[linux-dvb] Re: Set up a network interface

[David Vidal Rodríguez <vidalrod@in.tum.de>]

Holger Waechtler wrote:

> Just use e.g. tzap for tuning, everything else should work as above. On 
> the wen you also find some HOWTOs which describe how to set up a network 
> connection over DVB.
In order to use tzap I have to generate a channel list with the scan 
program, isn't it? Well, I get the following output:


# dvbtune -c 0 -f 650000000 -tm 8 -qam 16 -cr 2_3 -gi 8 -bw 8 -n 16978
Using DVB card "TechnoTrend/Hauppauge DEC-2000-t Frontend"
tuning DVB-T (in United Kingdom) to 650000000 Hz
polling....
Getting frontend event
FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI 
FE_HAS_SYNC
Bit error rate: 0
Signal strength: 255
SNR: 0
FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI 
FE_HAS_SYNC
Successfully opened network device, please configure the dvb interface

# scan
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'

>>> tune to:
658000000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_NONE:QAM_16:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_8:HIERARCHY_NONE

Frontend can not do requested INVERSION_AUTO, trying INVERSION_OFF instead
>>> tuning status == 0x1f!!!
start filter pid 0x0000 table_id 0x00
start filter pid 0x0011 table_id 0x42
start filter pid 0x0010 table_id 0x40
filter timeout pid 0x0011
remove filter pid 0x0011
filter timeout pid 0x0000
remove filter pid 0x0000
filter timeout pid 0x0010
remove filter pid 0x0010
dumping lists (0 services)
Done.

...which leads me to think that there is still something wrong there. 
First of all, that "658000000" number, or the "Signal strength: 255" 
line from the dvbtune command.

It is proven that I receive the DVB-T signal because I can watch TV with 
the same dec.

Let's go on:

# ifconfig dvb0_0
dvb0_0    Link encap:Ethernet  HWaddr 00:00:00:00:00:00
          BROADCAST 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 txqueuelen:100
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
          Base address:0x4252

# ifconfig dvb0_0 hw ether 11:12:13:14:15:16
# ifconfig dvb0_0 192.168.0.1
# ifconfig dvb0_0 promisc
# ifconfig dvb0_0
dvb0_0    Link encap:Ethernet  HWaddr 11:12:13:14:15:16
          inet addr:192.168.0.1  Bcast:192.168.0.255  Mask:255.255.255.0
          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 txqueuelen:100
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
          Base address:0x4252

Neither iptraf nor tcpdump show activity of any class in dvb0_0. Luckily 
I don't get panics any more, or at least I can't reproduce such a situation.

I'm using (in this order) dvb-core, dvb-ttusb-dec, and dec2000_frontend.

What's going on here?
Thanks!
David.




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