This helps me to see the forest for the trees. And it’s pretty current:

http://upload.wikimedia.org/wikipedia/commons/3/37/Netfilter-packet-flow.svg

Jeff Haran

From: kernelnewbies-bounces@kernelnewbies.org [mailto:kernelnewbies-bounces@kernelnewbies.org] On Behalf Of Anil Joshi
Sent: Tuesday, July 15, 2014 7:38 AM
To: kernelnewbies
Subject: Path of network packet in kernel

Hi All,

I am just new to all this,just wanted to trace the path of the packet since it enter the system(inside the kernel (functions and system calls)) and reaches the destination application.

How to do that.

Regards