Am 16.06.2020 10:48, schrieb Antony Stone:
On Tuesday 16 June 2020 at 08:18:51, Luca Bertoncello wrote:
> sudo tcpdump -i eth0 -s 0 -w /tmp/test0.pcap &
> sudo tcpdump -i eth1 -s 0 -w /tmp/test1.pcap &
eth0 is my DSL interface and eth1 my phone interface?
Well, one is internal (phone) and the other is external (DT), doesn't
matter
which way round.
This was what I meant...
tcpdump -i dsl0 -s 0 -w /tmp/test0.pcap host tel.t-online.de &
tcpdump -i phone0 -s 0 -w /tmp/test1.pcap host 192.168.200.xx (IP of
my
phone) &
Looks like you name your Banana interfaces very similarly to mine :)
I think, we are not alone... :D
However, I would be careful with that first one, containing "host
tel.t-
online.de". I don't use DT, so I can't be sure, but I guess this is
the SIP
server to which you register with the account credentials...
It *may not* be the same machine as handles the RTP packets - that is
negotiated separately between Asterisk (or the Thomson, when it's
connected
directly to DT) as part of the SIP INVITE / Acknowledge.
So, you *could* find that you capture all of the SIP traffic and none
of the RTP
traffic. On the other hand, you might get everything.
You can be pretty sure it's worked if you do the above and then find
that the
two packet capture files are approximately the same size. If the DT
one is
significantly smaller (by which I mean a factor of at least ten
different), then
omit the "host" parameter on that capture and try again...
OK, I'll check it...
Thanks
Luca Bertoncello
(lucab...@lucabert.de)
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