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Alex Badea vamposdecampos at gmail.comOn Thu, May 5, 2011 at 5:28 PM, screaming-pain at libero.it <screaming-pain at 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