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[linux-dvb] dvb and dvb0_0 network device
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
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