[linux-dvb] Re: Inet via Sat: tcpdump vs. iptraf

[Johannes Stezenbach <js@convergence.de>]

Thomas Kesselheim wrote:
> Hello,
> I recently encounter mysterious problems when trying to configure an 
> Internet-via-Satellite installation with Debian Woody.
> I have tried linuxtv-1.0.1 as well as linuxtv-1.1.0 with dvbtune and with szap 
> & dvbnet but it is always the same.
> I open the network interface and active it with ifconfig -a dvb0_0 
> 192.168.46.21.
> Next I check the arriving packages with tcpdump -ni dvb0_0:
> 17:30:18.440433 192.168.250.52.44761 > 229.104.117.116.9205:  udp 52 (DF)
> 17:30:18.454868 192.168.250.37.34716 > 229.104.116.128.9205:  udp 1460 (DF)
> 17:30:18.454883 192.168.250.53.49933 > 229.104.117.173.9205:  udp 356 (DF)
> 17:30:18.454906 192.168.250.53.49933 > 229.104.117.173.9205:  udp 1460 (DF)
> 17:30:18.454917 192.168.250.53.47655 > 229.104.117.241.9205:  udp 404 (DF)
> 
> So this seems to work.
> 
> But when checking the same interface with iptraf -d dvb0_0, iptraf says there 
> is no package arriving at all.
> 
> Can you help me? There seems to be some filter activated but I cannot find 
> any.

iptraf does not set promiscous mode by default, and you won't get
multicast traffic unless you setup your multicat routes correctly
and join the multicast group.

Johannes


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