November 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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Re: [Udpcast] multicast sender error on Solaris "Invalid argument"]
by Ralf Lohmann 09 Nov '09

09 Nov '09

Hello, I solved the problem for me by deleting some Code around "Set multicast send interface" in socklib.c. Unfortunately I m not firm in C, so I could not make a Patch. Now I only have to discover, why after the successful transmission the udp-sender do not terminate. Therefore it is not possible using deamon Mode. Best Regards Ralf

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multicast sender error on Solaris "Invalid argument"
by Ralf Lohmann 07 Nov '09

07 Nov '09

Hello, I have a problem with the multicast mode of udp-sender. On Solaris 10 X86 and Solaris 10 Sparc it is the same error. One udp-receiver works perfect (unicast), but if I use two udp-receivers (I think then udp-sender switches to unicast mode) the sender gives the following error after starting the transfer with the anykey on the server: Udp-sender 2009-10-31 Set multicast send interface: Invalid argument and then the server stops. The Error is with udpcast-20091031 on Solaris 10 sparc and also on Solaris 10 x86! I compiled it with a hack, because the missing strndup in Solaris. I also have compiled udpcast-20070602 without a hack on Solaris 10 X86, because the news are saying it is Solaris 10 x86 ready. But I got the same error with the invalid argument. The same error occurs, when i set --ttl from 1 to 2. I think it is not a problem with the hardware or the network, because udpcast with the same hardware , but with Mandriva did work. It seems to be an Solaris related issue. Two Solaris-receivers with one Mandriva-sender did also work. Only the sender breaks on Solaris. Can you please help me? Best Regards Ralf

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udpcast accross routers
by Rodriguez Alban 03 Nov '09

03 Nov '09

- Tout le monde a l'air de poster en anglais alors je fais de même ... - Hi Alain, I was just wondering how can I setup udpcast in order for my udp- sender to communicate with its receivers on another vlan. I am aware on the TTL need to be greater than 1. The problem is more about establishing the session. It seems the receivers and the sender are finding each others broadcasting their HELLO command on the subnet; of course these don't pass through the gateway and receivers will never see their sender. I looked at the mcast-rdv-address command line switch but I don't known how to use it : should it point to the IGMP router address ? maybe I missed something. Thanks for you help Have a nice day Alban

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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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