[linux-dvb] dvb and dvb0_0 network device

[dvb@cristalys.com]

 Hi,

 The system i use is :

 ASI card ----->---DVB modulator------->DVB card nexus-s Technotrend 
 
 problem with tcpdump on dvb0_0 .

 I made an MPE encapsulation on my mpeg-2 packets.

 In fact because i'm newbie in mpeg and dvb , i took a little IP packet

( a ping ) of 64 bytes so i could put it in only one mpeg-2 packet of 188 bytes

And i put this Ip packet on a MPE frame with header and CRC32.

And I put this frame in the payload of my mpeg packet.

 
 |--------|---------------------------------|----------------|
 |-HEADER-|- MPE header--IP datagramm-CRC32-|-rest of 0xFF---|
 |--------|---------------------------------|----------------|
 
  <4 Bytes><-----------------------184 Bytes----------------->

MPE configuration : MAC dest = MAC dvb-s card
                    

So i send a lot of MPEG packet with the PID i choose 0x0065 = 101

with a Bitrate of 22.000.000 bps

After the ASI card i have a modulator Newtec L-band with this configuration in

modulator/control :

        -- Baseband interface : ASI-B   ( my input from ASI card )
        -- Interface Bitrate : 22.000.000 bps
        -- FEC-rate : QPSK-3/4
        -- MPEG framing : external
        -- Baseband processing : off
        -- Symbol rate : 15.914.894 baud
        -- Output freq : 1.450.000.000 Hz
        -- Output Level : -41.1 dBm
        -- Carrier mode : on
        -- L-band transmit : enable
        -- ASI switching : manual
        -- Rate priority : interface
        -- spectrum inversion : direct spectrum
        -- ...

 
After the modulator i have a DVB-s card : a PCI Technotrend nexus-s

I installed the card on a redhat 9.0 whith kernek 2.6.5 which have the dvb 
driver

I installed firmware  dvb-ttpci-01.fw 

I use dvbtune ( dvbtune -f 1450000 -s 15914 ) to configure the card

I use dvbstream to capture my PID ( dvbstream -f 1450000 -s 15914 101)

I use dvbsnoop ( dvbsnoop 101 )

And i succeed in capturing my packet .

BUT when i use instead of dvbstream and dvbsnoop the dvbnet application or
simple dvbtune like this :


 dvbtune -f 1450000 -s 15914 -n 101   (to create dvb0_0 network device )
or
 dvbnet -p 101
after configuring the dvb0_0 device I do a tcpdump on dvb0_0 and nothing

If you have an idea ?????!!!!   

      thanks for helping