Udpcast May 2008

udpcast@udpcast.linux.lu

8 participants
11 discussions

throttle output of udp-cast
by David Crider 23 Sep '08

23 Sep '08

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.

2 1

Sender's timeout for waiting for receivers
by Dmitry Popov 23 Sep '08

23 Sep '08

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

2 1

Request - include netcat
by brian＠polibyte.com 23 Sep '08

23 Sep '08

Hi, It would be nice if netcat were included in the CD and PXE images. Busybox has a version, so adding it shouldn't take much. All the best, Brian

2 1

incorrect documentation of --nosync flag?
by George Coulouris, MSD 11 Sep '08

11 Sep '08

http://udpcast.linux.lu/cmd.html states that --nosync is the default when writing to a file or a pipe, but this does not appear to be the case; I verified with strace that udp-receiver open()s its output file with O_SYNC unless you specify --nosync.

2 1

incorrect documentation of --nosync flag?
by George Coulouris, MSD 30 May '08

30 May '08

1 0

Question
by m.forster 29 May '08

29 May '08

Hello, i would like to run udpcast on a computer which has 2 NICs. udpcast is using eth0, but i have to integrate eth1 as the used device. (i can do this with the additional command line parameter -interface eth1) but the interface eth1 don't come up automatically, i must invoke a ifconfig eth1 up before udpcast. But i can only assign a static ipadress to eth1 with ifconfig, the dhcp option doesn't work. Has anyone a idea how i can bring up eth1 on this small console with DHCP? regards, Markus Forster

2 1

Pendrive
by Leandro Boldrini 21 May '08

21 May '08

Hi, Can I use udpcast on my pen drive? If yes, How? -- Leandro Boldrini Acosta _______________________________________________ Udpcast mailing list Udpcast(a)udpcast.linux.lu https://lll.lgl.lu/mailman/listinfo/udpcast

1 0

udpcast for macbook platform?
by D G Teed 08 May '08

08 May '08

I've only spent a few minutes researching this, but it seems Apple use a semi-proprietary netboot for their network boot option (hold down N key). It is well supported by Apple's NetBoot and NetInstall services on the Mac OS server. I've seen a couple of howtos on making Linux with netatalk and patched dhcp do the full netboot trick. Has there been anyone able to boot the macbook client from Linux server for purposes of using udpcast? --Donald Teed

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Re: [Udpcast] [solved] Problem with cloned MACs
by Pitt Leidner 08 May '08

08 May '08

hi, Am Donnerstag, 8. Mai 2008 schrieb D G Teed: > Hi, > > I'm glad you shared the result of that perplexing problem > on the Mac. > Upps, I was talking about the *MAC-Address of a NIC* (MAC = Media Access Controll, NIC = Network Interface Card), not about the *MAC-PC*! I know the MAC PC just from stores, never worked with it, sorry. > We are just starting out with the Applebook > and my first challenge is to see how to make the Mac client > use PXE boot. I've googled and I don't see any boot > key option for selecting PXE boot on the Mac client. > I would look the BIOS for something like: LAN-Boot [enabled] > The sales rep from Apple said it would work - I'm puzzled. >[...] > -- yours sincerely Pitt

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Trouble with connection
by m.forster 05 May '08

05 May '08

Hi all, we have some trouble with establishing a connection over different VLANs. The server (sender) is located in one VLAN (10.199.248.0/24) and the clients (receiver) are located in 10.120.150.0/24. Between the VLANs work 2 routers (Cisco equipement, Switches are Cisco, too), but i can't see a connection when i start the sender. We use an PXE image to boot-up, the server is running under Ubuntu 6.06. Multicasting between the VLANs is enabled. I think this is a problem with broadcasting. Does anyone know what we have to do? I tried already the ttl option, connection was found but the transfer did not start. I get directly a timeout and he can't transfer anything. Thanks in advance for an quick answer! regards, Markus Forster

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Udpcast May 2008