interval 5000 --max-wait 300 I get the following error message: Udp-sender 2007-03-23 No suitable network interface found The following interfaces are available: lo 127.0.0.1 eth2 10.46.0.251 eth2:1 10.46.0.1 Interestingly, an ifconfig show eth3 as a valid network adapter, but the udp-sender does not see the device. This was working last week, and nothing has changed on the server I have tried everything, restarting DHCP, removing the interface and adding again. Rebooted the server, restarted the network stack manually. nothing seems to help. Using SUSE linux 10 as the base server OS.

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unicast with async
by Justin Lipman 29 Dec '09

29 Dec '09

Hi folks, I'd like to use udp-sender with async and a unicast address instead of multicast so that unicast at the MAC layer is actually used. Ive tried using the pointopoint switch, but I get the message "pointopoint mode set, and 0 participants instead of 1". Is there a way to do this with udpcast? Thanks kindly. J

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SATA driver
by Bert Van Vreckem 30 Nov '09

30 Nov '09

Hello, I'm trying to build a UDPCast image for a classroom of Dell Optiplex 760 machines. This machine has SATA drives that need the ata_generic and pata_acpi kernel modules. These don't appear in the menu, but apparently the actual modules are included in the standard ISO image. How can I get the correct modules loaded? Cheers, bert

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UDP Cast ready-made boot images and i686 issues
by Henrique Rodrigues 03 Nov '09

03 Nov '09

Hello, I've been using UDP Cast extensively for a while now and I love it, but I had an issue last week and I want to share it witou you. The UDP Cast website provides handy ready-made boot images. Apparently, those images are compiled for i686 and I couldn't make them work on an older machine because the processor doesn't implement the CMOV operation. The problem seem to belong to GCC, because it thinks that every i686 processor implements the optional CMOV operation, which is not true. I solved the problem by compiling my own UDP Cast kernel, but I suggest that the next UDP Cast ready-made boot images drop the i686 requirement and stick to i386, for compatibility reasons. Is this a reasonable request? Thank you and best regards, Henrique Rodrigues -- Henrique Rodrigues http://sodki.org Engenharia Informatica e de Computadores - Instituto Superior Tecnico

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Creating files within dhcp.script
by Jens Breuer 03 Nov '09

03 Nov '09

Hello List, hello Alain, I am playing around with the "udpcast image generator" and I need to store the next-server address in the filesystem for later processing. I am using kernel-udpcast_2.6.30-rc5_all.deb and udpcast-mkimage_20081213_all.deb. This is what my dhcp.script looks like: === snip === #!/bin/sh [ -n "$broadcast" ] && BROADCAST="broadcast $broadcast" [ -n "$subnet" ] && NETMASK="netmask $subnet" case "$1" in deconfig) /sbin/ifconfig $interface 0.0.0.0 ;; renew|bound) /sbin/ifconfig $interface $ip $BROADCAST $NETMASK /sbin/echo $siaddr > /etc/server.ip ;; esac === snap === This works as expected when generating cd-images. If I generate a initrd and boot via PXE, the file /etc/server.ip never gets created. I tried to create the file in many places (/tmp, /sbin, etc.) but it doesn't work. Is there something important that I am missing? I thought that there is no difference between a cd-image and a plain initrd (besides syslinux/pxelinux and the kernel being separate). Additionally FYI, when using the latest kernel and mkimage I get some weird behaviour. I use VirtualBox 2.2 for testing purposes and both cd-image and initrd crash the VM when trying to write to the filesystem from within dhcp.script. Any help/suggestion is much appreciated. Thanks in advance. Regards Jens

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performance problem
by motchane＠iut-orsay.fr 10 Oct '09

10 Oct '09

Hello, I have a performance problem with udpcast : - when I send data from one machine s to 2 machines r1 and r2 (all are connected with the same switch, all 1000M network card) with : udp-sender --full-duplex --min-clients 2 --max-wait 300 --interface eth0 --mcast-all-addr 224.0.0.1 --portbase 2232 --ttl --file /home/test udp-receiver --mcast-all-addr 224.0.0.1 --portbase 2232 --ttl 1 > /dev/null I have a bit rate of 9.47 Mbps. -when I send data from s to either r1 or r2 with the same commands, I obtain 945.55 Mbps ! I use the last version of udpcast (udpcast-20090920) and Debian Lenny. Do you have any idea of why and how to solve this ? Regards,

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Experiencing reproducible corruption when using udpcast-20090912
by John Eisenman 21 Sep '09

21 Sep '09

I'm new to udpcast and so may be doing something wrong. However, I find that with the latest two versions (udpcast-20090912 or udpcast-20090830), I experience repeated file corruption. I've had better, but not perfect, success with an old version (udpcast-20071228). In order to test, I made an ordered file, 500MB in size: cl6 tmp # ls -l test-52428800.dat -rw-r--r-- 1 jice jice 524288000 Sep 15 17:52 test-52428800.dat cl6 tmp # head -14 test-52428800.dat 000000000 000000001 000000002 000000003 000000004 000000005 000000006 000000007 000000008 000000009 000000010 000000011 000000012 000000013 I find that every time I send and receive a file, it is the correct length. However, certain data is missing and other data is repeated. Here is an example of my command line to send the data: udp-sender --log udpcast.log --bw-period 1 --nokbd --min-receivers 1 --min-wait 5 --portbase 9010 -f test-52428800.dat --pointopoint Here is my command line to receive data: udp-receiver -f test2 --nokbd --portbase 9010 I have test result files that I can provide if they would be helpful. I am running under Gentoo on AMD64 processors. I've tried under two different kernels: # uname -a Linux cl7 2.6.20-gentoo-r8 #1 SMP PREEMPT Wed Aug 22 14:28:25 PDT 2007 x86_64 AMD Opteron(tm) Processor 246 AuthenticAMD GNU/Linux # uname -a Linux m231 2.6.30-gentoo-r4pb #2 SMP Thu Aug 27 18:41:51 PDT 2009 x86_64 Quad-Core AMD Opteron(tm) Processor 2374 HE AuthenticAMD GNU/Linux

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Udpcast 20090830 and gzip'ed data
by David Gnedt 12 Sep '09

12 Sep '09

Hi, First I want to thank you for that great piece of software. I am using Udpcast in the opensource cloning solution OpenClone (http://openclone.nongnu.org/) When testing the new Udpcast version 20090830, I discovered a bug. If I try to transmit gzip'ed data with this version, the receiver breaks the transfer after a very short period of time (usually less than a second). For example: $ udp-receiver -f /dev/null Udp-receiver 2009-08-30 UDP receiver for /dev/null at 10.10.10.254 on eth1:0 received message, cap=00000009 Connected as #0 to 10.10.10.194 Listening to multicast on 234.10.10.194 Press any key to start receiving data! bytes= 98 304 ( 6.17 Mbps) Bad base 98304, not multiple of block size 1456 Transfer complete. $ gzip < /dev/urandom | udp-sender Udp-sender 2009-08-30 Using full duplex mode Using mcast address 234.10.10.194 UDP sender for (stdin) at 10.10.10.194 on eth0 Broadcasting control to 10.10.10.255 New connection from 10.10.10.254 (#0) 00000009 Ready. Press any key to start sending data. Starting transfer: 00000009 Disconnecting #0 (10.10.10.254) bytes= 98 304 re-xmits=0000000 ( 0.0%) slice=0112 - 0 Transfer complete. Udpcast version 20081213 hadn't any problems with gzip'ed data. David Gnedt

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