Linux---advanced networking overview version 1

All the text in this document is purely based on my understanding of implementation of various features. I have read some documents and I have seen the code myself, and I describe them based on my understanding. If the readers notice any description of a concept which appears contrary to their understanding of the concept, the issue can be taken up for discussion and corrections will be made to the document as necessary. I would appreciate all suggestions and comments made in an attempt to make the quality of this document better.