[linux-dvb] Re: Howto setup a multicast network connection?

[Holger Kiehl <Holger.Kiehl@dwd.de>]

On Fri, 13 Jun 2003, Hugo Van Ruyskensvelde wrote:

> Hi,
> 
> To receive IP datagrams with your DVB card , go to the directory apps/dvbnet 
> in your DVB driver directory. Now change the file net_start.sh as follows
> 
> ./dvbnet -p 100 
> ./dvbnet -p 300
> 
> /sbin/ifconfig dvb0_0 192.168.238.238            
> /sbin/ifconfig dvb0_1 192.168.238.238
> /sbin/ifconfig dvb0_0 hw ether 01:02:03:04:05:06
> /sbin/ifconfig dvb0_1 hw ether 01:02:03:04:05:06
> 
> This way you receive the HRIT IP datagrams and the anouncement channels.
> You can see the raw data with a network 'sniffer' like ethereal.
>  
Thanks for the information, I will try this as soon as I have put in the
Technisat2 card, since it looks as if the KNC1 is not supported.

> The problem for linux lies in the fact that there is no closed or open source 
> application  for processing those multicast IP datagrams. The multicast 
> protocol used in EUMETCAST transmissions is MTP/SO .
> 
There is also a closed source application from Tellique, we are currently
testing it here.

> However the software from Tellique  (under windoze)  is working very well...

It is working better under windoze then under linux. But under both
we loose segments and under linux the losses are much higher. This is
why we want to test with different cards and different drivers to see
if this makes any different. What we notice with the pentamedia card
is that it has a high interrupt rate (approx. 500 ints/s). The other
hardware (CPU and harddisk) does not have any influence on the amount
of segments we loose. We tested this with some older hardware and
some very new one (i865 with Pentium 4 2.4 GHz and HT).

> I hope that in future there will be open source projects for receiving the 
> EUMETCAST transmissions.
> 
Yes, I hope so too. Since the high losses could also be caused by the
closed source application. If we had the sources it would be easier to
locate the problem.

Regards,
Holger



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