Re: [Udpcast] multi computer cast problem - Udpcast

24 Sep 2008

Both server (debian etch) and client (knoppix 5.1 with downloaded and
compiled new version of udpcast) don't have firewalls. Maybe it is
something with kernel version (on both server and client)? I will try
udpcast boot cd...

Michael D. Setzer II pisze:
...
  Just a follow up to the other reply you have already
gotten. If you have a firewall running on 
 the client and servers, you need to open both the 9006 port and the 9007 ports. Not sure
if 
 this would effect you. I was sending a file to many machine, and it also worked with one

 client, but more, it didn't work. I think the transfer is done on the main port, but
the clients talk 
 back to the sender machine via the next port. I also had the same switch problem, but
using 
 udpcast boot cds don't have the firewall, but the Fedora systems do. 

 On 23 Sep 2008 at 22:05, Paweł Ufnalewski // BSS wrote:

 Date sent:      	Tue, 23 Sep 2008 22:05:25 +0200
 From:           	Pawe³ Ufnalewski // BSS &lt;archon(a)pjwstk.edu.pl&gt;
 To:             	udpcast(a)udpcast.linux.lu
 Subject:        	[Udpcast] multi computer cast problem

  Hello,

     I've got problem with multicasting to many computers at once. I've
 got server with newest udp-sender (20071228) which is sending files from
 ext3 partition (with command  ./udp-sender --pipe 'tar -B -S -cpf - -C
 /usr/share/systemimager/boot/i386/pjwstklenny .' --portbase 9006
 --min-clients 2 --min-wait 15 --interface eth1 --max-bitrate 70M
 --mcast-all-addr 234.1.1.162 --ttl 10

 and I'm trying to receive it with command:

 ./udp-receiver --portbase 9006 --nosync --ttl 10 --mcast-rdv-address
 234.1.1.162 --pipe "tar -f - -x -vv -C /disk"

 on client computer.

 Problem is that, when I'm doing it one-by-one (I mean server-1 client) I
 get full speed - ~70MB/s, but when I'm trying to to this with >= 2
 computers transfer drops to >0,5Mb/s. Why? I tried diffrent and the same
 subnet, I'm using 3com & cisco 3-layer switches (I also tried putting
 server and clients on the same switch - the same effect).

 Please help, cause I've got >200 computers to clone ;)

 Best regards

 Paul Ufnalewski // BSS
 Polish Japanese Institute of Information Technology

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