Udpcast August 2009

udpcast@udpcast.linux.lu

8 participants
16 discussions

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

3 2

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 ----------------------------------------

2 6

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.

2 7

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

2 4

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

2 4

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

2 5

using async and pointopoint options together
by Selçuk Cevher 02 Sep '09

02 Sep '09

Hi All, Does udpcast currently allow using async and pointopoint options together ? That is, I want to specify the unicast address of the participant manually from the command line. I noticed that the same question was raised in last January, 2009, and the answer was "not -yet- supported": http://udpcast.linux.lu/pipermail/udpcast/2009-January/000956.html Thanks.

2 7

cast-o-matic
by Tom Carpenter 01 Sep '09

01 Sep '09

There's no option to choose the forcedeth module on the current cast-o-matic web site; is that intentional? I did find it in the .deb package containting the 2.6.30 pre-compiled kernel and modules. -Tom C.

2 1

how to by-pass HELLO message mechanism through -m option ?
by Selçuk Cevher 01 Sep '09

01 Sep '09

Hi All, I want to use udpcast in unicast (or pointopoint) mode. However, I do not want udp-sender to determine whether to use unicast or multicast based on the number of connections coming from the clients since I want to test udp-sender along with another application on the receiving side other than udp-receiver (In this framework, there won't be any connections coming from the clients). Based on above, I want udp-sender to use the unicast destination IP address provided by the user from the command line or it may be even hard-coded into the source code. I tried to use -m option to specify a unicast address instead of a multicast address to "trick" udpcast. But, it did not like that. I guess that it got some kind of negative feedback from the existing udp-receiver clients, and aborted the transfer since the clients were expecting a "proper" multicast address after -m option. Any ideas to overcome this issue ? Thanks.

2 1

multicast address to listen on
by Selçuk Cevher 31 Aug '09

31 Aug '09

Hi, Does udp-sender include the Ethernet multicast address for the receiver to listen on in HELLO messages ? There seems not to be any other mechanism to pass this information around (?) Thanks.

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Udpcast August 2009