Dropping packet from invalid source address

Holger Freyther holger at freyther.de
Wed Oct 5 14:29:21 UTC 2016


> On 05 Oct 2016, at 11:46, Peter Lithner <plithner at yahoo.com> wrote:
> 
> Hi
> 

Hey!


> However, I can't see that a network interface is created after the PDP-C has been accepted. According to the README on https://github.com/osmobuntu/openggsn that should happen:
> "After this it will attempt to establish a pdp
> context. If successful it will create a local interface and set up
> routing."

we can't control what is written about our software. The tun interface will be created when the GGSN is starting. You can then add routing/masquerading and forwarding for that interface.



> Received echo response
> Received create PDP context response. IP address: 192.168.0.2
> Dropping packet from invalid source address: 0.0.0.0
> Dropping packet from invalid source address: 0.0.0.0
> Dropping packet from invalid source address: 0.0.0.0
> Dropping packet from invalid source address: 10.7.0.240
> Dropping packet from invalid source address: 10.7.0.240
> Dropping packet from invalid source address: 0.0.0.0
> Dropping packet from invalid source address: 10.7.0.240
> Dropping packet from invalid source address: 0.0.0.0
> Dropping packet from invalid source address: 10.7.0.240
> Dropping packet from invalid source address: 10.7.0.240
> Dropping packet from invalid source address: 0.0.0.0
> Dropping packet from invalid source address: 10.7.0.240
> Dropping packet from invalid source address: 0.0.0.0
> Dropping packet from invalid source address: 10.7.0.240
> Disconnecting PDP context #0
> Received delete PDP context response. Cause value: 128
> 
> Where 10.7.0.240 is the ip address of eth0
> 
> Once again, if you have any suggestions, I'm all ears! Thanks in advance!


that is fun. So the tunnel was created correctly but then other parts happened. Could you run tcpdump/wireshark on tun0 and see what is being sent there?

holger


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