[linux-dvb] Problems with multicast and dvb card

["Paolo Casagranda" <pcasagranda@hotmail.com>]

Hi Holger,
I address the issue primarily to you, because you made multicast work at the 
end ;-)
The issue is: we install the linuxtv drivers (configurations tried: RH8 + 
linuxpre3 and RH9 + original Kernel 2.4.20 + linuxpre2; the card is a 
TT-DVB-T but the chipset is the same of a lot of other cards), we configure 
them with dvbnet, and tcpdump or ethereal can read the multicast packets 
CORRECTLY: they have correct IP and MAC addresses. But at application level 
we don't see anything; it seems that in promiscuous mode the driver works 
and with an application it doesn't.

We solved this problem, with the old drivers, deleting the 
dvb->set_multicast_list = dev_net_set_multi; and manually setting the MACs 
to 01:00:5e:n2:n3:n4 but I know this is a workaround.

Maybe with the new drivers there's some additional step we miss...

Thank you for any suggestion
Paolo



> From: Holger Kiehl <Holger.Kiehl@dwd.de>
> To: linux-dvb@linuxtv.org
> Subject: [linux-dvb] Re: Problems with mutiple multicast channels and 
> linuxtv
> Date: Tue, 1 Jul 2003 12:44:27 +0000 (GMT)
>
> On Thu, 26 Jun 2003, Holger Kiehl wrote:
>
> > Hello
> >
> > I am having problems receiving multiple multicast channels with the
> > linuxtv drivers. With the help of this list I managed to receive data
> > with the KNC1, Skystar2 and Nova DVB-s cards. With tcpdump and iptraf
> > I can see that data does arrive on all channels. I use closed source 
> software
> > from Tellique to receive the data and with strace I can see that they
> > use poll() to detect if data does arrive on any of the channel. With
> > the first channel this works without any problems. However if there is
> > data on the second or third channel poll() does not detect this.
> > I tested this with two separate pc's one with the pent@value that
> > comes with its own driver and the other with the Nova-s and linuxtv
> > driver and both had the exact same copy of the tellique software and
> > setup. Then started the tellique software on both machines with
> > strace and started iptraf to make sure data comes in. As soon as there
> > is data on for example the second channel the poll() with the pent@value
> > driver returns but the linuxtv driver poll() does nothing.
> >
> > Now I do not know if you do need to program the receiving software 
> differently
> > to receive all channels with linuxtv driver since ifconfig does setup
> > a device for each channel, while the pent@value only uses a single
> > device for all channels. If that is not the case then this looks like
> > a bug in the linuxtv driver.
> >
> > Please, what can I do to receive more then one multicast channel with
> > linuxtv?
> >
> The problem has been solved, it was necessary to give each interface
> a different IP address. My mistake was that I gave them all the same IP
> (blush, blush ...). So the linuxtv driver is working correctly.
>
> Comparing linuxtv and Nova card with the pent@value I can see that the
> interrupts caused is much lower with linuxtv, nearly half that of the
> pent@value. Good!
>
> But what has me worried is the high temperature of any of those cards,
> pent@value, nova, skytar2 or knc1. They are all quit hot. Makes me wonder
> if these cards are designed to operate 24 hours 7 days a week?
>
> One last question what is the meaning of the following messages in
> /var/log/messages:
>
>   Jul  1 12:33:58 dwdsat2 kernel: dvb0_0: filter mac=00 d0 5c 22 43 40
>
> I get them very frequently, how can I get rid of them?
>
> Thanks,
> Holger (Kiehl)
>
>
>
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