6 May
2011
6 May
'11
9:35 a.m.
On Thu, May 5, 2011 at 5:28 PM, screaming-pain(a)libero.it
<screaming-pain(a)libero.it> wrote:
Hi list,
I know I am very slow in understanding osmocom-bb, anyway this is just a quick
question.
Is it possible that some of the gsmtap messages are getting lost?
For example I can see a LOCATION UPDATE and a LOCATION ACCEPT from the
'mobile' application log but there aren't the corresponding messages in the
wireshark capture,
though this does not always happen, I mean I had captures of location updates
other times, this is why I am wondering if they are getting lost and what it
does depend on.
for what I understood the gsmtap functions utilities are in gsmtap_util.c and
the one to send the messages on the socket is called by l1ctl.c am I right?
Can you help me understanding why I cannot see all the messages?
thank you in advance
Loretta
Hi,
I've had this happen to me when I wasn't receiving the gsmtap packets.
Specifically, I had the gsmtap packets sent over the network (i.e.,
non-localhost). There was no UDP listener on the receiving end, such
that ICMP port-unreachable replies were being sent back. It would
appear that this causes the sender's kernel to snub some of the
outgoing packets. I don't know if the same happens on localhost.
If this is your case, you can try "iptables -I INPUT -p udp -d 4729 -j
DROP", or something like "nc -l -u 4729 > /dev/null".
Cheers,
Alex