Udpcast

udpcast@udpcast.linux.lu

556 discussions

A question about how udpcast works.
by Jeff Hali 11 Jun '15

11 Jun '15

Hello to the great team behind udpcast (hope this mail reaches you) I have a question about an odd thing that I have seen while using udpcast. As you can see there are 1544 and 96 length frames mixed together , I suspect that this may cause some errors on my setup. Could you tell me if these mixed lengths are a result of how udpcast works? What exactly is happening here? because this is unexpected for me. mac #5: frame-len=1538 (nzld=0), subframe-len=1544 mac #6: frame-len=1538 (nzld=0), subframe-len=1544 mac #7: frame-len=1538 (nzld=0), subframe-len=1544 mac #8: frame-len=90 (nzld=0), subframe-len=96 mac #9: frame-len=90 (nzld=32), subframe-len=96 mac #10: frame-len=90 (nzld=32), subframe-len=96 ^ sample , this pattern of interwoven lengths 1544/96 repeats itself in the transmission. Thanks and best regards. Jeff.

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udp-receiver --start-timeout exits with 0 even if timed out
by Erik Jacobson 01 Dec '14

01 Dec '14

We use udpcast in an environment somewhat based on systemimager but highly modified. We have run in to a very sad situation where a particular model of switch decides it doesn't want to pass the multicast data packets and none of them get through. It is an extremely hard problem to duplicate because it seems to work 99% of the time. The end result when we hit the problem is the udp-receiver "waits forever". So I've begun to consider setting some additional timeouts in the system to try to work around this switch problem. I investigated receive-timeout and start-timeout. Since I'm never able to reproduce the problem "on demand", I emulated the problem by using iptables to block the data stream packets. I found that receive-timeout isn't in play in a situation where not one data channel packet has been sent. However, start-timeout is in play. There seem to be a couple select()-like situations that use the start-timeout. Prior to the "Connected as" message in udp-receiver, if you hit start-timeout there, udp-receiver will exit with an exit code that can be captured by a script for a re-try. However, the selectWithConsole() call in dispatchMessage(), while returning a 0 on select timeout, the caller (netReceiverMain()) doesn't test the return value of the timed out transfer. It turns out selectWithConsole is where I hit the timeout for the "no multicast data packets transferred" problem. After digging further, I realized this is likely because there are threads involved and this makes it more complicated to handle status. I'm rusty with my C but I came up with a work around to get us going. I am not suggesting that this is a good solution, but it does solve it for me and could be used as an illustration of my problem. Maybe some of you experts can quickly come up with the correct solution. Basically, I exit with 100 if zero bytes were transferred. Then I can test that easily in our scripts and re-try if needed in some sort of loop. I realize the correct solution is to exit with an error code if the selectWithConsole() call in dispatchMessage() times out, but it looked hard to deal with when combined with my C-programming rust. Other suggestions welcome. Attached is my "patch" for illustration reasons and not a suggested "fix" for the problem. Erik

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64bit windows Version
by Frank Aust 30 Oct '14

30 Oct '14

Hallo guys, Exsist an 64bit windows Version from udpcast? Greetings Frank Aust EDV-Beratung agnw&sgnw Mettmann + Goldbach + Saulgrub Welfenweg 9, 82442 Saulgrub fon 08845 7578340, fax 08845 7578342 www.sgnw.de, mail(a)sgnw.de Sitz des Unternehmens: Saulgrub, Inhaber: Klaus Heitkötter, Steuernummer: 119/227/30387

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Missing Network Module
by Tobias Hues 29 Aug '14

29 Aug '14

Dear udpcast-Team I just wanted to make an Image with your custom udpcast configurator. As I Started our System with the boot cd the program couldn't find the right network Module. So I had to select the Right One manually. The Problem is that I Need Modules for Intel(R) Dual Band Wireless-AC 7260 Intel(R) ethernet Connection i218-lm Is there a Way to integrate Those Modules by myself or is it possible to add Those ? Mit freundlichen Grüßen/Kind regards Tobias Hues

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Re: [Udpcast] Patch that fix build on rhel-7 and fc-20 (fd_set problem)
by Michael D. Setzer II 16 Jul '14

