October 2005 - Udpcast

UDPCast source code issues...
by Saikrishna Dasari 25 Apr '06

25 Apr '06

Hi Alain, I was studying the UDPCast source code for some experimental purposes. I have the following question. 1. The whole data to be transfered into is divided into slices which again contains a series of blocks to transfer. Can we consider the whole data to be transfered as a single slice ( By setting appropriate parameters in code) and what kind of performance issues we can expect if we do a change of this kind at code level. Thanks in advance, Sai --------------------------------- Do you Yahoo!? Y! Messenger - Communicate in real time. Download now.

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Buggy tg3 ethernet
by Donald Teed 04 Apr '06

04 Apr '06

The option of ipappend 1 in the default file and retransmission of HELLOs in udp-sender (--rexmit-hello-interval) has been valuable to getting udpcast working with the Dell notebooks we have with Broadcom 5700 series ethernet. Today, with a slightly newer broadcom chipset appearing in the most recent shipment, we noticed that udp-receiver was intermittantly not showing the "hit any button to start transfer" message. With some trial and error I found that if I watched the tail of /var/log/message on the receiver (server) and waited for the messages on TX and RX flow control to complete before running udp-receiver, it would always initiate a good connection. If I had started the udp-receiver prior to the TX/RX flow control appearing in the message log (in which case there was no "hit any key" message), I could ^C the receiver, run it again and it would signify the ready state with 100% success. In conclusion, we have a workaround of starting udp-receiver after a few seconds past the client PXE machine booting and showing the udp-sender status ready (but not yet "hit any key..."). Another solution would be if udp-receiver also supported --rexmit-hello-interval. It isn't a flaw in the udpcast system but a kludge for a network device that is proving itself to be sluggish in initialization in general. --Donald Teed

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Default boot not recognizing kb
by abarkley＠jamadots.com 04 Apr '06

04 Apr '06

I downloaded your CD image and it worked fine until I used it on a pc with a USB keyboard. These PCs are in the lab I am trying the program on. Do I need to compile my own image using my own kernal? I am using debian 3.1 and cannot find the required files as specified by the -k switch. Please, let me know what I need to do. Thanks, AJ

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Re: [Udpcast] UDPCast on OSX
by Jeff Michels 05 Dec '05

05 Dec '05

Hello Donald, Thank you for your reply. Here is the output I get: cc -Wall -Wshadow -DBB_FEATURE_UDPCAST_FEC -D_FILE_OFFSET_BITS=64 -DUSE_SYSLOG -DNO_BB -c -o socklib.o socklib.c socklib.c: In function 'udpc_getSendBuf': socklib.c:280: warning: pointer targets in passing argument 5 of 'getsockopt' differ in signedness socklib.c: In function 'udpc_getRcvBuf': socklib.c:293: warning: pointer targets in passing argument 5 of 'getsockopt' differ in signedness socklib.c: In function 'udpc_setTtl': socklib.c:323: error: 'SOL_IP' undeclared (first use in this function) socklib.c:323: error: (Each undeclared identifier is reported only once socklib.c:323: error: for each function it appears in.) socklib.c: In function 'mcastOp': socklib.c:368: error: 'SOL_IP' undeclared (first use in this function) make: *** [socklib.o] Error 1 Thank you for your help, Jeffrey Michels >>> D Teed <dteed(a)artistic.ca> 09/14/05 9:18 PM >>> I suggest posting the actual error you got when you tried to make the udpcast binaries. It could be an ordinary dependancy or lib you don't have. Usually the last 6 to 10 lines from a make error tell the tale of what went wrong. I've built udpcast on Sun with Linux, so I don't think there is anything x86 centric about it. --Donald Teed On Wed, 14 Sep 2005, Jeff Michels wrote: > Hello, > > I've been using UDPCast for about a year now and it has saved our school > district from the cost of a commercial imaging program. I has also > saved me many hours. For that I am grateful. > > Our district just purchased two Apple Servers. Currently I am using a > 500 Mhz PIII box running Debian as our main image server. It has been > extermely reliable and UDPCast works great however disk I / O and > processing limitations are showing. > > I would like to compile UDPCast for OSX. I have a Powerbook with 10.4 > and the 2.1 Developer tools installed. I have tried to compile but was > unsucessful. I have very limited coding skills so here is the > information I need: > > 1. What do I need to do to get UDPCast to compile on OSX. If a total > rewrite is needed, I will to lobby for a new(er) x86 box. > > 2. If anyone has done this I would like to read your experience. > > Thank you in advance for your help. > > Regards, > > Jeff Michels > School District of Beloit > Technology Support Specialist > _______________________________________________ > Udpcast mailing list > Udpcast(a)udpcast.linux.lu > https://lll.lgl.lu/mailman/listinfo/udpcast >

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How to do an automatic reboot
by david aimé 05 Dec '05

05 Dec '05

Hello I use udpcast with several computers. After duplicating one hard disk to the others, i would like that the computers that received the data reboot automatically. But i don't know how to do this because udpcast don't allow us to do that with it's options. I'm waiting for your advice Aimé David _________________________________________________________________ MSN Messenger : personnalisez votre messagerie instantanée ! http://g.msn.fr/FR1001/866

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udpcast suddenly stops
by Michael Hierweck 31 Oct '05

31 Oct '05

Hello, I tried for three times to copy a 8GB Partition over a 100 MBit network using the prebuild cd images. The transfer always stopped after exactly 3,238,596,608 bytes and the following error message was shown: Input/output error-xmits=0000000 What's going on here? Thanks in advance, Michael -- Michael Hierweck EDV-Serviceteam Werthmann & Hierweck GbR http://www.edv-serviceteam.net

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SATA drivers for Foxconn ls 36 motherboard not available with udpcast...
by Cyrille MAECHLER 26 Oct '05

26 Oct '05

Dear UDPCAST users, We are using Udpcast for our deployment installation up to now. We have bought some DELL GX620 which contains a motherboard named FOXCONN LS 36 and only one sata drive. We tried to make an image of this computer with Udpcast but the SATA drivers needed for it are not available. We don't have any other PC with sata controller. Do you know this problem ? Can you help us ? Thanks a lot for all suggestions... Best regards, European School Luxembourg IT managers 23, Boulevard Konrad Adenauer L-1115 Luxembourg Tel 432082-408 Fax 432082-344

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simple working example?
by Alan McKay 04 Oct '05

04 Oct '05

Hi folks, Can someone give me a simple working example of what's required on 2 linux boxes and the network switch in order to send files. 1 box is the sender and the other the receiver. I've never done anything with multicast before. I'm trying this in a sandbox. I've got a Symbol ES 3000 PWR switch and have IGMP snooping turned on. Both linux boxen connected to the switch. I've been reading the help on the website but still cannot seem to send a file. THe basic operation does not work : ./udp-sender --file udp-sender Udp-sender 2005-02-26 Using mcast address 49.152.135.239 UDP sender for udp-sender at 49.152.135.47 on eth0 Broadcasting control to 255.152.135.47 [waits here til I hit enter, then] Starting transfer: 00000019 Transfer complete. But on the other end udp-reciever is still just waiting : udp-receiver --file udp-sender Udp-receiver 2005-02-26 UDP receiver for udp-sender at 50.152.135.47 on eth1 Nothing. When hit enter, still nothing. When I ctrl-C the udp-sender file is there but size zero. Oh, I'm just trying to get it to send itself as an example I also try lots of the different tuning options including --nokbd, --broadcast and more, and still cannot get anything to transfer. Any idea what I'm doing wrong? thanks, -Alan -- http://www.bodensatz.com/ The Beer Site

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