[linux-dvb] Re: Problems with multicast and dvb card

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

Hello Paolo

Sorry for the late reply.

On Thu, 3 Jul 2003, Paolo Casagranda wrote:

> 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.
> 
I just see that the devices where all in promiscuous mode, but I just
turned it off and we still receive data.

> 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...
> 
Here are the steps that I did to get it working:

   - cd linuxtv-dvb-1.0.0-pre3/driver
   - make and then a make insmod
   - szap -n 1 (I think you need something else here)
   - dvbnet -p <PID> for each PID you want to receive.
   - ifconfig dvb0_0 <IP0>
     ifconfif dvb0_0 hw ether <MAC>
     ifconfig dvb0_1 <IP1>
     ifconfif dvb0_1 hw ether <MAC>
     ifconfig dvb0_2 <IP2>
     ifconfif dvb0_2 hw ether <MAC>
        .
        .
        .
     (for each PID)
   - then started the application

Maybe try to start your application with strace and see why is not able
to receive anything. I also always use ifconfig to see if packets do
arrive:

[root@dwdsat3 linuxtv-dvb-1.0.0-pre3]# ifconfig
dvb0_0    Link encap:Ethernet  HWaddr 00:D0:D7:04:70:A3  
          inet addr:192.168.238.238  Bcast:192.168.238.255  Mask:255.255.255.0
          UP BROADCAST RUNNING NOARP MULTICAST  MTU:4096  Metric:1
          RX packets:10481 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100 
          RX bytes:3541092 (3.3 Mb)  TX bytes:0 (0.0 b)
          

dvb0_1    Link encap:Ethernet  HWaddr 00:D0:D7:04:70:A3  
          inet addr:192.168.239.239  Bcast:192.168.239.255  Mask:255.255.255.0
          UP BROADCAST RUNNING NOARP MULTICAST  MTU:4096  Metric:1
          RX packets:145780 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100 
          RX bytes:158110950 (150.7 Mb)  TX bytes:0 (0.0 b)
          Base address:0x12c 

dvb0_2    Link encap:Ethernet  HWaddr 00:D0:D7:04:70:A3  
          inet addr:192.168.240.240  Bcast:192.168.240.255  Mask:255.255.255.0
          UP BROADCAST RUNNING NOARP MULTICAST  MTU:4096  Metric:1
          RX packets:49573 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100 
          RX bytes:52569117 (50.1 Mb)  TX bytes:0 (0.0 b)
          Base address:0x1f4

Besides, I am using RedHat 9 and a plain kernel 2.4.21, but I don't think
this makes any difference.

Hope this somehow helps.

Regards,
Holger (Kiehl)



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