That is not possible if you use the GSM as a modem since it talks a serial
protocol (rs232/usb), not ethernet. You might need a serial/usb sniffer.

wireshark/tcpdump does "sniff" TCP packets.



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On Tue, Sep 20, 2016 at 6:56 PM, DHC Admin <dhcad...@gmail.com> wrote:

> If you know a tcpdump would do, why don't you use it? On a linux machine
> you would do: tcpdump -w FILENAME.pcap -s 0 host XXX.XXX.XXX.XXX (for
> example) then use wireshark software to read the resulting file from the
> capture.
> Once on wireshark you can search for SMPP params, like phone number.
> hope this helps.
> On Tue, Sep 20, 2016 at 5:38 PM, Manuel García Cabrera <
> mcabr...@contentamobile.com> wrote:
>> I have a SIM inside a GSM modem (Portech mv-374), and I need to see how
>> an incoming SMS packet is formed. A tcpdump would do, but I don't know how
>> to obtain that. Can someone point me in the right direction?

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