Linux TCP/IP Stack injection
----------------------------

The PF_RING "stack" module can be used to inject/capture packets to/from the Linux 
TCP/IP Stack, simulating the arrival/sending of those packets from/to an interface. 
The application has to open a ring by using as device name "stack:ethX", where ethX 
is the interface bound to the packets injected into the stack. 
In order to inject a packet to the stack pfring_send() has to be used, in order to 
capture outgoing packets pfring_recv() has to be used.

Example of injecting an ARP into the stack simulating reception from eth0:

 $ echo "ffffffffffff0026444fb191080600010800060400010026444fb191c0a801fe000000000000a9fecbe1" | pfsend -i stack:eth0
