Working on nat64 tutorial

docs/book/SUMMARY.md

@@ -1,7 +1,8 @@
 # Summary
 
-- [Introduction](./introduction.md)
-- [Libraries](./libraries.md)
+# Getting Started
+
+- [What is NAT64?](./learning/nat64.md)
 
 # User Guides
 

docs/book/binaries/protomask.md

@@ -1 +1,3 @@
 # `protomask` User Guide
+
+The `protomask` binary is a NAT64 implementation. 

docs/book/introduction.md

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-# Introduction
-
-Protomask is a user space [NAT64](https://en.wikipedia.org/wiki/NAT64) implementation geared towards networks that need fast and reliable inter-protocol packet translation. Behind the scenes, protomask uses the [Universal TUN/TAP Device Driver](https://docs.kernel.org/networking/tuntap.html) to translate incoming packets from IPv4 to IPv6 and vice-versa.
-
-For an overview of the project, see the [website](https://protomask.ewpratten.com) or [GitHub repository](https://github.com/ewpratten/protomask).
-
-## Table of Contents
-
-- [Protomask library suite documentation](./libraries.html)
-- [Using `protomask`](./binaries/protomask.html)
-- [Using `protomask-clat`](./binaries/protomask-clat.html)

docs/book/learning/nat64.md

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+# What is NAT64?
+
+IPv4 and IPv6 are two different versions of the Internet Protocol that, while being similar in many ways, are not directly compatible (largely due to their differing header structure).
+
+
+## Addressing
+
+IPv4 addresses are 32-bit numbers (represented as `xxx.xxx.xxx.xxx`), while IPv6 addresses are 128-bit numbers (represented as `xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx`).
+
+When an IPv4 packet is sent from one host to another, the sender embeds both the sending and receiving address into the packet header (just like a destination and return address on physical mail). This means that a packet traveling from `192.0.2.1` to `192.0.2.2` would be marked as such in the packet header:
+

docs/book/libraries.md

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-# Libraries
-
-The protomask library suite is a collection of libraries that were originally developed for use in the protomask tool suite, but are also quite useful outside of the scope of this project.
-
-These libraries are thoroughly documented in their respective docs.rs crate pages:
-
-- [`easy-tun`: A minimal TUN interface library](https://docs.rs/easy-tun)
-- [`fast-nat`: A library designed for highly efficient mapping and lookup of IP address pairs](https://docs.rs/fast-nat)
-- [`interproto`: A library for translating packets between protocols](https://docs.rs/interproto)
-- [`rfc6052`: A Rust implementation of RFC6052](https://docs.rs/rfc6052)
-- [`rtnl`: A high-level wrapper around `rtnetlink`](https://docs.rs/rtnl)