Is it possible to do dynamically throttled UPDcast transmission? We need
to throttle the data flow to a Logic Innovations IP encapsulator (with
LI's documentation attached with their permission).
The udpcast mutlticast address is considered a single route to the IPE.
The IPE sends out flow-control messages (described in document) that
shows how many bytes are available for traffic for each route every 100
milliseconds in a multicastand comes from a user specified multicast of
its own. Attached is the LI document, again with the manufactures
permission. Also, you can contact Theo Aukerman, taukerman(a)logici.com
for any additional info.
I'm asking these questions because IF this is possible, then this would
be an almost complete framework for an open source Data-casting network,
and can be used for over the air data-broadcasting from any DTV
transmitter or any other system with null packets. I currently work as
an engineer for a TV station that does data transmission, but would like
to move to an open source model.
Hi everyone,
Please confirm my guess (or explain how to implement it).
I need a "sender-timeout", a period of time while sender waits for receivers
to connect, and if none are connected - sender exits without transmission.
The only way to implement this is shell/perl/... script, which starts
udp-sender with --min-receivers option and monitors its stderr. If no
"Starting transfer" is found during specified period of time - it kills
udp-sender process.
Regards,
Dmitry
I just put in a Fedora Review Request for udpcast, which is the first
step towards getting udpcast included as a standard package in Fedora.
If udpcast users could review and test this package and post their
experiences (good or bad) to this bug it would be helpful:
https://bugzilla.redhat.com/show_bug.cgi?id=443449
Rich.
--
Richard Jones, Emerging Technologies, Red Hat http://et.redhat.com/~rjones
virt-p2v converts physical machines to virtual machines. Boot with a
live CD or over the network (PXE) and turn machines into Xen guests.
http://et.redhat.com/~rjones/virt-p2v
I'm looking at using udpcast to broadcast large disk images (10+ GB)
to a very large network of machines (1,000-10,000 receivers) over a
mostly switched, partially segmented gig-ethernet network.
Needless to say, the network of machines is all production-critical
and I cannot get access to perform real testing. However testing it
on my home network I can see some potential problems:
- If _any_ receiver is misbehaving or unreachable then this stops
all transmissions. Is there a way to get udpcast to drop
troublesome receivers in this situation (other than unicast)?
- Has anyone used the --ttl option to multicast over routers?
Does it work (the manpage is unclear)? Does it need special
routers?
- Any other scaling tips? Should I try to go for the full set of
machines at once or break up the broadcast into groups of machines?
If anyone has used udpcast on such large networks, can you share any
experiences.
Rich.
--
Richard Jones, Emerging Technologies, Red Hat http://et.redhat.com/~rjones
virt-top is 'top' for virtual machines. Tiny program with many
powerful monitoring features, net stats, disk stats, logging, etc.
http://et.redhat.com/~rjones/virt-top
Hi ML,
happy to found this tool, I've got my first big problem with it.
Using the multicast to clone a HDD to several Clients, the clients take
the MAC of the onboard NIC (NVidia nForce). After that, the original MAC
is gone and I'm not able to restore this.
This fact has been a little difficult to find. Cause I thought, the MAC
ist Part of the NIC, not of the HDD, which has been cloned. So how does
it come?
And even how can I overcome this?
Any Idea would be appreciated,
TIA
--
yours sincerely
Pitt
Michael D. Setzer II schrieb:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Just a quick question. When you did the build, were you logged in as root?
> Many of the special files only work with root. I've had some people make the
> mistake of building with an id other than root.
>
Thanks for your reply.
No this is not the problem. This was not the first kernel I built. ;-)
Kernel 2.6.23 works successful under the same preconditions. But as
already mentioned I had to back port the e1000e driver.
I will have a look at the ISO you mentioned. Could you send the .config
file for the 2.6.25 kernel?
>
> I've built many kernels on my g4l cd image, and include udp-sender and
> udp-reciever on the cd image, but have only setup the g4l to be use the
> reciever. You could see it those kernels would work. I haven't setup a PXE
> with g4l, but others have.
>
> Latest version with even the 2.6.25 kernel is available at:
> ftp://amd64gcc.dyndns.org/g4l-v0.25alpha10.iso
>
>
>
I need support for intel e1000e network adapters finally introduced with
kernel 2.6.24. So I compiled a 2.6.24.4 kernel for udpcast.
I created a initrd for PXE boot. Kernel and initrd are loaded and the
computers start to boot but they always hang after a while throwing the
message
init: can't open "/dev/null": no such file or directory
The problem also occurs on my VMware testing machine.
I used the 2.6.23.12 kernel configuration from the udpcast homepage with
the suggested changes for the new parts of the kernel.
My current workarround is a back-port of e1000e support from 2.6.24.4 to
2.6.23.12. But I would prefer to use kernel 2.4.24
Is there anybody out there with a running 2.6.24 based udpcast?
Best regards
Matthias
If I access a virtual console on the cast-o-matic PXE images
I've generated, --rcvbuf is listed as a commandline option
for udp-sender. The manpage for udp-sender suggests setting,
"Try playing with the settings in /proc/sys/net/core/rmem_default
and /proc/sys/net/core/rmem_max, i.e. setting them to a higher
value"
Does udp-receiver's "--rcvbuf" option modify rmem_default and/or
rmem_max or some other value?
-Tom C.
Hello,
I would like to include ntfsresize into an initrd created by cast-o-matic. I compiled ntfsresize statically and uploaded the application to be included in the initrd. I'm pretty sure this is a busybox issue. ntfsresize appears in the initrd but I cannot execute it.
I am not very familiar with busybox so any help would be appreciated. Thank you in advance.
Jeff Michels
Technology Support Specialist
The School District of Beloit
