[linux-dvb] Re: dvb and dvb0_0 network device

[dvb@cristalys.com]

 Hi, Johannes Stezenbach


  I have nothing when i do :    --->  dvbsnoop -n 1 -crc 101

  But i 've seen in the feature list of dvbsnoop on the website :
 
      http://dvbsnoop.sourceforge.net/features.html

  that for the option -crc and -nocrc :

   CRC check  | if supported by hardware, firmware or driver (demux level) 
   
   I have a PCI nexus-s from technotrend

  Do you think that the option -crc could be used in my case.

  If it's right I've got a problem with my crc32 function ....

  Do you know where i can found a dvbsnoop ouput with a full mpe packet and an

 IP datagramm inside. (and a good CRC32)

 
**************************
   THANKS Johannes
**************************




----------------------------------------------------------
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Quoting Johannes Stezenbach <js@convergence.de>:

> On Thu, Jun 10, 2004 at 09:30:36AM +0200, dvb@cristalys.com wrote:
> > 
> >   # dvbsnoop -n 1 101
> > 
> > ----------------------------------------------------------
> > SECT-Packet: 00000001   PID: 101 (0x0065), Length: 80 (0x0050)
> > Time received: Thu 2004-06-10  09:02:20.367
> > ----------------------------------------------------------
> >   0000:  3e b0 4d 7b f1 c1 00 00  20 5c d0 00 45 00 00 40   >.M{....
> \..E..@
> >   0010:  1d 54 00 00 ff 01 89 68  0a 01 00 fe 0a 01 00 01  
> .T.....h........
> >   0020:  08 00 38 8c 03 d5 00 00  00 07 e5 59 00 00 70 fe  
> ..8........Y..p.
> >   0030:  ab cd ab cd ab cd ab cd  ab cd ab cd ab cd ab cd  
> ................
> >   0040:  ab cd ab cd ab cd ab cd  ab cd ab cd 7d 24 f5 0a  
> ............}$..
> 
> 
> Looks good to me. If you still get the same output with
>   # dvbsnoop -n 1 -crc 101
> then the CRC is correct, otherwise you have found your problem.
> 
> 
> > and the ifconfig gave me:
> > 
> > ----------------------------------------------------------------
> > dvb0_0    Lien encap:Ethernet  HWaddr 00:D0:5C:20:F1:7B
> >           inet adr:10.1.0.1  Bcast:10.255.255.255  Masque:255.0.0.0
> >           UP BROADCAST RUNNING NOARP MULTICAST  MTU:4096  Metric:1
> >           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> >           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
> >           collisions:0 lg file transmission:1000
> >           RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
> 
> Either there was no traffic, or the CRC was wrong. (You should run
> tcpdump after configuring the interface to set it into promiscous mode,
> otherwise a wrong MAC address could also be the reason for not seeeing
> any traffic).
> 
> Johannes
> 
> 
>