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?
Jorge Muñoz Castañer
Grupo de Tecnologías de la Información
Departamento de Ingeniería Telemática
Universidad de Vigo
Campus 36310 Vigo SPAIN
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:
No suitable network interface found
The following interfaces are available:
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.
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?
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?
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,
Engenharia Informatica e de Computadores - Instituto Superior Tecnico
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
This is what my dhcp.script looks like:
=== snip ===
[ -n "$broadcast" ] && BROADCAST="broadcast $broadcast"
[ -n "$subnet" ] && NETMASK="netmask $subnet"
case "$1" in
/sbin/ifconfig $interface 0.0.0.0
/sbin/ifconfig $interface $ip $BROADCAST $NETMASK
/sbin/echo $siaddr > /etc/server.ip
=== snap ===
This works as expected when generating cd-images.
If I generate a initrd and boot via PXE, the file /etc/server.ip never
I tried to create the file in many places (/tmp, /sbin, etc.) but it
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
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
Any help/suggestion is much appreciated.
Thanks in advance.
I am having quite a lot of success with udp-cast, it is proving to be
very useful in shifting large hard disk images across the network.
If there is a chance of new features, one I would like to see is the
ability to set a time-out if no receivers connect to the sender in a
given amount of time.
I am using it for imaging notebooks and once I have done a set, I move
on to a different image. It would be nice if it would quit after a day
of being idle.
You might be interested in this...
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I have an embedded system with this controller: AMD Geode CS5536A, so I
have selected pata_cs5536: low-level driver for the CS5536 IDE
controller, but after boot I can't see any disk and I see this error:
"pata_cs5536: disabled by BIOS"
Can you help me?
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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 126.96.36.199 --portbase 2232 --ttl --file /home/test
udp-receiver --mcast-all-addr 188.8.131.52 --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 ?