16 Jul '14

I don't know about rhel-7-x86_64 but with both fc-20 32bit and 64 I get the following error after doing ./configure then make. In file included from console.c:7:0: console.h:25:9: error: unknown type name ‘fd_set’ fd_set *read_set, struct timeval *tv, ^ make: *** [console.o] Error 1 My fix was to console.h to add #include <sys/select.h> After adding that line, and rerunning make it compiles on both the 32bit and 64bit fedora 20 machines I have. Don't know if this patch is effecting the whole thing, or if this addition might cause problems building on other systems. Just found where fd_set was defined and added the include. On 16 Jul 2014 at 15:39, Alain Knaff wrote: Date sent: Wed, 16 Jul 2014 15:39:00 +0200 From: Alain Knaff <alain(a)knaff.lu> To: udpcast(a)udpcast.linux.lu Subject: Re: [Udpcast] Patch that fix build on rhel-7 and fc-20 (fd_set problem) > On 16/07/14 15:22, Olivier LAHAYE wrote: >> > >Hi, >> > > Here is a patch to udpcast that fixes the build problem on > > rhel-7-x86_64 and fc-20-x86_64. >> > > Please review the patch, merge it to the source-tree and provide a > > updated tarball. >> > > Thanks in advance. >> > >Olivier. >> > > Could you maybe first start with explaining what "the" build problems > on rhel-7 and fc-20 are? > >Thanks, > >Alain > >_______________________________________________ > Udpcast mailing list >Udpcast(a)udpcast.linux.lu >https://www.udpcast.linux.lu/cgi-bin/mailman/listinfo/udpcast +----------------------------------------------------------+ Michael D. Setzer II - Computer Science Instructor Guam Community College Computer Center mailto:mikes@kuentos.guam.net mailto:msetzerii@gmail.com http://www.guam.net/home/mikes Guam - Where America's Day Begins G4L Disk Imaging Project maintainer http://sourceforge.net/projects/g4l/ +----------------------------------------------------------+ http://setiathome.berkeley.edu (Original) Number of Seti Units Returned: 19,471 Processing time: 32 years, 290 days, 12 hours, 58 minutes (Total Hours: 287,489) BOINC@HOME CREDITS ROSETTA 17621215.996525 | SETI 29126476.308997 ABC 16613838.513356 | EINSTEIN 28060690.358937

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Patch that fix build on rhel-7 and fc-20 (fd_set problem)
by Olivier LAHAYE 16 Jul '14

16 Jul '14

Hi, Here is a patch to udpcast that fixes the build problem on rhel-7-x86_64 and fc-20-x86_64. Please review the patch, merge it to the source-tree and provide a updated tarball. Thanks in advance. Olivier. -- Olivier Lahaye DRT/LIST/DIR

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Dissector
by Brent Kimberley 27 Jun '14

27 Jun '14

Greetings. Has anyone written a dissector for UDPCast or considered adding Low Density Parity Check Codes? Best Regards, Brent THIS MESSAGE IS FOR THE USE OF THE INTENDED RECIPIENT(S) ONLY AND MAY CONTAIN INFORMATION THAT IS PRIVILEGED, PROPRIETARY, CONFIDENTIAL, AND/OR EXEMPT FROM DISCLOSURE UNDER ANY RELEVANT PRIVACY LEGISLATION. No rights to any privilege have been waived. If you are not the intended recipient, you are hereby notified that any review, retransmission, dissemination, distribution, copying, conversion to hard copy, taking of action in reliance on or other use of this communication is strictly prohibited. If you are not the intended recipient and have received this message in error, please notify me by return e-mail and delete or destroy all copies of this message.

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Using Udp Cast over Vpn?
by calibu taranjik 24 Jan '14

24 Jan '14

Hi First of of thanks to developers for this great tool. I am trying to use it over vpn connection but I cannot get the server and the client to see eachother. I define the interface in the commandline as tun0 but that is not doing the job. My Vpn has 10.30.0. range. thanks

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Issue building on Fedora 20?
by Michael D. Setzer II 13 Jan '14

13 Jan '14

Just setup some new machines with Fedora 20, and was going thru the process of building the udpcast, and got an error message that fd_set was not defined in console.h. Did a check and this is defined in sys/select.h and that is listed in the socklib.h, so not sure what the issue is?? I added the include of sys/select.h in console.h, and then the make went thru with no problem. +----------------------------------------------------------+ Michael D. Setzer II - Computer Science Instructor Guam Community College Computer Center mailto:mikes@kuentos.guam.net mailto:msetzerii@gmail.com http://www.guam.net/home/mikes Guam - Where America's Day Begins G4L Disk Imaging Project maintainer http://sourceforge.net/projects/g4l/ +----------------------------------------------------------+ http://setiathome.berkeley.edu (Original) Number of Seti Units Returned: 19,471 Processing time: 32 years, 290 days, 12 hours, 58 minutes (Total Hours: 287,489) BOINC@HOME CREDITS ROSETTA 9894257.174270 | SETI 17280158.156095 ABC 16613838.513356 | EINSTEIN 15060552.839852

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updcast packet capture issue
by Chris Healy 06 Oct '13

06 Oct '13

Alain, I'm trying to perform a packet capture of the data transmitted by udp-sender using Wireshark and am running into the exact same problem encountered by Lance 8 years ago. (posting listed below.) What information can I provide to help debug this issue? Also, can you tell me if the multicast data sent includes a sequence number and does the receiver have the ability to filter out duplicate multicast frames? Regards, Chris On Mon 8/15/2005 10:25 AM, Alain Knaff wrote: >*Try upgrading to a newer version of ethereal.*>**>*I just tried it here: version 0.10.9 has the problem, but 0.10.12*>*works fine.*>**>*Or use tcpdump...* I have used the lattest version of udpcast (udpcast-20050226.tar.gz) as well as used ethereal version 0.10.12 and I still get the "Bogus IP header length (0, must be at least 20)" I will continue to try this on different Platforms with different network switches and see what I get. -Lance

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