Dietmar Zlabinger wrote:
Hi,
I am looking for help on receiving DVB-H.
I get to the point where the encapsulated IP is attached to a network
interface (as dvb0_0 using dvbnet -p <portnr>). At this stage I am
able to dump the UDP-packets received using tcpdump. But I am not able
to get that IP-multicast into VLC.
I believe the problem is related to the fact that normally
IP-multicast uses the Ethernet broadcast address (ff:ff...) while in
dvb-h the destination mac is (partly) replaced by the dvb-h time
slicing information . Therefore the traffic is only received by the
network interface when it is in promiscuous mode (when using tcpdump),
but not when a normal program (like vlc) is trying to get multicast
frames out of it.
My idea then was to modify dvbnet so that it replaces the "broken"
ethernet destination (is contains timeslicing-infos) by "ff:ff" so
that it goes through the network interface. But the actual code of
dvbnet does actually not handle the received data, the only thing that
program does is some ioctl(fd_net).
Any idea who I could get the ethernet-multicast out even when the
destination mac is wrong?
Any idea how I could modify (the kernel) so that I could overwrite the
faulty mac?
I could not find any description on how to receive dvb-h on the web.
The are some mailing on how to find SDP files, but that was not such a
big thing (dvbsnoop -b <pid> ..).
Thanks for help,
Dietmar
premitting that I have very little confidence with networking in general...
if you run
$ ifconfig dvb0_0 ip/mask promisc up
$ route add -net 224.0.0.0/4 dev dvb0_0
you shouldn't need to tamper with the MAC addresses.
You can also use smcrouted to re-route the tuple src_ip->dest_ip from
dvb0_0 to eth0
(although I find it annoying having to know the source ip).
I ad dvb-h working in both manners.
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