Dropping packet from invalid source address

Holger Freyther holger at freyther.de
Thu Oct 6 09:24:27 UTC 2016

> On 06 Oct 2016, at 10:56, Peter Lithner <plithner at yahoo.com> wrote:
> But even if I capture with "-i any" i see only 4 GTP packets: The ECHO Req/Resp and the PDP-C create Req/Resp. The are no GTP encapsulated ICMP/payload messages. 
> I have attached a cap with an example of this.
> Also, like I mentioned, nothing happens if I pause the ggsn with ctrl-z. The ping should have been interrupted by this, I think...
> Not sure what to make of this. It seems I can't get GTP-U to work at all.<gtp4.pcap>

in gtp4.pcap ping is from to so the kernel seems to answer that before it goes to the sgsnemu?


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